Yep that bike was revving 9k rpm the whole time but I’m guessing there was no oil in it cause normally these cbrs take that kind of abuse without issues
Be proud man. Regardless of what happened, your reaction was good and you manage to stop safely and with no injures. She gave everything she had, she will be missed.
Rip that little warrior, he did great. On a side note, I love how when you got off the bike and squatted down to look below it looks like a videogame by the way you had your hands in the air just hanging lol
Brilliantly handled. Under pressure. Remained calm. Didn't forget the safety critical parts of keeping yourself and everyone else safe, while controlling the bike to a safe spot. I don't know much about bike engines but there was definitely a failure with a bearing or rod ends ...sounds like something a good mechanic would tell me while I nod with approval. All the best fella.
You handled this awesomely. This could have ended a lot different and tragically had you not kept your cool, nice job mate EDIT: Many repliers here would rather be keyboard warriors than out riding. Thanks for the replies; keep the sticky side down
I mean i guess. Lossing power is probably the least dangerous thing that can go wrong if you ask me 😅. Sure ya gotta get over but you can still stop, steer and coast/push. Now locking something up, that will leave a brown stain in your undies 💩
@@GradenGmoney44 lmao ikr, it's not like he had a death wobble or whatever, he just lost power. Still I mean that's the most common reaction is to pull over because in scenarios like this, he wouldn't even panic cuz he doesn't know what happened lol
Good job not panicking and getting to a safe spot on the side of the road. I think the crash did a great job preparing you for the bike blowing up. You didn't seem anywhere near as upset. It sucks you're limited to a 125cc right now. That poor thing is near the red line the whole time you're on the highway. I wonder if that had anything to do with the engine blowing up? Btw, the engine oil will always look low when the bike is on its kickstand. To check the level the bike needs to be on a level surface and you'll need to pick the bike up off the stand so it's straight up and down, like when you're riding.
Thanks for the support! Indeed this reaction was way better then when I crashed on that roundabout. Oil level was good. I always do maintenance with the manual next to me. I’ve bought an occasion engine and swapped some parts out. Still waiting on some new parts before putting her back together. And than hoping she’ll start up without any problems. From now on, no more highway when on a 125 😄
They really aren't meant to do a solid 140kmh on the highway. I have an 07 plate with a bunch of mods and I've had it running into the redline (11,500rpm) for over 4 hours straight. It was cold out (1 degree Celsius) so that's what saved it from getting to hot and blowing up. Watched my fuel guage go down fast at the rpm range though.
i have 200 cc and i ride on the right side of the highway and let my scooted chill not fast ! i dont have enought power to overtake cars! i have joyride 200
Props to you for thinking fast and staying calm, honestly I was thinking you were gonna stop on the left and just wait there till I realized you were just being safe haha. Good job man!
you handled the power loss so well ... I couldnt have done better. A Honda engine with proper oil and tune should easily sustain the rpm you were showing there. Unless perhaps it was already suffering from low compression or lean mixture - then it might get hot - and fail. Honda 90cc and 125cc engines are normally reliable as a hammer.
@@Anon.G that's a myth four stroke tech has surpassed them . Example NSR 500 max rpm 12,500 cbr 600rr 16,000 shim it down to 500 it will lap the 2 stroke all day and the two stroke will blow up chasing it.
The con rod broke?! That's insane! Surely this engine had been rebuilt/tampered with by a previous owner?! I'm pretty far from a Honda fan boy but there's no way in hell they'd release an engine that bad
@@wooweetbix9412 Every 125 is always going hard every day which is why so many of them blow up fairly early. Simply due to gearing they are conatantly at high RPM which is bad especially in cold conditions.
Once happened to me 4 month ago. While I was riding my yamaha 150cc around 130kph on the way to work, the engine gets noisier and the engine just shuts off. The engine got no compression but can still be cranked. The valve hits the piston and the valve crooked. Just a bit dent on the piston. The cause was, the earlier mechanic put the valve springs upside down. So the yamaha mechanic assembled the head again and changed the valve. The bike runs strong again. 11 year old bike and the odometer fully counted twice. My daily commute to work. 90 km a day travel
The way you handled that was superb. However, it does show that although small displacement bikes are cool (figuratively in this case), larger displacement bike have their place.
@@228Ghost228 Yes, I forgot about mentioned low HP. A large low end torque producing low output under-stressed engine will last the longest. I have an LS430 that fits that characteristic. It's a 4.3l V8 that makes 290 HP.
The strange sound suggests that the timing chain tenstioner probably failed and allowed to much slag on the chain, leading to it slipping over the teeth. Its also important to keep the cooling systems on these small high reving engines clean and operational, as there is not much water mass to take up exess heat. Overheating the engine can either warp the head and blow a head gasket or lead to a seized piston. One should also keep the air-fuel mixture of carburated engines at an optimal level as a lean running engines runs hotter at the surface of the piston, ive even had cases where there was a clean hole melted straight through the piston.
I’ll think about it! But for the next couple of weeks there won’t be much happening on this channel. 😅 Tomorrow I’ll upload a pre-recorded ride. Thanks for the support!
Definitely a lot of strain on a 125, but even so I'm a little surprised to see a Honda engine fail this way (not that I know anything about the engine in this bike). I've always thought of small Honda engines as being designed for a life of nothing but pure torture beyond what any sane or reasonable person would subject it to 😄
Yeah. it's not super regular you see a small Honda engine go boom. they're extremely bulletproof engines. Essentially the Toyota 2JZ-GTE of motorcycles. that said though, consistently running an engine at or near redline for extended periods, regardless of how much you service it, is gonna take a toll on the internals eventually.
It should not blow up even near redline for an extended period of time. 120kph for a 125cc is not an extreme riding speed, especially for a Honda (probably manufactured in India, even, no problem). Now, is everything maintained properly? Valve clearance? Engine oil quality and quantity? Cooling features clean and effective? I bet something was already wrong, and high engine speed made this problem cause overheating which resulted in mechanical malfunction on the stressed part of the whole problematic system
@@Orakwan One also has to wonder about the oils used in the engine as well, and how many miles they had on it, as the age of the engine oil can have an impact on the engine's reliability at high revs if it's got a lot of running hours on it.
At our courier company we used a Honda Varadero 125 as a spare bike and it was pushed along at 70mph max but never for more than maybe 30 minutes as I wouldn't like to use them for hours like that. Sounds absolutely like oil starvation which happens easily if your pushing these small hikes hard but don't be surprised as I used to service a couple of our Honda CG125's in the old days and a litre of oil didn't last long! Varadero oil ( 1.2 litres) was checked and topped daily and after 94,000 miles the only problems were a reg/rec failure and the clutch control switch which was underneath the bike. Knocked it off going down some steps 🤯 and the bike conked out when you released the clutch lever. Lovely little bikes but expensive for what they were.
