FMF 4-Stroke muffler tips

[@kylestewart8354]

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.

[@Blankname209]

Loud pipes save lives

[@tristiangoodman4252]

@@Blankname209 not off-road

[@BamBam99887]

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

[@acrazedtanker1550]

​@Blankname ever hear of the doppler effect? Loud pipes don't save shit lmao, they sound cool and you need justification.

[@haydenpatstone2849]

@@Blankname209 not on track you squid

[@philp7648]

"Any type of tool" me trying to pop a clip ring with a sledge hammer

[@Wartsy]

I broke😂😂

[@michaelcandelaria1520]

I was looking for this comment 😂

[@viktorhardindyrvold4234]

This guy is not good with words lmao

[@amygallagher3552]

​@Michael Candelaria

[@manwithnoname734]

I prefer a hammer drill

[@Wyco_Hill_Killers]

That’s the most legal way bro could find to show people how to take the spark arrester out 😂

[@chanceguilherme2589]

So should you take this out or no and can you do this on stock mufflers

[@ThePower1037]

@@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.

[@chanceguilherme2589]

@@Scavendon lmao def not I’m ah 69 mustang guy

[@LarryVeney-hy2cu]

It's not illegal if it's my dirt bike

[@crimsontide9532]

@@chanceguilherme2589 he said that while sitting in his squatted turd of a Tahoe with trash can tips lmao

[@pinscherpower1]

Only you can prevent forest fires😂

[@rendimarvellio2667]

😂

[@aydenrich262]

That should be fmfs new slogan

[@robertbutler5615]

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??

[@Jcs05]

@@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

[@robertbutler5615]

@@Jcs05 ah ok I kinda see now

[@ocker58]

My buddy's bike shoots flame, I don't think he's burnt down the woods yet😂😂

[@ITS_YO_BOY_CAM]

Lol

[@Revy8]

I dont think youll b coming to update this post when he does

[@ocker58]

@@Revy8 well hopefully that day never comes😂😂

[@natemerzlak18]

@@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

[@ocker58]

@@natemerzlak18 yeah, I'm not super worried about it, my buddies have been riding for years and never been checked

[@ChiTownGuerrilla]

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.

[@FirstFamilyCharger]

Eeeeh but companies are also restricted by regulations

[@Living_My_Life-db7fg]

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.

[@sendit9129]

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.

[@ironken1796]

This! ☝️

[@jordanonofer3886]

Love J's vids. Easy to follow. He explains things easy

[@goinhot9133]

As he BS’s his way thru lol

[@trippjonesiii6566]

love your channel

[@ashtynroney3625]

Sir Smokey the bear told me to throw those away😂

[@944LS]

As soon as he said “back pressure” I knew this video was full of it 😂

[@e30gangsta]

Exactly no motor likes back pressure.

[@Joebauers2505]

@@e30gangsta not true there is 1 type of engine that utilizes backpressure.

[@e30gangsta]

@@Joebauers2505 not a 4 stroke.

[@Joebauers2505]

@@e30gangstajust glad some one got it, thank you.

[@JoeRadman]

“If it’s been used a bunch, it’s harder to get out” that hasn’t been my experience.

[@tony4metallicaify]

Back pressure is a 2 stroke thing, 4 stroke have little effect on back pressure especially with the new fuel injection system

[@Random-dq8ew]

Back pressure is not any engines thing. It't every engines enemy.

[@tony4metallicaify]

@@Random-dq8ew No! 2 stroke engine exhaust pressure makes a big difference, that fatty pipe not there for looks

[@Random-dq8ew]

@@tony4metallicaify Not for pressure neither

[@jonathanmoulton9251]

I hear a lot of four strokes back fire. That’s back pressure.

[@tony4metallicaify]

@@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

[@llecki]

That’s the cleanest spark arrestor ever! It’s brand new 😮

[@3BrothersExtreme]

Great tip

[@tyladube801]

I actually like the screen in there it prevents kids from dropping rocks down the pipe which is hard to remove from the exhaust

[@-HUBBABUBBA-]

No, it’s a spark arrestor. It prevents sparks from flying out of your exhaust and setting off a forest fire.

[@demonstare1]

That happens alot for you?

[@DWBmotorsports]

Needing Backpressure. The most common myth ever repeated in the exhaust world.

[@moabsingletrack]

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.

[@coltondoescars]

👏 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... 😂

[@Random-dq8ew]

Amen

[@cravenmoorehead5636]

Well said. Well said.

[@blizzthebike]

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.

[@cravenmoorehead5636]

@@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

[@p.kem4018]

So you cut the spark assistor to quiet it down??? 🥺

[@nhbountyhunter]

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.

[@TheMontagGarage]

Backpressure is a myth

[@KrzyKanuck81]

It goes right in the garbage 👍🤟

[@Busdude97]

Scrap metal😂💯

[@TheLoneWolfQC]

100%

[@ChiTownGuerrilla]

Yeah because FMF just through it in there for shits and giggles, they don't know what they're doing! Smh.

[@MISTERSLLIM]

​@@ChiTownGuerrilla it is there bc its illegal to right parks without a spark arrestor....

[@ChiTownGuerrilla]

@@MISTERSLLIM I know? I was being sarcastic.

[@lesbratton]

Gee, the old spiroloc, has been retaining wrist pins for decades.

