For all you kids out there. LEAVE IT IN. 250cc will not benefit any with open exhaust. Youll just get more riding areas closed down do to excessive niose.
That’s where ur wrong bc on my 22’ kx 250 x I put a fmf q4 and a spark arrester limits power big time like 5-10 hp big time so yes state parks might be illegal just put it back and most of the time they won’t check
@@chanceguilherme2589 You can, it's just not a good idea. you'll get 2hp max, and the forest fires these things prevent is worth keeping the small metal screen.
Geniune question how would a dirtbike even start a fire?, I ride I got a cr85 but I don’t understand cus my bike has never backfired before or anything that could cause a fire so I’m kinda lost??
@@robertbutler5615 sparks or other hot flammable shit can travel down the pipe. Usually theres just a metal screen on the exhaust tip. removing it just makes you liable for burning down a forest
@@ocker58 I run a spark arrester, it more of a legal thing. If the dnr sees me shooting flames Imma get a ticket which means less money to dump into my truck and bike
It's not FmF just knows what they are doing, of course they do, like the commentor above said they have so many regulations/laws to navigate through so they do everything to make sure they comply, just like car manufacturers with catalytic converters. On the other hand if they knew it wouldn't change performance for the better they would not make it so simple to remove.
Beneficial back pressure is a myth. Maximize exhaust velocity while minimizing exhaust pressure. Any amount of pressure seen at the back side of the exhaust valve is lost hp and retained heat. People mistake exhaust velocity for backpressure, velocity is what creates the scavenging effect every combustion event. The only time "back pressure" (Drive pressure) is ok is with turbo vehicles, and the ideal drive pressure is 1:1 with MAP.
@@okerhrh4139 The majority of your exhaust velocity is created at the header... I'd estimate around the first 12in of exhaust. In almost all cases for modern bikes, the removal/addition of the spark arrestor alone isn't gonna have a noticeable impact on performance either way. The only thing it changes is the tone of the bike, and often people get a placebo effect from that tone change and think the bike makes more power.
People who think backpressure is a good thing don’t actually know anything about how exhausts work. Backpressure is always bad. The whole point of an exhaust is to get the gasses out as quickly as possible for the next cycle. Exhaust velocity and scavenging is what matters.
👏 Well explained. People do not seem to understand that exhaust scavenging is NOT the same thing as backpressure. I made a short about how needing backpressure for performance is a myth, a while back. Got comments from people telling me that without backpressure, you'll burn up your valves... It doest take that much effort to think about it for 5 seconds and realize that what they are complaining about is literally the need for exhaust scavenging... 😂
What YOU don’t understand is that without a proper tune a bikes A2F will be ruined by the lack of backpressure. That’s what we mean when we refer to that. That’s what people like you forget! Not everyone gets a tune. Backpressure is necessary without a tune.
@@blizzthebike Thats clearly the part you do not understand. Think of it this way. An engine is basically an air pump. With that being said an air pump with back pressure is clearly less efficient than a pump without back pressure. Hang on ill post a link to a video and let a professional give you an explaination. Hold up a sec
@@jonathanmoulton9251 actually that is unburnt fuel loading up in the pipe then spontaneously explodes, so yes back pressure does play a roll in it, but hey man I’m not no expert, I just been working on power sport my whole life lol
When I hear people say “engine like a little back pressure” it makes me cringe... scavenging and back pressure are two different things and no engine wants back pressure
Can everybody agree a motor is an air pump (you all better say yes). More in, more out is the simplest way to prove back pressure is bad. It is much more complicated, I know. When goin out if you speed up the air faster then goin in then you can got more in (scavenging). If you straiten the flow you can get more out buy (scavenging + resistance too). Bigger out then in (but not too big) will help. Too big can cause low pressure spots actually sucking in air from the tail pipe leading to opposing forces. You can do simple test at home with a small fan, cardboard, ducting and tape. Do it your self. See if you can increase air velocity from a fan using those materials. Its fun and you just may learn something.
What does do something though is a spark arrestor and if you are riding trails DONT RIDE WITH OUT ONE. Shit like that is why there are so few places to ride now. (my state has 7 that is it and you can only ride May to Nov.
