I wish we lived closer I'd donate one to you. Getting ready to drop a 80cc bore kit into a gy6 50cc case with a ported and polished head, intake and carb. Just waiting on the bore kit.
Autotech355 is a seller on eBay. It's a good street kit. You have to jet the carburetor and probably change the roller weights so they work with the new cylinder. Shouldn't require any other modifications to run well on most scoots.
hi there, how do you found big bore kit is from Autotech355 ? is that good kit . do you have to do any mod on it or just straight bolt in ? just about to order in just for normal ride not crazy race, just want to get good takeoff because where i live limit speed most is 50kph , thanks
I say do not buy a Chinese big bore kit. That's from experience. When I saved a lot of money, I spent more in the long run. I have had cylinder kits with so much piston to wall clearance that I had piston slap with a brand new kit. Some may be OK, but it's a risk. At least get Taiwan made. 10mm piston pin works OK for sport stuff.
So my factory 49cc jet size is ~80? I'm surprised (in your particular case) the additional ~20cc didn't require a larger jet! With a 70cc bbk, tuned pipe, and free flowing air filter- any idea what jet size I might want to start out at before initial tuning? Any thoughts are appreciated.
Did it myself. I'm not sure it will make an improvement. These motors are so finicky and no 2 motors are alike. But the heads intake is a lot bigger and is now in alignment with the intake mainifold and carb, (that is to say there's not an edge for the air to slam into and create turbulence) but well see. Might actually be worst off.
My zuma 50,2t went 40mph. I installed a chinese 70cc cylinder. Now I get max 35mph after trying many different jets. I want to try reworking the ports they looked smaller than stock 50cc ports. Fingers crossed!
You might want to check your squish and compression if possible before you alter the ports. If the compression is low from something like a big clearance, it could cause low output. Also, make sure you check your port durations when modding or even adjusting to be sure they suit whatever you're after. You don't want to end up with high rev racing durations for a low rev sport kit or something.
@@49ccscoot Thank you so much for all that you have shared. It had at least 3mm of squish with 169°exh/122°xfer. I switched back to the stock 50cc cyl head and chamfered the xfer ports up and smoothed the exhaust port shape to get 183°exh/128°xfer with 0.8mm squish without both gaskets. It pegged the stock speedometer today with very little tuning yet and cruises 40mph with hills. All thanks to your posts!
What did you think of the quality of autotech355 big bore kit from Taiwan? As compared to well known kits by Malossi, Polini, Airasol etc. I own a 2006 Kymco Super 9 liquid cooled 2T 50cc scooter. It has a clone of a mirelli engine. Mods from previous owner of scooter are technigas expansion chamber exhaust, 93 main jet(from oem derestricted kit) and 6.5 gram rollers. I'm just looking to for more uphill speed and lower end torque. I tried 4.5 gram rollers(motortic brought from autotech355) which gave me more power but lower top end speed and rpm was 9-10grand most of the time instead of 8 grand. I went back to 6.5 gram rollers. I am a 41 yr old 6'2" 190lbs child who loves his scooter😁 Your input on quality and any opinions possible mods would be great, as you obviously have been there and done that when it comes to scooters. Also been looking at Malossi cast iron 70cc kit but it is $130 more. Thanks
The quality was fine. The consistency is not like the major brands though. A kit from Autotech 5 years ago may not be the same thing you get now. Polini Sport for example should be the same thing as long as you order the same part number, so you know what you're getting. The extra displacement would be a big upgrade.
@@49ccscoot Okay. Sounds like this 70cc kit is old stock as it is not made anymore according to autoech355. Probably be a winter project so I will think whether I will get autotech355 Motoritec kit or the Malossi kit available for my engine. I live in Canada so if I buy the Malossi kit it would be from scootertuning.ca for $300 cad plus taxes. Motoritec kit is $190 cad with possibilty of taxes & duty. Thanks for the great videos, I have been binge watching lately
Hey 49ccscoot! I picked up a eton beamer 50cc and want to put the 70cc 10mm NCY 2t cylinder kit on it! Wondering if it's safe to use stock 50cc head on it? They sell a NCY kit without head and says just use stock head! It would save me $25! Any thoughts?
hello my friend, I'm riding an engine of a Kasinski super 49 cc motorcycle, I'm in doubt which side the piston arrow has to be on, whether it is for admission or escape, v Can you help me?