Brings back bad memories although for me it was my reg/rec dying on my CB400SF, setting the CDI on fire as well as it went out, was 200km away from home and spent around 2-3 hours on the side of a busy motorway trying to figure out what was up before calling the insurance company to get her towed away Surprised the 125 blew on you, it uses the same engine as the cbf and they're supposed to be able to take tons of abuse as it's fairly simple and made for commuters
Yeah but depends on how much you are doing it, Honda's are beasts, especially if you look after em, if you are red lining the thing all the time, it will eventually blow
That's the reason I want at least a 250/300 when I start riding one day. The few more horse powers make a huge difference both on highways and overtaking safely.
That strange sound close to the end is a classic case of oil starvation with the connecting rod bearings. The unnatural sound is caused by the bearing surfaces touching, which only happens with insufficient oil pressure. There are a multitude of reasons as to why this could have happened; could be something went wrong with the oil pump, debris got caught in the crank shaft oil ports, the oil overheated from insufficient heat transfer/dissipation (not sure if this bike has an oil cooler)... overheating of the oil causes a reduction in viscosity and film strength. It is extremely important for an oil to maintain it's labeled viscosity under demanding conditions, as it ensures the proper oil pressure between the exacting bearing surface tolerances. Whatever the cause may have been, I'd be interested to know what the prognosis was.
Hi there, thanks for the information! I took apart the engine, the con rod was broken in half, the piston was shredded, a valve was missing, the other valve was damaged. The spark plug was damaged and there was a tiny hole in the engine cover underneath the con rod. I don’t know what failed first. Some think it was the con rod breaking, some think it was the cam chain tensioner failing. I used 15W40 oil because a mechanic told me to due to the long highway runs I have to make. I did a few 3-4 hour runs with 15W40 oil and it didn’t fail me then. This was just a 30 min ride from school when it happend. The bike had been serviced a few weeks prior. So I don’t really know what caused this, but probably the manny highway runs I did on it.
@@ROWHAWK I know exactly what caused your con rod, piston, and 1 valve to be obliterated. 2 plausible occurrences. The oil went beyond maximum operating temperature... losing it's viscosity and shear strength. Orrr, the thicker oil obtained what's known as cavitation. Essentially, cavitation occurs when tiny air bubbles accumulate in the oil at high RPMs, and because of the increased viscosity of the 15W-40 oil, the bubbles cannot surface quick enough. Therefore, the bubbles travel with the flow of the oil, then traveling to your con rod bearings and causing a lack of pressure between the surfaces. Here is the process of destruction that ensued within your engine... The con rod bearing wore down & seized, the valve to piston clearance was reduced... your piston hit your open valve on the exhaust stroke, the sudden reduction of piston travel caused your con rod to snap while still on the exhaust stroke, a chunk of metal from your piston or con rod flew down out of the cylinder like a medieval cannon and punched a hole through your oil pan. That cover beneath your con rods is known as the oil pan BTW.
@@jashnn2805 Buy a bike that has an engine capable of that kind of abuse. It's that simple. Preferably something with a good oil cooler. And, use the correct oil viscosity.
Ive been riding for 7 year and I can say I wouldnt have handled that situation any differently. Good reactions and solid decisions, ride like that and youll ride your whole life.
@@dietznutz1 wrong overdrive with either manual or auto transmission are the highest gear in automatic situations the ecu chooses the best gear for that to keep rpm low in manual situation it’s the human selecting and at highway speeds depending on if you have 5/6 gears sometimes more
My Honda 125 blew up doing the same. Long (like 20 mile) rides at high RPM keeping up with motorway traffic then exactly the same plop, gone, piston scored to fuck and Honda wanted £3,000 to replace the engine on a £1,500 bike, did it myself for £300. They only have a 1L oil capacity and when doing high revs they absolute guzzle oil, piston probably seized and threw a rod. I won't be doing motorway miles on 125s anymore though, they're clearly not designed for it, Honda claimed "excessive use" when I tried to warranty it.
You'd be surprised. Seen lots of sub-250cc bikes, ride highway speeds all day every day for decades. 150's I have seen exceeding 140+kph all day long no worries, every day.
@@danial1519 Works in most countries. I'm currently in US, but Asia/Europe seems to be the place for the hot little pocket rockets. I fondly remember chasing a HJ125 (Suzuki GN125 for rest of world) ringing its guts out in Shanghai. In terms of what I have personally ridden under 250cc; GN125, TS185, T125, RG125, RG150 (these are amazing!), FXR150, KR150, Aprilla RS125....and probably others i am not remembering. Looking "Bucket Racing" as its great racing class for oddball small bikes. Also the 125 and 150 race classes. Lot's of fun.
allright i found 2 things that i personally do in your video and had to point them out: 1: i give my (cheap) bike the "you're doing good" pat. 2: i have a teddy bear on the bike sitting exactly like your's :)
Personally I think it’s the crazy top/cruising speed these little 125cc engines are capable of doing. People forget that just because it’s been made to do it doesn’t mean it’s good for it. Too highly strung to last. I’ve had 500cc bikes that couldn’t go any faster than that, but they would, with regular services/oil changes go twice around the clock. Normally highly strung engines don’t last to long when pushed hard and long. Of course there will be exemptions to that. Hope it’s not done too much.
Oh yeah, this brings me back. I used to own a 125cc Taiwanese twist and go scooter that was honestly meant for schoolgirls doing in town runs to the mall. I rode that sucker on day rides from Montreal down into New England. I eventually blew the engine up in New Hamshire in the Presidential Range coming back from Maine. I assume the garage I left it with parted it out.
I owned one of those first ever motorcycle 120kmh on that bike is putting slot of stress on the engine especially if your constantly on the throttle they're very small bikes not meant for particularly highway riding idk how it is in your country might be different. Ps she's clean looks very well looked after 👌
I had a problem like this before but it wasn't the engine. I was riding back home and just like you, for once, I am just relaxing up until my lights and speedometer died. Couldn't even signal so I used hand to signal to the shoulder. Turns out one of my fuses blew up and thankfully I had a spare fuse. Fixed it up and rode home. Turns out, the wiring for my high beam and low beam light was exposed and it made contact.