@@Jmacfann I put studs in the winter and ride. Never has been a day I couldn't ride the 650 don't like to take off in the snow but keep it moving like a car. Drunken old lady with broken hip on the back on a sheet of ice fun times.
the exhausts are designed to be run without the baffle, i worked at sc project for a little bit designing full race systems, we always shipped them with the baffles, but they were never intended to be left in there, if anything the increased resistance in pushing out the exhaust, takes away from the air and fuel you can push into the cylinder, meaning you get a weaker explosion, which means less power, the optimal back pressure is without the baffles, with them you're just choking down the engine
@@repoman28d you try and get a full race spec system and run it with and then without a baffle, you will feel a difference, yes, the other parts of the exhaust have a effect too, but choking down the entire exhaust, making it move slower and there for letting in less air into the cylinder will make it run worse and produce less power
@@astontoftero3404 the screen isn’t slowing flow nearly at all. It’s simply preventing a potential live spark free and starting fires. Off road guys understand and the mx guys don’t use them because they aren’t required on a closed course. The amount of power a modern 4 stroke mx bike off the showroom floor is more than most can handle and the difference felt between a spark arrestor or none is negligible.
@@repoman28d clearly you haven't seen a baffle, let me explain, in the muffler part of the exhaust, you have a little piece of metal that makes the diameter of the exhaust go down, meaning it chokes down the entire exhaust. It is not a spark arrestor, it is a baffle that chokes down the exhaust as a consequence of making it quieter
It's a dirt bike so km pretty sure that for when you do trailing or off roading In muddy conditions that filter is supposed too keep rocks an little pebbles, stuff that's not supposed too go into your exhaust but some people dont really see that useful but yeah it sounds cool gives it a little more hp. But your right keep it on for trailing.
Back pressure is a myth. To my knowledge it was a myth started in the 1970's so people wouldn't modify car exhaust and take out restrictive emissions equipment. There is a reason race cars/ bikes don't have restrictions in the exhaust system
With a 4-stroke engine, the valves are all shut during the compression stroke, so you don't need any external pressure to get good compression - the cylinder is effectively sealed.
It acts as an "artificial valve" in 2 strokes where air/fuel mixture may normally be lost to the exhaust. The extra pressure in the exhaust mitigates this allowing for more fuel to be in the cylinder for ignition. For anything 4 stroke mitigate back pressure. You actually want as low of pressure on 4 strokes when that exhaust valve opens
For all you kids out there. LEAVE IT IN. 250cc will not benefit any with open exhaust. Youll just get more riding areas closed down do to excessive niose.
Loud pipes save lives
@@Blankname209 not off-road
That’s where ur wrong bc on my 22’ kx 250 x I put a fmf q4 and a spark arrester limits power big time like 5-10 hp big time so yes state parks might be illegal just put it back and most of the time they won’t check
@Blankname ever hear of the doppler effect? Loud pipes don't save shit lmao, they sound cool and you need justification.
@@Blankname209 not on track you squid
"Any type of tool" me trying to pop a clip ring with a sledge hammer
I broke😂😂
I was looking for this comment 😂
This guy is not good with words lmao
@Michael Candelaria
I prefer a hammer drill
That’s the most legal way bro could find to show people how to take the spark arrester out 😂
So should you take this out or no and can you do this on stock mufflers
@@chanceguilherme2589 You can, it's just not a good idea. you'll get 2hp max, and the forest fires these things prevent is worth keeping the small metal screen.
@@Scavendon lmao def not I’m ah 69 mustang guy
It's not illegal if it's my dirt bike
@@chanceguilherme2589 he said that while sitting in his squatted turd of a Tahoe with trash can tips lmao
Only you can prevent forest fires😂
😂
That should be fmfs new slogan
Geniune question how would a dirtbike even start a fire?, I ride I got a cr85 but I don’t understand cus my bike has never backfired before or anything that could cause a fire so I’m kinda lost??