Hi, great video, I have a sym fiddle version 1 from 1999 I fit a 75cc cylinder kit on can you please let me know if you now what the best size four the Maine jet tank you BERENGUER
james bezer (won't let me reply to you) : I always suggest getting a jet kit in order to ensure that the jet you use is the proper one for YOUR scooter and not just what works for the majority. I've seen jet size with a BBK vary from about 70 to 95 with stock airboxes or stock airboxes with the snorkel removed. Most commonly I'd expect 85-90 main jet. www.partsforscooters.com/?partner=49CCSCOOT sells 10 jet kits for the minarelli engines for about $15.
i have a scooter it takes a wile to start but when it dose it only stays at 10mph then cuts out i have cleaned the carb and wd40 nearly every thing i had a nasty shock from it the other day so it has the volts but its nt using them please help
what Can I do too this kit to make it hit 70mph. besides a stroker. I don't want a stroker. if I was to Change the transmission and a new Carb. will it his like 70s. and how do I know if I have a 10mm or 12mm wrist pin without taking apart my bore kit. is there an easier way.
The easiest way would be not to use this kit. Choose something like a midrace cylinder and a good pipe. Stage6MKII and a Yasuni C16 for example. Will require a carb upgrade and tuning, should use some aftermarket CVT parts and CVT tuning. 49ccscoot.proboards.com/thread/2422/minarelli-1e40qmb-wrist-pin-sizes
Hi 49ccscoot! My name is Jeremy! I am doing a new piston and rings on my 2T Malossi Sport 70cc engine! Do you know what (grit#) Flex Hone ball hone I would need to cleanup and freshly scratch the cylinder?
@@49ccscoot Hi again! I got another question for you! To torque down a minarelli horizontal cylinder head with Malossi Sport 70cc kit what is a safe in. lb. torque or nm torque to set it at?
Do you still have the ped I'm have the same scoot and was wondering what kit you got plus the pipe you got and anything else that made it faster thanks bro
Have you watched this vid by any chance? The engine here is a 1E40QMB/1PE40QMB. There are TONS of big bore kits out there. Here is some help : www.49ccscoot.com/faq/whichbbk.html www.49ccscoot.com/faq/kitneeds.html I also have a forum where you can get help from me as well as a bunch of scooter enthusiasts.
Jack Thomson Not the kit shown. This is a two-stroke. Check your engine code, it's prob a 139QMB or 1P39QMB. If so there are tons of 72cc and larger big bore kits available for it.
Hi can someone help me, i brought a 70cc big bore kit for my cpi moped engine and i brought a new standard 19mm carb. Every time i rev it over half it keeps trying to cut out and has no power, does anyone know why this happens if you do then comment on my video (thanks). Midi moto 70cc cpi moped engine
It's a 1E40qmb I put a 70cc on it and to fine out it was the rubber seal that wasn't in the way so I Titanic it 10foot pound's and stripe it it was the rubber seal that was in the way
You're usually better off with brands like Polini and Malossi. Their sport kits are similar and some Chinese kits are pretty awful. This was a Taiwan made kit, and I've done alright with them, but still the price is so close to Polini etc...
Is there a way we can communicate? Email or hell i would even text you if i needed too. What all do i need to do with the carb? its allready rejetted.. should i modify the airbox? What do you mean cvt tune? I'm new too all of this.
So I slapped 100miles on the scooter and was riding it to work the next day and I threw the fly wheel. The key is dust and the shaft is buggered. Top speed is in the 50mph range.
Hello i like Your videos I need Your help to upgrade my Yamaha jog as my one bearing fail and i cant get any help from japanese pepole because im a foreigner in this country i need to do all by myself.
I wish we lived closer I'd donate one to you. Getting ready to drop a 80cc bore kit into a gy6 50cc case with a ported and polished head, intake and carb. Just waiting on the bore kit.