LOL, the first bike I had was a 1972 Honda CL450. On my first ride down Summit Mountain a touch of the brake pedal turned the engine into an air compressor! It blew "the fuse", as there was only one, but I'd had the foresight to bring spares and electrical tape and a leatherman tool.
These engines aren't usually prone to any issues. I owned the 150 version out here in Asia with a high mileage. Had no problems as long as you keep up the oil change intervals.
Usually when engines go out they like to sieze and buck you, not sure how common it would be on a 125 but considering your engine went thru loads of stress before it went out leads me to believe you lost compression and the engine died.
On an empty road i usually cruise around 70-110KM/h on my cbr150 and the engine feels pretty hot, can't imagine the heat from that 125 when you cruise on that speed for a long time..
Had the same issue with mit jc39, it was the 'pin' wich holds the conrod and the piston together. In my case, I cleaned the engine from all the metal pieces and bought a new pin. 12,50€. After that it ran again :) Someone told me, that the jc39 is known for this problem... I hope you are lucky as well ;)
I know the bike had 9.000 km when I bought it. Now has 22.000 km. I did multiple trips to the Netherlands with +/- 350 km (single trip) over the highway going 130 km/h. (Once a month) Never had a problem. Always did service on time. When my school year started I traveled +/- 35 km highway (120 km/h) to school and back home on the daily. One of those trips the engine decided to blow. It’s fixed and I’m going to school on normal roads now. And only twice a week. No more highway till I have an A2 licence.
That’s what I’m thinking. People told that a 125 doesn’t like highway because of the high rpm’s. And I rode it on the highway to university almost every day. So that’s probably why.
@@ROWHAWK makes sense, i was pretty shocked to see you do these videos on the highway. also, when you will be able to, whats the next motorcycle you're gonna be getting after the cb125?
Thank you, I already have the Vulcan. My grandma gave it to me. It was her bike but she doesn’t ride no more. Otherwise I would have got a CBR 600. Maybe if I get my full license (A) I’ll get a racer 😁
@@FarrFromPerfect I had a 150cc Chinese scooter I just scrapped last week, took it on the highway every day, no problems . scrapped it because everything else failed but the engine was still good at 20k
I had the engine of a Repsol CBR 125R explode whilst riding country roads, still to this day not exactly sure what happened but the inside of the engine was completely mangled, not economical to repair. Had to source a complete replacement engine for it. Anyway you handled it well considering the situation, I was lucky in so far as I was the only person on the road but having something like that happen on a busy highway is something different entirely.
@@FarrFromPerfect so many people here without any knowledge. 125 engines are pretty much indestructible, just need to have oil in the engine... Traveling like this is completely fine, my old 125cc 4 stroke supermoto revved up to 10,500rpm. 9k is no problem
Could be the case. Another thing that could be the problem is that my family lives in The Netherlands and I moved to Belgium. Twice a month I did 4 hours trips to the Netherlands (At least 2,5 hours highway) and I always pushes it to the limits. (Laying flat on the bike to reach 140). So I won’t do that no more till I have another licence and a bigger bike.
I’m 1,80 meters and it sucks. The bike is to small for me. It is not that big of a problem. But even taller? No. I wouldn’t recommend it for you. Maybe something like an Afrika twin?
Bought it at 9,000 km, after a year of riding it’s at 21,000 km. Even though it’s a fun bike for in the city, I can’t wait till I’m allowed to ride a bigger bike.
People think because engines are small they can take being ran flat out all the time and they can for a bit but if you want a engine to last try and stay around half the red line when cruising long distance. Staying up near the red line will blow them early! Good oil is a must!
Could still be low oil due to consumption at high speeds. The CBR250R and 300R have had failures due to their long service interval and owners not checking oil level.
I think it's not just the head gasket! I heard some clunky metal sounds! It's gonna be expensive! That's why, In India, We don't even cross 90 KMPH on a 125 CC (Even if the bike can go much faster). It's gonna blow something up! If you wanna be faster than that, you should maybe invest in a higher displacement engine. 300cc is a good start. There is no replacement for displacement. Get a bigger displacement and ride at cruising speeds. The engine stays healthy! A short story, I once did 200 kms on a Hero-Honda 100CC bike in one single sitting! Constantly kept the speed at 60-70 KMPH! (Speeds are slower in India) and the bike was very happy to do more! I Still have the bike and about to reach total lifespan validity! Nicely handled it! It was dangerous! Glad you're okay!
Had similar happen recently, yours looks alot better so hopefully by this time you back up and on 2. I sent a rod through and now have an entire chunk of my block missing 😅 Glad your good brotha, 1 down the rest is up from there
my rc125 did like the same thing so i tried to start it with giving a little bit of gas and then it turned on i have a inspection in a few days so they will check if anything is wrong
Had the same bike 2 years ago, exact same colors, i was heading a nearby city, suddenly the engine stops on the middle of the highway. I couldnt start it back and went back home on a truck. I disassembled the engine at home and the exhaust valve was kissing the piston, a total mess. The poor CBR ended on a scrapyard.🥺
Close to redline most the time is sometimes hard, but you may actually be alright if it’s under factory warranty still as it was a failure of normal processes of riding
Aww that sucks. Little 125s aren't meant for full throttle for too long a time. Ive had a break down too. Caught a nail in my rear tire. Both tires have tubes so i had no chance of a roadside repair.
I'd be surprised if this has anything to do with it being a 125cc, I had both the older two stroke Cagiva Mito 125 and Aprilia RS 125 + 4 stroke 125 Cruiser and 125 Moped and none of them blew engines like that. Those old 2 strokes are mental, push out more than twice the BHP of the CBR and I suspect at considerably higher RPM's. That's not to say the Mito and RS125 are reliable, far from it, you break anything on those bikes (and you will) you'll be in tears when you see the bill. I think you've just had a bit of bad luck honestly, hope you're back on the road again soon. Stay safe out there.