@@robertbutler5615 sparks or other hot flammable shit can travel down the pipe. Usually theres just a metal screen on the exhaust tip. removing it just makes you liable for burning down a forest
@@Jcs05 ah ok I kinda see now
My buddy's bike shoots flame, I don't think he's burnt down the woods yet😂😂
Lol
I dont think youll b coming to update this post when he does
@@Revy8 well hopefully that day never comes😂😂
@@ocker58 I run a spark arrester, it more of a legal thing. If the dnr sees me shooting flames Imma get a ticket which means less money to dump into my truck and bike
@@natemerzlak18 yeah, I'm not super worried about it, my buddies have been riding for years and never been checked
I trust FMF to know what they're doing, and that it serves a purpose. Leave It in, any power gain already happened from the aftermarket exhaust.
Eeeeh but companies are also restricted by regulations
It's not FmF just knows what they are doing, of course they do, like the commentor above said they have so many regulations/laws to navigate through so they do everything to make sure they comply, just like car manufacturers with catalytic converters. On the other hand if they knew it wouldn't change performance for the better they would not make it so simple to remove.
Beneficial back pressure is a myth. Maximize exhaust velocity while minimizing exhaust pressure.
Any amount of pressure seen at the back side of the exhaust valve is lost hp and retained heat. People mistake exhaust velocity for backpressure, velocity is what creates the scavenging effect every combustion event.
The only time "back pressure" (Drive pressure) is ok is with turbo vehicles, and the ideal drive pressure is 1:1 with MAP.
This! ☝️
So does it increase velocity then? Is it in the end still a positive mod to remove the baffle on dirtbikes? Or.. thanks for the heads up
@@okerhrh4139 The majority of your exhaust velocity is created at the header... I'd estimate around the first 12in of exhaust.
In almost all cases for modern bikes, the removal/addition of the spark arrestor alone isn't gonna have a noticeable impact on performance either way. The only thing it changes is the tone of the bike, and often people get a placebo effect from that tone change and think the bike makes more power.
As soon as he said “back pressure” I knew this video was full of it 😂
Exactly no motor likes back pressure.
@@e30gangsta not true there is 1 type of engine that utilizes backpressure.
@@Joebauers2505 not a 4 stroke.
@@e30gangstajust glad some one got it, thank you.
People who think backpressure is a good thing don’t actually know anything about how exhausts work. Backpressure is always bad. The whole point of an exhaust is to get the gasses out as quickly as possible for the next cycle. Exhaust velocity and scavenging is what matters.
👏 Well explained. People do not seem to understand that exhaust scavenging is NOT the same thing as backpressure. I made a short about how needing backpressure for performance is a myth, a while back. Got comments from people telling me that without backpressure, you'll burn up your valves... It doest take that much effort to think about it for 5 seconds and realize that what they are complaining about is literally the need for exhaust scavenging... 😂
Amen
Well said. Well said.
What YOU don’t understand is that without a proper tune a bikes A2F will be ruined by the lack of backpressure.
That’s what we mean when we refer to that. That’s what people like you forget! Not everyone gets a tune. Backpressure is necessary without a tune.
@@blizzthebike Thats clearly the part you do not understand. Think of it this way. An engine is basically an air pump. With that being said an air pump with back pressure is clearly less efficient than a pump without back pressure. Hang on ill post a link to a video and let a professional give you an explaination. Hold up a sec
Needing Backpressure. The most common myth ever repeated in the exhaust world.
Back pressure is a 2 stroke thing, 4 stroke have little effect on back pressure especially with the new fuel injection system
Back pressure is not any engines thing. It't every engines enemy.
@@Random-dq8ew No! 2 stroke engine exhaust pressure makes a big difference, that fatty pipe not there for looks
@@tony4metallicaify Not for pressure neither
I hear a lot of four strokes back fire. That’s back pressure.
@@jonathanmoulton9251 actually that is unburnt fuel loading up in the pipe then spontaneously explodes, so yes back pressure does play a roll in it, but hey man I’m not no expert, I just been working on power sport my whole life lol
Sir Smokey the bear told me to throw those away😂
Backpressure is a myth
Love J's vids. Easy to follow. He explains things easy
As he BS’s his way thru lol
That’s the cleanest spark arrestor ever! It’s brand new 😮
I actually like the screen in there it prevents kids from dropping rocks down the pipe which is hard to remove from the exhaust
No, it’s a spark arrestor. It prevents sparks from flying out of your exhaust and setting off a forest fire.