Hello dear
I put big bore kit on my Keeway F act 50. It goes great downhill and on flat. Uphill is about to stop, carb jetting is stock.
Get a main jet kit and tune the carb. Most likely it needs a bigger jet.
Autotech355 is a seller on eBay. It's a good street kit. You have to jet the carburetor and probably change the roller weights so they work with the new cylinder. Shouldn't require any other modifications to run well on most scoots.
2:10 - You can start to hear the variator/weights around 5second on the counter. The CVT turbo noise lol
Excellent
hi there, how do you found big bore kit is from Autotech355 ? is that good kit . do you have to do any mod on it or just straight bolt in ? just about to order in just for normal ride not crazy race, just want to get good takeoff because where i live limit speed most is 50kph ,
thanks
What do you say about buying a chinese 70cc cylinder with 10mm piston pin? Speed and durability and stock crankshaft effect?
I say do not buy a Chinese big bore kit. That's from experience. When I saved a lot of money, I spent more in the long run. I have had cylinder kits with so much piston to wall clearance that I had piston slap with a brand new kit. Some may be OK, but it's a risk. At least get Taiwan made.
10mm piston pin works OK for sport stuff.
@@49ccscoot the question is will it be better than a stock 49cc at speed and with good care and oili wont have problems?
@@zizo0 Not if you get a poor quality kit. If you get a good kit, then a 70cc sport setup can be very reliable and much better performing than stock.
@@49ccscoot that was the point thanks for answering✌🏼😁
So my factory 49cc jet size is ~80? I'm surprised (in your particular case) the additional ~20cc didn't require a larger jet! With a 70cc bbk, tuned pipe, and free flowing air filter- any idea what jet size I might want to start out at before initial tuning? Any thoughts are appreciated.
Start big, like 100. Work down if needed. Lots of carb tuning help here :
www.49ccscoot.com/faq/carbtune.html
well not that it don`t require its just works with the same jet increasing the jet will get him lower MPG but better performance
Did it myself. I'm not sure it will make an improvement. These motors are so finicky and no 2 motors are alike. But the heads intake is a lot bigger and is now in alignment with the intake mainifold and carb, (that is to say there's not an edge for the air to slam into and create turbulence) but well see. Might actually be worst off.
hi , will the kit improve rmp ? do you think better to upgrade 70cc kit or unrestricted cdi ?
thanks regards
My zuma 50,2t went 40mph. I installed a chinese 70cc cylinder. Now I get max 35mph after trying many different jets. I want to try reworking the ports they looked smaller than stock 50cc ports. Fingers crossed!
You might want to check your squish and compression if possible before you alter the ports. If the compression is low from something like a big clearance, it could cause low output. Also, make sure you check your port durations when modding or even adjusting to be sure they suit whatever you're after. You don't want to end up with high rev racing durations for a low rev sport kit or something.
@@49ccscoot Thank you so much for all that you have shared. It had at least 3mm of squish with 169°exh/122°xfer. I switched back to the stock 50cc cyl head and chamfered the xfer ports up and smoothed the exhaust port shape to get 183°exh/128°xfer with 0.8mm squish without both gaskets. It pegged the stock speedometer today with very little tuning yet and cruises 40mph with hills. All thanks to your posts!
@@finkthreely7089 Great result!
What size jets did you use after the big bore?
80MJ. Whatever the stock pilot was.
What did you think of the quality of autotech355 big bore kit from Taiwan? As compared to well known kits by Malossi, Polini, Airasol etc. I own a 2006 Kymco Super 9 liquid cooled 2T 50cc scooter. It has a clone of a mirelli engine. Mods from previous owner of scooter are technigas expansion chamber exhaust, 93 main jet(from oem derestricted kit) and 6.5 gram rollers. I'm just looking to for more uphill speed and lower end torque. I tried 4.5 gram rollers(motortic brought from autotech355) which gave me more power but lower top end speed and rpm was 9-10grand most of the time instead of 8 grand. I went back to 6.5 gram rollers. I am a 41 yr old 6'2" 190lbs child who loves his scooter😁 Your input on quality and any opinions possible mods would be great, as you obviously have been there and done that when it comes to scooters. Also been looking at Malossi cast iron 70cc kit but it is $130 more. Thanks
The quality was fine. The consistency is not like the major brands though. A kit from Autotech 5 years ago may not be the same thing you get now. Polini Sport for example should be the same thing as long as you order the same part number, so you know what you're getting. The extra displacement would be a big upgrade.