My brother's BMW K1200S recently blew up while driving 200 kmh on the highway.. The connection rod broke and busted the engine casing, oil all over the rear tire, but luckily he didn't crash
How many ks were on it when you got it? Any previous irresponsible owners? I have an 06 CBR125, do the maintenance properly, getting my A2 soon and need it to hold out for me for the remaining month or two
I bought it at 9k km on it. It was good maintained and had no issues. Hondas are known for their relatability, so you shouldn’t be to worried about your engine dying on you. I just had some bad luck I guess. Good luck with your A2 license! It’s a lot more fun. Ride safe! 🏍 💨
125’s are actually a great lesson in how engines are designed and tuned because they’re all the same capacity and you will find their limits on a normal road ride. For example the grom revs low for a bike and has a narrow, long stroke - good efficiency but only makes 9hp. So a grom tops out well before 60mph for most people. A sport bike like this have wider pistons and a shorter stroke so can rev higher and respond faster. They’re not as fuel efficient but make much more peak power. I rode a gsx-r125 and got it to an indicated 82, I’m sure a lighter person could get it even higher. Of course usual trade off - the grom’s peak torque is lower down the revs too, and it has little wheels so it’s got a lot of low speed power, making it more fun at lower speeds, whereas these bikes make their power and torque higher up so the feel even more gutless at low speeds, even for a 125. A lot of naked bikes like the cb125f (to keep it in the family) balance the two with squarer engine strokes and middling power (often around 11/12) to get good efficiency, and good enough low speed and higher speed (for a 125) performance, usually capping out somewhere around 65 or so.
Dude at 1:13 you trying to catch a pokemon? XDD it made me laugh so much your position it made me laugh so much your position
Yea, I heard something odd near the engine, I figured it should be somewhere hidden around there. I searched everything. Never found him though.
Hahaha brilliant!!
@@ROWHAWK BHAHHAHAHAHHA
125cc and highway runs are definitely a bad mix. Unless, you like bad mixes then, great job.
Salute
He went full crab there for a second.
I can imagine that sustaining highway speed would put a lot of stress in a 125cc engine.
that's why small displacement isn't allowed on highway in the philippines
Exactly what happened these bikes top out at 80mph and he was going like 70-75 for a long period of time.
Yep that bike was revving 9k rpm the whole time but I’m guessing there was no oil in it cause normally these cbrs take that kind of abuse without issues
Had the same thought 😎👍❤️
@@strryle125 My honda CB 125 R is also at 9K rpm or even 10k rpm on the highway just fine. They are designed to do this.
Be proud man. Regardless of what happened, your reaction was good and you manage to stop safely and with no injures. She gave everything she had, she will be missed.
He should be proud he actually managed to blow the engine up cbr 125 engine are bullet proof !
@@jimmyboimazarti1234 that is because he used wrong oil xDDD
Good job handling that, dude. 👍🏻 Great reaction time if this is your first time ever having something like that happen.
It’s the motorcycle legend himself!!
My mans looks like he's straight out of skyrim the way he's crouching lmao 1:13
Cruising at 75 is a bit too fast for a little 125 engine. 60 - 65 is a better speed, your engine will last longer.
you could easily get 100 out of an 125cc engine so 75 really isn't that much, it really should last.
@@mikokalliomaki3093 False. Most stock 125s top out at 80mph.
@@Matti.K i think he meant 100km/h, no way an 125 going 160km/h tho... (100mph)
@@if_Alex unless its a 2 stroke
He was going at only like 8k rpm this was an engine failure
Rip that little warrior, he did great.
On a side note, I love how when you got off the bike and squatted down to look below it looks like a videogame by the way you had your hands in the air just hanging lol
Brilliantly handled. Under pressure. Remained calm. Didn't forget the safety critical parts of keeping yourself and everyone else safe, while controlling the bike to a safe spot. I don't know much about bike engines but there was definitely a failure with a bearing or rod ends ...sounds like something a good mechanic would tell me while I nod with approval. All the best fella.
You handled this awesomely. This could have ended a lot different and tragically had you not kept your cool, nice job mate
EDIT: Many repliers here would rather be keyboard warriors than out riding. Thanks for the replies; keep the sticky side down
I mean i guess. Lossing power is probably the least dangerous thing that can go wrong if you ask me 😅. Sure ya gotta get over but you can still stop, steer and coast/push. Now locking something up, that will leave a brown stain in your undies 💩
@@81brassglass79 stop, steer coast/push on a highway? that seems like death
How could this have ended tragically
How? He just kiss acceleration
@@GradenGmoney44 lmao ikr, it's not like he had a death wobble or whatever, he just lost power. Still I mean that's the most common reaction is to pull over because in scenarios like this, he wouldn't even panic cuz he doesn't know what happened lol
Good job not panicking and getting to a safe spot on the side of the road. I think the crash did a great job preparing you for the bike blowing up. You didn't seem anywhere near as upset. It sucks you're limited to a 125cc right now. That poor thing is near the red line the whole time you're on the highway. I wonder if that had anything to do with the engine blowing up?
Btw, the engine oil will always look low when the bike is on its kickstand. To check the level the bike needs to be on a level surface and you'll need to pick the bike up off the stand so it's straight up and down, like when you're riding.
Thanks for the support!
Indeed this reaction was way better then when I crashed on that roundabout.
Oil level was good. I always do maintenance with the manual next to me.
I’ve bought an occasion engine and swapped some parts out. Still waiting on some new parts before putting her back together.
And than hoping she’ll start up without any problems.
From now on, no more highway when on a 125 😄
They really aren't meant to do a solid 140kmh on the highway. I have an 07 plate with a bunch of mods and I've had it running into the redline (11,500rpm) for over 4 hours straight. It was cold out (1 degree Celsius) so that's what saved it from getting to hot and blowing up. Watched my fuel guage go down fast at the rpm range though.
i have 200 cc and i ride on the right side of the highway and let my scooted chill not fast ! i dont have enought power to overtake cars! i have joyride 200
@@ROWHAWK you should put a bigger head on it to give more ccs
Props to you for thinking fast and staying calm, honestly I was thinking you were gonna stop on the left and just wait there till I realized you were just being safe haha. Good job man!
o
“only going 75mph”, that’s its top top end, i’m actually impressed a 125cc can hit 75… Nice job on being safe! 👍🏼
you handled the power loss so well ... I couldnt have done better. A Honda engine with proper oil and tune should easily sustain the rpm you were showing there. Unless perhaps it was already suffering from low compression or lean mixture - then it might get hot - and fail. Honda 90cc and 125cc engines are normally reliable as a hammer.
World has changed… i had my first bike in 1992 :
HONDA NSR 125r
Two strokes
Monocylinder
170kmh
Never an issue!!
Old times…
The ran out of fuel and oil at the same time.
Well no shit a 2 stroke is gonna have way more power at the same displacement
@@Anon.G that's a myth four stroke tech has surpassed them . Example NSR 500 max rpm 12,500 cbr 600rr 16,000 shim it down to 500 it will lap the 2 stroke all day and the two stroke will blow up chasing it.
Same thing happened to me earlier today actually, I lost the rear a little but got it under control. You reacted very well mate!