That happens alot for you?
love your channel
When I hear people say “engine like a little back pressure” it makes me cringe... scavenging and back pressure are two different things and no engine wants back pressure
So you cut the spark assistor to quiet it down??? 🥺
Can everybody agree a motor is an air pump (you all better say yes). More in, more out is the simplest way to prove back pressure is bad. It is much more complicated, I know. When goin out if you speed up the air faster then goin in then you can got more in (scavenging). If you straiten the flow you can get more out buy (scavenging + resistance too). Bigger out then in (but not too big) will help. Too big can cause low pressure spots actually sucking in air from the tail pipe leading to opposing forces. You can do simple test at home with a small fan, cardboard, ducting and tape. Do it your self. See if you can increase air velocity from a fan using those materials. Its fun and you just may learn something.
It goes right in the garbage 👍🤟
Scrap metal😂💯
100%
Yeah because FMF just through it in there for shits and giggles, they don't know what they're doing! Smh.
@@ChiTownGuerrilla it is there bc its illegal to right parks without a spark arrestor....
@@MISTERSLLIM I know? I was being sarcastic.
“If it’s been used a bunch, it’s harder to get out” that hasn’t been my experience.
Gee, the old spiroloc, has been retaining wrist pins for decades.
Or you can just scrap the whole bike and buy a 2 stroke
Why tf would one do that
@@ammo2960cos they sound heaps better
reng-geng gang represent.
@@rileykelly5900nah 4 stroke is the muscle car of the dirt bike world
@@ammo2960 like ur pfp lmao
I ride on private property lmfao make as much noise as we want😂
Great tip
Spring retaining snap ring and a pick brother. Back pressure has been proven time and time again to do absolutely nothing for an engine.
What does do something though is a spark arrestor and if you are riding trails DONT RIDE WITH OUT ONE. Shit like that is why there are so few places to ride now. (my state has 7 that is it and you can only ride May to Nov.
@@Jmacfann that's insane u can't ride a dirt bike on the highway or anywhere u want??
@@rosslefave5877 Is that sarcastic?
@@Jmacfann I put studs in the winter and ride. Never has been a day I couldn't ride the 650 don't like to take off in the snow but keep it moving like a car. Drunken old lady with broken hip on the back on a sheet of ice fun times.
@@Jmacfann just don't ride under the info is the only rule I ever heard of
Clip is a spiroloc. Yes parts have names.
the exhausts are designed to be run without the baffle, i worked at sc project for a little bit designing full race systems, we always shipped them with the baffles, but they were never intended to be left in there, if anything the increased resistance in pushing out the exhaust, takes away from the air and fuel you can push into the cylinder, meaning you get a weaker explosion, which means less power, the optimal back pressure is without the baffles, with them you're just choking down the engine
That’s just a spark arrester. Really not affecting you all that much. It’s the rest of the exhaust design that’s important
@@repoman28d you try and get a full race spec system and run it with and then without a baffle, you will feel a difference, yes, the other parts of the exhaust have a effect too, but choking down the entire exhaust, making it move slower and there for letting in less air into the cylinder will make it run worse and produce less power
@@astontoftero3404 the screen isn’t slowing flow nearly at all. It’s simply preventing a potential live spark free and starting fires. Off road guys understand and the mx guys don’t use them because they aren’t required on a closed course. The amount of power a modern 4 stroke mx bike off the showroom floor is more than most can handle and the difference felt between a spark arrestor or none is negligible.
@@repoman28d clearly you haven't seen a baffle, let me explain, in the muffler part of the exhaust, you have a little piece of metal that makes the diameter of the exhaust go down, meaning it chokes down the entire exhaust. It is not a spark arrestor, it is a baffle that chokes down the exhaust as a consequence of making it quieter
I don't need help pulling out. I have a lot of kids......
Okay maybe I do need help pulling out
😂
When youre an Enduro rider and your favourite band is DEF LEPPARD ❤🏍️
Don't y'all just loooove tips that go "Get the right tool!" :D :D :D
No need for back pressure 😉
I pulled my baffles out of my Harley and my spark arrestor out of my 450 TRX smoky the bear told me to
lol
Robs a lot of torque
Motor idaman🥰🥰🥰🇲🇨🇲🇨🇲🇨
Back pressure is a myth
Please a sound test
This recipe is how you piss your neighbors off
Got the garage apron on, serious stuff
It's a dirt bike so km pretty sure that for when you do trailing or off roading In muddy conditions that filter is supposed too keep rocks an little pebbles, stuff that's not supposed too go into your exhaust but some people dont really see that useful but yeah it sounds cool gives it a little more hp. But your right keep it on for trailing.