@@49ccscoot Okay. Sounds like this 70cc kit is old stock as it is not made anymore according to autoech355. Probably be a winter project so I will think whether I will get autotech355 Motoritec kit or the Malossi kit available for my engine. I live in Canada so if I buy the Malossi kit it would be from scootertuning.ca for $300 cad plus taxes. Motoritec kit is $190 cad with possibilty of taxes & duty. Thanks for the great videos, I have been binge watching lately
Hey 49ccscoot! I picked up a eton beamer 50cc and want to put the 70cc 10mm NCY 2t cylinder kit on it! Wondering if it's safe to use stock 50cc head on it? They sell a NCY kit without head and says just use stock head! It would save me $25! Any thoughts?
I would get a kit that includes a matched head. Not worth the saving IMO.
My dr50cc did 85, waiting on my top performance 70cc kit
Hello, if you change the cylinder head and piston, will it become 70cc?
Depends on the size of the bore, but it can. You may find this useful : 49ccscoot.proboards.com/thread/2627/minarelli-jog-engine-displacement-chart
Keep them coming, i love to watch your videos! :)
hello my friend, I'm riding an engine of a Kasinski super 49 cc motorcycle, I'm in doubt which side the piston arrow has to be on, whether it is for admission or escape, v Can you help me?
The arrow usually points toward the exhaust.
Thank you very much for your attention🖐️👍👍
0 to 35 is shocking i had a aerox 70 and it did 72 mph and was like a fkn rocket
Any idea if there is a Hpi that will fit this engine?
Hi, great video, I have a sym fiddle version 1 from 1999 I fit a 75cc cylinder kit on can you please let me know if you now what the best size four the Maine jet tank you BERENGUER
james bezer (won't let me reply to you) : I always suggest getting a jet kit in order to ensure that the jet you use is the proper one for YOUR scooter and not just what works for the majority. I've seen jet size with a BBK vary from about 70 to 95 with stock airboxes or stock airboxes with the snorkel removed. Most commonly I'd expect 85-90 main jet.
www.partsforscooters.com/?partner=49CCSCOOT sells 10 jet kits for the minarelli engines for about $15.
i have a scooter it takes a wile to start but when it dose it only stays at 10mph then cuts out i have cleaned the carb and wd40 nearly every thing i had a nasty shock from it the other day so it has the volts but its nt using them please help
We’re can I buy a ta wing exhaust for my 2011 CPI Oliver city 49cc 2 stroke
Ta wing exhaust? Not sure about that, but check out ScooterTuning dot Ca for performance parts. Lots of pipes there.
Love your video's ! I also experiment a lot with 2 stroke's ;)
what Can I do too this kit to make it hit 70mph. besides a stroker. I don't want a stroker. if I was to Change the transmission and a new Carb. will it his like 70s. and how do I know if I have a 10mm or 12mm wrist pin without taking apart my bore kit. is there an easier way.
The easiest way would be not to use this kit. Choose something like a midrace cylinder and a good pipe. Stage6MKII and a Yasuni C16 for example. Will require a carb upgrade and tuning, should use some aftermarket CVT parts and CVT tuning.
49ccscoot.proboards.com/thread/2422/minarelli-1e40qmb-wrist-pin-sizes
Hi 49ccscoot! My name is Jeremy! I am doing a new piston and rings on my 2T Malossi Sport 70cc engine! Do you know what (grit#) Flex Hone ball hone I would need to cleanup and freshly scratch the cylinder?
Here's some info, but I use a 240. www.enginehones.com/technical.html
@@49ccscoot thanks! I think I'll go for the 240 grit Flex Hone
Can't wait to see your SSR moped get the engine upsize!