Threw a rod eh?
"same thing"????
The con rod broke?! That's insane! Surely this engine had been rebuilt/tampered with by a previous owner?! I'm pretty far from a Honda fan boy but there's no way in hell they'd release an engine that bad
Lmao, look on the internet 2008/2010 Fireblade.
Crankshaft problems.
Yes mine had it also
Poor little 125 was going hard every second of its life probably
@@wooweetbix9412 Every 125 is always going hard every day which is why so many of them blow up fairly early. Simply due to gearing they are conatantly at high RPM which is bad especially in cold conditions.
@@alexwithanx i have a yamaha mt 125 (125cc 4t lc minarelli engine) with 37000 km and its still going strong. Bulletproof engine
@@giovanniquargentan6198 My XTR 125 2005 with 100 000 km is stil kiiling it (I always keep the engine RPM below 7k rpm)
Once happened to me 4 month ago. While I was riding my yamaha 150cc around 130kph on the way to work, the engine gets noisier and the engine just shuts off. The engine got no compression but can still be cranked. The valve hits the piston and the valve crooked. Just a bit dent on the piston. The cause was, the earlier mechanic put the valve springs upside down. So the yamaha mechanic assembled the head again and changed the valve. The bike runs strong again. 11 year old bike and the odometer fully counted twice. My daily commute to work. 90 km a day travel
The way you handled that was superb. However, it does show that although small displacement bikes are cool (figuratively in this case), larger displacement bike have their place.
In general, the larger the displacement the more durable, even applies to cars. Many large engines with life spans that go beyond a million km.
@@SI0AX high displacement, low horsepower gets you longevity
@@228Ghost228 Yes, I forgot about mentioned low HP. A large low end torque producing low output under-stressed engine will last the longest.
I have an LS430 that fits that characteristic. It's a 4.3l V8 that makes 290 HP.
@@SI0AX That’s exactly why (larger displacement) Diesel engines last so long. High torque at low rpm and they also have low rpm redlines.
@JD Turner Good point!
The strange sound suggests that the timing chain tenstioner probably failed and allowed to much slag on the chain, leading to it slipping over the teeth.
Its also important to keep the cooling systems on these small high reving engines clean and operational, as there is not much water mass to take up exess heat. Overheating the engine can either warp the head and blow a head gasket or lead to a seized piston.
One should also keep the air-fuel mixture of carburated engines at an optimal level as a lean running engines runs hotter at the surface of the piston, ive even had cases where there was a clean hole melted straight through the piston.
This is a super education video. You did a great job reacting to the situation on the road, ride safe bro
Have you considered doing motovlogs? I would love to hear some stories from you. And I hope that bike will be alright and the repair wont cost so much
I’ll think about it!
But for the next couple of weeks there won’t be much happening on this channel. 😅
Tomorrow I’ll upload a pre-recorded ride.
Thanks for the support!
You’re lucky your rear wheel didn’t lock up or anything that would have been a disaster for most riders!
He pulled his clutch in. This man have probably got the fastest reaction speed I have ever seen. Or maybe its the adrenaline kicking in.
Bless TH-cam's algorithm. Some guy blowing up his bicycle on the highway at 120km/h has completely distracted me from studying...
Doing a rebuild on my GSXR 1000 K6 rn you got this! I need to do a whole tear down I have cracked pistons!!!! 🤯
Definitely a lot of strain on a 125, but even so I'm a little surprised to see a Honda engine fail this way (not that I know anything about the engine in this bike). I've always thought of small Honda engines as being designed for a life of nothing but pure torture beyond what any sane or reasonable person would subject it to 😄
Yeah. it's not super regular you see a small Honda engine go boom. they're extremely bulletproof engines. Essentially the Toyota 2JZ-GTE of motorcycles. that said though, consistently running an engine at or near redline for extended periods, regardless of how much you service it, is gonna take a toll on the internals eventually.
It should not blow up even near redline for an extended period of time. 120kph for a 125cc is not an extreme riding speed, especially for a Honda (probably manufactured in India, even, no problem). Now, is everything maintained properly? Valve clearance? Engine oil quality and quantity? Cooling features clean and effective? I bet something was already wrong, and high engine speed made this problem cause overheating which resulted in mechanical malfunction on the stressed part of the whole problematic system
@@Orakwan One also has to wonder about the oils used in the engine as well, and how many miles they had on it, as the age of the engine oil can have an impact on the engine's reliability at high revs if it's got a lot of running hours on it.
At our courier company we used a Honda Varadero 125 as a spare bike and it was pushed along at 70mph max but never for more than maybe 30 minutes as I wouldn't like to use them for hours like that.
Sounds absolutely like oil starvation which happens easily if your pushing these small hikes hard but don't be surprised as I used to service a couple of our Honda CG125's in the old days and a litre of oil didn't last long!
Varadero oil ( 1.2 litres) was checked and topped daily and after 94,000 miles the only problems were a reg/rec failure and the clutch control switch which was underneath the bike. Knocked it off going down some steps 🤯 and the bike conked out when you released the clutch lever.
Lovely little bikes but expensive for what they were.
Brings back bad memories although for me it was my reg/rec dying on my CB400SF, setting the CDI on fire as well as it went out, was 200km away from home and spent around 2-3 hours on the side of a busy motorway trying to figure out what was up before calling the insurance company to get her towed away
Surprised the 125 blew on you, it uses the same engine as the cbf and they're supposed to be able to take tons of abuse as it's fairly simple and made for commuters
Yeah but depends on how much you are doing it, Honda's are beasts, especially if you look after em, if you are red lining the thing all the time, it will eventually blow
@@reposter6434 True although with 125's you're always redlining them on highways and even then you're still under the speedlimit
An awesome rider pushes the machine to its limit and knows where that limit is.
That's the reason I want at least a 250/300 when I start riding one day. The few more horse powers make a huge difference both on highways and overtaking safely.
In some countries you can make a 125ccm licence when you are 16 and a propper licence when 18
So maybe thats why he only has a 125
Belgium law:
18-20 years = restricted to 125 cc, and
@@ROWHAWK In Bulgaria age of 16-18 125 cc, 18+ 35 kW and 21 anything
@@atem8101 I'm 21 and now even 600cc feels too tame :D I don't know how I would be able to ride 125cc.
My sv650 has 75 and it’s awesome…
Great reaction to pull the clutch in instantly, Def saved you a nasty choppy deceleration
That strange sound close to the end is a classic case of oil starvation with the connecting rod bearings. The unnatural sound is caused by the bearing surfaces touching, which only happens with insufficient oil pressure.