A good pull out game can save you a lot of headaches.
“A little tool, any type of tool”
Back pressure is a myth. To my knowledge it was a myth started in the 1970's so people wouldn't modify car exhaust and take out restrictive emissions equipment. There is a reason race cars/ bikes don't have restrictions in the exhaust system
Sound check?
I’m listing to this song rn
If you take it out, do you need to do anything to the ecu?
😊😊
Back pressure is a myth. I hear that one more time imma smack you! Its the right kind flow! "Back pressure" would hurt the ENGINE.
Just leave it in folks. No reason at all to take it out
Its a spark arrestor 🤣
I know... 'Insert' .. 'Good Back Pressure'
I hope this dude isnt pretending to be an engineer.
Man ktms are nice ja!
I need to replace this on my exhaust, I forgot it had one
With a 4-stroke engine, the valves are all shut during the compression stroke, so you don't need any external pressure to get good compression - the cylinder is effectively sealed.
Dude discovered dbkiller
What does the backpressure serve? Makes no sense, dragsters don't use backpressure
Its more of a thing on 2 stroke motors
It acts as an "artificial valve" in 2 strokes where air/fuel mixture may normally be lost to the exhaust. The extra pressure in the exhaust mitigates this allowing for more fuel to be in the cylinder for ignition. For anything 4 stroke mitigate back pressure. You actually want as low of pressure on 4 strokes when that exhaust valve opens
@@jacksonblanks8038 go back to school my friend.
@@cravenmoorehead5636 get my PhD my friend. Bachelor's and masters already secured
My q4 came without it installed thank god. It still came in the package tho
We want exhaust velocity, not exhaust backpressure
Imagine believing that kids without spark arresters are the reason the trails get shut down and not a tyrannical government catering to crybabies.
For no reason. It doesn’t make any difference it just stops sparks from flying out. “Additional back pressure” big lol dude
What’s the point of setting it up with the insert like you do with trail bikes with it hanging out? Does it act like a silencer or something
❤❤❤❤❤❤❤
KTM = YZ(frame) || HRC(motor)! KTM= That's for - our family's moment! We own - KTM YSP HONDA!
Nice bike bro
Pick it's called a pick.
Im about to get my first bike (50cc 2-stroke) and im thinking about doing this 😂
But what if you do the track thing on road
Any kind of tool? Got my jackhammer here.....
My dream is to get a CRF150 but my mom won’t let me even use my money to buy one.
Good jokes man
"Back pressure"
We Use mine to filter my tea leaves from my teapot
I took mine out of my fmf on my crf450rx a soon as it come out of the box 😂
If he’s a second amendment guy, I’ll bet he speaks regularly about “clips” also. If you know, you know😂
Yeah that coo
Back pressure? Really?
😊merci pour l info 😊
You can do one vidéo for one Honda crf 125
😮😊
Do 2 strokes have these in? I have a KTM 105 with full fmf exhaust
I ride a 65 moving up to a 85
My Yoshimura is pitch black. Do i need to replace it?
Can i do this on a 2 stroke?
I blew that out of my bike without any tools just gotta hit the throttle hard enough lmfao
Will it mess up how my bike runs?
Since when do they sell bikes with fmf pipes on them ?
I love my yoshi. Just a set screw
More videos like this, please.
Bonita cosechadora!
What does it do to power on 250f
That’s just a spark arrester right?
that piece is called the spark arrestor and it prevents sparks from shooting out of your exhaust and catching a field on fire. LEAVE IT IN
Dude trolling himself
This clip would of been helpful in 2005 😂
Thanks 😉
I was looking at mine jay and don’t seem to have one ?
“A little tool, any type of tool”. Oh yeah? Would I be able to do this with a rubber mallet?
I roast hot dogs with mine
belinya dimana?
I have gotten pulled over so many times without mine, they don’t care lmao