@@49ccscoot Hi again! I got another question for you! To torque down a minarelli horizontal cylinder head with Malossi Sport 70cc kit what is a safe in. lb. torque or nm torque to set it at?
@@jeremyh.2114 ~12Nm
hi i am about to fit my yamaha jog cv50 with a 70cc big bore kit and i am wondering what jet size i need to change to thanks
So nice yar and so bountiful
i got a hammerhead 50cc 2 stroke, big bored and got a racing exhaust. Top speed 41mph. I want more, all else is stock, what can i do?
Do you still have the ped I'm have the same scoot and was wondering what kit you got plus the pipe you got and anything else that made it faster thanks bro
The stock jog minarelli variator is restricted you either have to modify it or change it to a high-speed one then tune
kool videos really enjoy them and they really help i own a tng 150 milano top speed 97 mph ;} no joke
if I was to put on juss this borekit and a racing exhaust. will it make a big difference in top speed and aCCeleration.
A BBK and pipe will make a big difference... but you must tune the carb and CVT too.
And how big carb?
Will that cylinder kit fit a pw50
thanks will do
please i have Benelli 49x i want uprade to 70 cc what can i do please i need your answer thank you
www.49ccscoot.com/faq/whichbbk.html
www.49ccscoot.com/faq/kitneeds.html
please I have scooter 50 CC engine 1PE40MB and i want upgrade to 70CC please what I can do
Have you watched this vid by any chance? The engine here is a 1E40QMB/1PE40QMB. There are TONS of big bore kits out there. Here is some help :
www.49ccscoot.com/faq/whichbbk.html
www.49ccscoot.com/faq/kitneeds.html
I also have a forum where you can get help from me as well as a bunch of scooter enthusiasts.
hey just wondering if one of these would work on this "Kinroad XT-50 Q CDi 50cc Motorcycle" it is four stroke. yours sincerely jack
Jack Thomson Not the kit shown. This is a two-stroke. Check your engine code, it's prob a 139QMB or 1P39QMB. If so there are tons of 72cc and larger big bore kits available for it.
nice thanks, like i said just got one of those bikes and want to put some more power into it haha. thanks for your help
@ David Hill : You should put some vids up of that.
Hi can someone help me, i brought a 70cc big bore kit for my cpi moped engine and i brought a new standard 19mm carb. Every time i rev it over half it keeps trying to cut out and has no power, does anyone know why this happens if you do then comment on my video (thanks). Midi moto 70cc cpi moped engine
It's a 1E40qmb I put a 70cc on it and to fine out it was the rubber seal that wasn't in the way so I Titanic it 10foot pound's and stripe it it was the rubber seal that was in the way
marc honda Bali
Is it good brand big bore chineze kit
You're usually better off with brands like Polini and Malossi. Their sport kits are similar and some Chinese kits are pretty awful. This was a Taiwan made kit, and I've done alright with them, but still the price is so close to Polini etc...
mine scooter goes 80kmh/50mph with 50cc i got now 70cc havent tried full speed yet
Is there a way we can communicate? Email or hell i would even text you if i needed too. What all do i need to do with the carb? its allready rejetted.. should i modify the airbox? What do you mean cvt tune? I'm new too all of this.
What was the torque wrench measurements
+marc 10-15ft-lbs
So I slapped 100miles on the scooter and was riding it to work the next day and I threw the fly wheel. The key is dust and the shaft is buggered. Top speed is in the 50mph range.
My 50cc did 45 anyway, and all I did was just take off the washer restrictor Yamaha W.H.Y
Hello i like Your videos I need Your help to upgrade my Yamaha jog as my one bearing fail and i cant get any help from japanese pepole because im a foreigner in this country i need to do all by myself.
You should join the forum. I can help, but we also have members with Jogs and even a member with a Jog in Japan.
@@49ccscoot Can You send me link to register in forum please.
@@bernardwitczak 49ccscoot.proboards.com/
try putting/getting a shop to put new rollers in. :)
Do a 4 stroke project
:P