There are a multitude of reasons as to why this could have happened; could be something went wrong with the oil pump, debris got caught in the crank shaft oil ports, the oil overheated from insufficient heat transfer/dissipation (not sure if this bike has an oil cooler)... overheating of the oil causes a reduction in viscosity and film strength. It is extremely important for an oil to maintain it's labeled viscosity under demanding conditions, as it ensures the proper oil pressure between the exacting bearing surface tolerances.
Whatever the cause may have been, I'd be interested to know what the prognosis was.
Hi there, thanks for the information!
I took apart the engine, the con rod was broken in half, the piston was shredded, a valve was missing, the other valve was damaged. The spark plug was damaged and there was a tiny hole in the engine cover underneath the con rod. I don’t know what failed first. Some think it was the con rod breaking, some think it was the cam chain tensioner failing.
I used 15W40 oil because a mechanic told me to due to the long highway runs I have to make.
I did a few 3-4 hour runs with 15W40 oil and it didn’t fail me then. This was just a 30 min ride from school when it happend.
The bike had been serviced a few weeks prior. So I don’t really know what caused this, but probably the manny highway runs I did on it.
@@ROWHAWK I know exactly what caused your con rod, piston, and 1 valve to be obliterated. 2 plausible occurrences.
The oil went beyond maximum operating temperature... losing it's viscosity and shear strength. Orrr, the thicker oil obtained what's known as cavitation. Essentially, cavitation occurs when tiny air bubbles accumulate in the oil at high RPMs, and because of the increased viscosity of the 15W-40 oil, the bubbles cannot surface quick enough. Therefore, the bubbles travel with the flow of the oil, then traveling to your con rod bearings and causing a lack of pressure between the surfaces.
Here is the process of destruction that ensued within your engine...
The con rod bearing wore down & seized, the valve to piston clearance was reduced... your piston hit your open valve on the exhaust stroke, the sudden reduction of piston travel caused your con rod to snap while still on the exhaust stroke, a chunk of metal from your piston or con rod flew down out of the cylinder like a medieval cannon and punched a hole through your oil pan. That cover beneath your con rods is known as the oil pan BTW.
@@MT-THNDR207 oh wow beautifully explained, can you tell how to prevent that from happening
@@jashnn2805 Buy a bike that has an engine capable of that kind of abuse. It's that simple. Preferably something with a good oil cooler. And, use the correct oil viscosity.
Ive been riding for 7 year and I can say I wouldnt have handled that situation any differently. Good reactions and solid decisions, ride like that and youll ride your whole life.
Never keep your bike at high rpm for too long . That's why there's an overdrive gear for high speed and low rpm purposes 👍
overdrive gear? you mean 6th?
@@FarrFromPerfect 5/6 gears are considered overdrive gears
Its a 125, theres no more gears, this is it
@@bambam23406 no overdrive is overdrive gears are gears they are completely different things
@@dietznutz1 wrong overdrive with either manual or auto transmission are the highest gear in automatic situations the ecu chooses the best gear for that to keep rpm low in manual situation it’s the human selecting and at highway speeds depending on if you have 5/6 gears sometimes more
My Honda 125 blew up doing the same. Long (like 20 mile) rides at high RPM keeping up with motorway traffic then exactly the same plop, gone, piston scored to fuck and Honda wanted £3,000 to replace the engine on a £1,500 bike, did it myself for £300. They only have a 1L oil capacity and when doing high revs they absolute guzzle oil, piston probably seized and threw a rod. I won't be doing motorway miles on 125s anymore though, they're clearly not designed for it, Honda claimed "excessive use" when I tried to warranty it.
I think that s the problem with 125cc. You can t stay at the speed limit on highway without breaking because you re too high in rpm
You'd be surprised. Seen lots of sub-250cc bikes, ride highway speeds all day every day for decades. 150's I have seen exceeding 140+kph all day long no worries, every day.
I was surprised to see this thing running at 9k rpm at 75mph. Jeese
@@FarrFromPerfect let me guess..what country?
@@danial1519 Works in most countries. I'm currently in US, but Asia/Europe seems to be the place for the hot little pocket rockets. I fondly remember chasing a HJ125 (Suzuki GN125 for rest of world) ringing its guts out in Shanghai. In terms of what I have personally ridden under 250cc; GN125, TS185, T125, RG125, RG150 (these are amazing!), FXR150, KR150, Aprilla RS125....and probably others i am not remembering. Looking "Bucket Racing" as its great racing class for oddball small bikes. Also the 125 and 150 race classes. Lot's of fun.
Handled it like a champ thank gosh you’re safe. The bike can be replaced but you can’t be.
I noticed you cruise with the rpm quite high, maybe cruise at lower rpm’s for less wear and tear
allright i found 2 things that i personally do in your video and had to point them out:
1: i give my (cheap) bike the "you're doing good" pat.
2: i have a teddy bear on the bike sitting exactly like your's :)
Personally I think it’s the crazy top/cruising speed these little 125cc engines are capable of doing. People forget that just because it’s been made to do it doesn’t mean it’s good for it. Too highly strung to last. I’ve had 500cc bikes that couldn’t go any faster than that, but they would, with regular services/oil changes go twice around the clock. Normally highly strung engines don’t last to long when pushed hard and long. Of course there will be exemptions to that.
Hope it’s not done too much.
Tell that to my mt09 and s1k. 6k rpm’s all day long in the highway for 15k+ miles. No issues. These engines are designed to run like a raped ape.
@@kodyking3090 no they're not
@@danielkerr4100 yes they are. They’re track bikes. They are high revving and built for it. Maybe not a 125
Oh yeah, this brings me back. I used to own a 125cc Taiwanese twist and go scooter that was honestly meant for schoolgirls doing in town runs to the mall. I rode that sucker on day rides from Montreal down into New England. I eventually blew the engine up in New Hamshire in the Presidential Range coming back from Maine. I assume the garage I left it with parted it out.
All this fancy American geographical names (like we care from where, or where to) but no cause of malfunction at all 👎🏿
I owned one of those first ever motorcycle 120kmh on that bike is putting slot of stress on the engine especially if your constantly on the throttle they're very small bikes not meant for particularly highway riding idk how it is in your country might be different. Ps she's clean looks very well looked after 👌
I had a problem like this before but it wasn't the engine. I was riding back home and just like you, for once, I am just relaxing up until my lights and speedometer died. Couldn't even signal so I used hand to signal to the shoulder. Turns out one of my fuses blew up and thankfully I had a spare fuse. Fixed it up and rode home. Turns out, the wiring for my high beam and low beam light was exposed and it made contact.
LOL, the first bike I had was a 1972 Honda CL450. On my first ride down Summit Mountain a touch of the brake pedal turned the engine into an air compressor! It blew "the fuse", as there was only one, but I'd had the foresight to bring spares and electrical tape and a leatherman tool.
@@spaceflight1019 Damn imagine if you didn't bring extra fuse...
@@harriscatbob8656 , this was way before cellphones too, so it would have been a hike to the nearest pay phone.
@@spaceflight1019 jesus, thats actually really scary
Awesome motorcycle riding 👍🏾💯🇬🇧💯
These engines aren't usually prone to any issues. I owned the 150 version out here in Asia with a high mileage. Had no problems as long as you keep up the oil change intervals.
I like how he goes "well, the starter works!" As if a failed starter is going to bring you to a stop on the highway.
Handled the whole situation so well. Time for an upgrade!
entertaining editing. Keep it up!
Thanks for the support!
I got this on my CBR125R little longer then a year ago, ended up buying a Yamaha YZFR125 and never did highway again with a 125cc :p
This happened to me on my speed triple, cam chain guide snapped. Lucky I noticed immediately and squeezed the clutch and coasted to the nearest exit.
Oww man.. broken bikes hurts like a broken heart. I hope you fixed it. Stay safe
Usually when engines go out they like to sieze and buck you, not sure how common it would be on a 125 but considering your engine went thru loads of stress before it went out leads me to believe you lost compression and the engine died.
Not a bike built for highway... I had one, i learned it on my own skin. Good job not panicking and getting safe in time. Iron is fixable :)
On an empty road i usually cruise around 70-110KM/h on my cbr150 and the engine feels pretty hot, can't imagine the heat from that 125 when you cruise on that speed for a long time..
I am surprised he crossed 110km
@@psn3694 those 125 should be able to reach atleast 110 - 120KM/h.
Had the same issue with mit jc39, it was the 'pin' wich holds the conrod and the piston together. In my case, I cleaned the engine from all the metal pieces and bought a new pin. 12,50€. After that it ran again :)
Someone told me, that the jc39 is known for this problem...
I hope you are lucky as well ;)
Jw how much mileage have you put on the bike highway travelling high speed and how much overall on the odo?
I know the bike had 9.000 km when I bought it. Now has 22.000 km.
I did multiple trips to the Netherlands with +/- 350 km (single trip) over the highway going 130 km/h. (Once a month)
Never had a problem. Always did service on time.
When my school year started I traveled +/- 35 km highway (120 km/h) to school and back home on the daily. One of those trips the engine decided to blow.
It’s fixed and I’m going to school on normal roads now. And only twice a week. No more highway till I have an A2 licence.
@@ROWHAWK I can ride highways with my cbr 125cc 2009 without problems. I have rided more than year daily on highways (120-130kmh).
Fair play you handled the breakdown perfectly. Had to smile when you mentioned the head gasket as it sounds like your engine shit its con rod
why did the engine break ? is it because of highway rides ?
That’s what I’m thinking.
People told that a 125 doesn’t like highway because of the high rpm’s.
And I rode it on the highway to university almost every day.
So that’s probably why.
@@ROWHAWK makes sense, i was pretty shocked to see you do these videos on the highway.
also, when you will be able to, whats the next motorcycle you're gonna be getting after the cb125?
Only 207 days 😁
Than I’ll be able to get A2 driver licence (
@@ROWHAWK oh wow that's radical, I thought you were into sport bikes. Good luck!
Thank you, I already have the Vulcan. My grandma gave it to me. It was her bike but she doesn’t ride no more. Otherwise I would have got a CBR 600. Maybe if I get my full license (A) I’ll get a racer 😁
Only a true legend can kill a Honda. It’s sort of like the Highlander thing. Having slain a Honda you are now immortal.
Cruising at 120km/h on a 125 for so long distance, is too much for that engine
nah its fine. depends on bike and ownership. Go lookup "bucket racing"
@@FarrFromPerfect I had a 150cc Chinese scooter I just scrapped last week, took it on the highway every day, no problems . scrapped it because everything else failed but the engine was still good at 20k
I had the engine of a Repsol CBR 125R explode whilst riding country roads, still to this day not exactly sure what happened but the inside of the engine was completely mangled, not economical to repair. Had to source a complete replacement engine for it.
Anyway you handled it well considering the situation, I was lucky in so far as I was the only person on the road but having something like that happen on a busy highway is something different entirely.
Judging by the oil coming out of the exhaust I'm betting something happened to the valve
Yes and the connecting rod snapped causing the valves to break
had my rs50 blow on the dual carriageway at night in the rain so i feel your pain 🥲
a 125cc is not designed to travel at 120km/h for a long period of time
Define long? I've seen them do it for hours no problem.
@@FarrFromPerfect so many people here without any knowledge. 125 engines are pretty much indestructible, just need to have oil in the engine... Traveling like this is completely fine, my old 125cc 4 stroke supermoto revved up to 10,500rpm. 9k is no problem
Always make sure that while you're "Heaving" your way home, that you're also Hoing your wave home as well.
I got one i do highway runs on it i think the last person that had it didn't maintain it well i always service mine on time no problems
Could be the case. Another thing that could be the problem is that my family lives in
The Netherlands and I moved to Belgium. Twice a month I did 4 hours trips to the Netherlands (At least 2,5 hours highway) and I always pushes it to the limits. (Laying flat on the bike to reach 140). So I won’t do that no more till I have another licence and a bigger bike.
@@ROWHAWK do you think a 6'4ft or 1,95m guy like me will comfortably fit on one the same?
I’m 1,80 meters and it sucks. The bike is to small for me. It is not that big of a problem. But even taller? No. I wouldn’t recommend it for you. Maybe something like an Afrika twin?
@@ROWHAWK Get a 2 stroke and you can do 140kmh without stressing the engine a bit
I’ve recently got a VN 800, only need to get my license. Than I can do 140 without a problem 😉
Very good job, good reaction to the situation, when my bike blew up i was so clueless, luckily 125s are cheap to rebuild 🤣
How many kms did you have on it? I also have one like this, love the little bike, it's a bunch of fun
Bought it at 9,000 km, after a year of riding it’s at 21,000 km.
Even though it’s a fun bike for in the city, I can’t wait till I’m allowed to ride a bigger bike.
@@ROWHAWK just buy a bigger bike lol
@öykü, I did. I’ve bought a 600
@@ROWHAWK and how much stronger? I wanna get too but idk if not too strong
The law limits to 35 kW (48 hp), so the bike I bought had 57 kW but has been restricted.
You're a great driver sir. Hope your bike is now fixed.
You re safe brother , either its expensive or not! Keep riding and always keep your cool.
People think because engines are small they can take being ran flat out all the time and they can for a bit but if you want a engine to last try and stay around half the red line when cruising long distance. Staying up near the red line will blow them early! Good oil is a must!
Good job you stay calm you handled this like a pro hope you get it fix soon and get back on the road
Nice reactions, you are a born rider :D
Hey my subaru did the same thing but instead of just dying int BANG CLANG DING BONG BANG BANG! it was a pretty sick drum solo tbh.
Handle it flawlessly! Good time to get to know your bike and rebuild!
Damn that sucks dude! Hopefully it wasn't too expensive and your back enjoying your bike!
Could still be low oil due to consumption at high speeds. The CBR250R and 300R have had failures due to their long service interval and owners not checking oil level.
I think it's not just the head gasket! I heard some clunky metal sounds! It's gonna be expensive! That's why, In India, We don't even cross 90 KMPH on a 125 CC (Even if the bike can go much faster). It's gonna blow something up! If you wanna be faster than that, you should maybe invest in a higher displacement engine. 300cc is a good start. There is no replacement for displacement. Get a bigger displacement and ride at cruising speeds. The engine stays healthy!
A short story, I once did 200 kms on a Hero-Honda 100CC bike in one single sitting! Constantly kept the speed at 60-70 KMPH! (Speeds are slower in India) and the bike was very happy to do more! I Still have the bike and about to reach total lifespan validity!
Nicely handled it! It was dangerous! Glad you're okay!
Had similar happen recently, yours looks alot better so hopefully by this time you back up and on 2. I sent a rod through and now have an entire chunk of my block missing 😅
Glad your good brotha, 1 down the rest is up from there
Glad you’re ok! Don’t sweat it buy a new bike and get back at it!
Fixing it might be cheaper 😉
my rc125 did like the same thing so i tried to start it with giving a little bit of gas and then it turned on i have a inspection in a few days so they will check if anything is wrong
oh no! our gasket! it’s broken!
nah fr nice one man, handled flawlessly. I think I’d be stuck in the outside lane still processing what was going on 😂
Only 75mph on a 125, geezus. My z400 vibrates like crazy at that speed, I can only imagine on a 125
Had the same bike 2 years ago, exact same colors, i was heading a nearby city, suddenly the engine stops on the middle of the highway. I couldnt start it back and went back home on a truck.
I disassembled the engine at home and the exhaust valve was kissing the piston, a total mess. The poor CBR ended on a scrapyard.🥺
wait why dont u just repair it?
@@ssi3262 bike had 44.000km and 5+ falls, bought it for 650€ with 28.000km. I prefered to buy a new bike.
@@romellanorider7381 well if that was the case, i'll be do the same thing as you.
Luckily nothing happend to you! Handled it really good man!
Close to redline most the time is sometimes hard, but you may actually be alright if it’s under factory warranty still as it was a failure of normal processes of riding
The sound it makes before it give up reminds me when i bent the valve stem on my 125. Could that be the problem?
Lotta stress on that little motor. Whole different animal than my Concours 14! Lol!
Nobody is mentioning that adorable stuffed animal, so I will. That is cute as shit. Love it.
it can be valve floating or the piston stuck because overheat idk, but it hurts to watch this
How many kilometres has that bike covered and how many of them where it was a continuous 8000+ RPM on the highway?
Aww that sucks. Little 125s aren't meant for full throttle for too long a time. Ive had a break down too. Caught a nail in my rear tire. Both tires have tubes so i had no chance of a roadside repair.
I'd be surprised if this has anything to do with it being a 125cc, I had both the older two stroke Cagiva Mito 125 and Aprilia RS 125 + 4 stroke 125 Cruiser and 125 Moped and none of them blew engines like that. Those old 2 strokes are mental, push out more than twice the BHP of the CBR and I suspect at considerably higher RPM's. That's not to say the Mito and RS125 are reliable, far from it, you break anything on those bikes (and you will) you'll be in tears when you see the bill. I think you've just had a bit of bad luck honestly, hope you're back on the road again soon. Stay safe out there.
Fastest my old cb125 would go was 55mph downwind. You were thrashing that bike.
Within 1/2 inch from the red line for ages....I was taking it slow... But your engine is going literally at 10,000 rpm! For 30 min? More? 🤯
My brother's BMW K1200S recently blew up while driving 200 kmh on the highway..
The connection rod broke and busted the engine casing, oil all over the rear tire, but luckily he didn't crash
I hope ur bike will be ok after this and be safe on the road, man
Hold the clutch and let it glind from time to time. A friend told me that. Keeps the engine chill.
How many ks were on it when you got it? Any previous irresponsible owners? I have an 06 CBR125, do the maintenance properly, getting my A2 soon and need it to hold out for me for the remaining month or two
I bought it at 9k km on it. It was good maintained and had no issues.
Hondas are known for their relatability, so you shouldn’t be to worried about your engine dying on you.
I just had some bad luck I guess.
Good luck with your A2 license! It’s a lot more fun.
Ride safe! 🏍 💨
@@ROWHAWK thanks, you too
What rpm are you at to keep a 125cc going 76mph?
Redline. lol
@@KevinHammond1 lol
HOW DO YOU CASUALLY GO 75 ON 125CC motorcycle???
125’s are actually a great lesson in how engines are designed and tuned because they’re all the same capacity and you will find their limits on a normal road ride. For example the grom revs low for a bike and has a narrow, long stroke - good efficiency but only makes 9hp. So a grom tops out well before 60mph for most people. A sport bike like this have wider pistons and a shorter stroke so can rev higher and respond faster. They’re not as fuel efficient but make much more peak power. I rode a gsx-r125 and got it to an indicated 82, I’m sure a lighter person could get it even higher.
Of course usual trade off - the grom’s peak torque is lower down the revs too, and it has little wheels so it’s got a lot of low speed power, making it more fun at lower speeds, whereas these bikes make their power and torque higher up so the feel even more gutless at low speeds, even for a 125.
A lot of naked bikes like the cb125f (to keep it in the family) balance the two with squarer engine strokes and middling power (often around 11/12) to get good efficiency, and good enough low speed and higher speed (for a 125) performance, usually capping out somewhere around 65 or so.