[@jakethesnake121394]

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

[@HUNTER-je6qy]

Motor idaman🥰🥰🥰🇲🇨🇲🇨🇲🇨

[@trippzzinx7963]

I’m listing to this song rn

[@Dontgetsoupset]

I ride on private property lmfao make as much noise as we want😂

[@davidleonard8369]

Clip is a spiroloc. Yes parts have names.

[@GhostedEgo]

I don't need help pulling out. I have a lot of kids...... Okay maybe I do need help pulling out

[@yrusonoz5574]

😂

[@spicydoughnut8397]

When youre an Enduro rider and your favourite band is DEF LEPPARD ❤🏍️

[@Sackmatters]

Spring retaining snap ring and a pick brother. Back pressure has been proven time and time again to do absolutely nothing for an engine.

[@Jmacfann]

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.

[@rosslefave5877]

​@@Jmacfann that's insane u can't ride a dirt bike on the highway or anywhere u want??

[@Jmacfann]

@@rosslefave5877 Is that sarcastic?

[@rosslefave5877]

@@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.

[@rosslefave5877]

@@Jmacfann just don't ride under the info is the only rule I ever heard of

[@tuvdwbdhfjsbf6828]

Or you can just scrap the whole bike and buy a 2 stroke

[@ammo2960]

Why tf would one do that

[@rileykelly5900]

@@ammo2960cos they sound heaps better

[@julian23561]

reng-geng gang represent.

[@kingtnaughty189]

​@@rileykelly5900nah 4 stroke is the muscle car of the dirt bike world

[@parkerw1640]

@@ammo2960 like ur pfp lmao

[@michaelmays9292]

Robs a lot of torque

[@astontoftero3404]

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]

That’s just a spark arrester. Really not affecting you all that much. It’s the rest of the exhaust design that’s important

[@astontoftero3404]

@@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

[@repoman28d]

@@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.

[@astontoftero3404]

@@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

[@GameOverGuardian]

Got the garage apron on, serious stuff

[@bc4evernow]

Yeah that coo

[@IsaacForman-gq5oj]

Please a sound test

[@sachinpimpare1692]

😊😊

[@JokerInk-CustomBuilds]

Don't y'all just loooove tips that go "Get the right tool!" :D :D :D

[@Tatersauce247]

I pulled my baffles out of my Harley and my spark arrestor out of my 450 TRX smoky the bear told me to

[@fish_R_stinky69]

lol

[@benjaminfranklinhawkeyepie9721]

No need for back pressure 😉

[@Retarded_Cat]

“A little tool, any type of tool”

[@jaygoga9679]

❤❤❤❤❤❤❤

[@davlupo00]

Sound check?

[@quartfeira]

Dude discovered dbkiller

[@spongbob18]

Its a spark arrestor 🤣

[@realMaverickBuckley]

I know... 'Insert' .. 'Good Back Pressure' I hope this dude isnt pretending to be an engineer.

[@mxgp33]

A good pull out game can save you a lot of headaches.

[@kimbopslayer562]

What does the backpressure serve? Makes no sense, dragsters don't use backpressure

[@afroman5531]

Its more of a thing on 2 stroke motors

[@jacksonblanks8038]

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

[@cravenmoorehead5636]

​@@jacksonblanks8038 go back to school my friend.

[@jacksonblanks8038]

@@cravenmoorehead5636 get my PhD my friend. Bachelor's and masters already secured

[@ODINSxTHRONE]

Man ktms are nice ja!

[@shaneapplegate1975]

This recipe is how you piss your neighbors off

[@ciscoh1]

I need to replace this on my exhaust, I forgot it had one

[@yannickboucher8331]

😊merci pour l info 😊

[@fulbabusk4734]

😮😊

[@ChanceSavage]

Nice bike bro

[@user-dv8wz1ji6h]

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.

[@jasondonnelly8940]

Thanks 😉

[@mechtech85]

Back pressure is a myth

[@JScars09]

Im about to get my first bike (50cc 2-stroke) and im thinking about doing this 😂

[@bubaa1218]

My q4 came without it installed thank god. It still came in the package tho

[@machnonevideoproductions3630]

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

[@kendrickdonnelly]

Good jokes man

[@bilboswaggens2975]

I love my yoshi. Just a set screw

[@JJRX450]

I took mine out of my fmf on my crf450rx a soon as it come out of the box 😂

[@sleepeasywithwhitenoise3860]

We Use mine to filter my tea leaves from my teapot

[@albugabriel5270]

If you take it out, do you need to do anything to the ecu?

[@QuoteFarm]

We want exhaust velocity, not exhaust backpressure

[@Tom._.498]

You can do one vidéo for one Honda crf 125

[@OneBigPuzzle]

Any kind of tool? Got my jackhammer here.....

[@justinwalters4275]

But what if you do the track thing on road

[@andikamantera8230]

😊👍🤟

[@rivalsdevstuff364]

My dream is to get a CRF150 but my mom won’t let me even use my money to buy one.

[@kellynourse3032]

I ride a 65 moving up to a 85

[@jollyviking8583]

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.

[@rico8089]

More videos like this, please.

[@claytonlambeth1445]

Just leave it in folks. No reason at all to take it out

[@Barbonelbujarron]

Bonita cosechadora!

[@bintangbanawa]

belinya dimana?

[@konstantinostselios1129]

Back pressure? Really?

[@Gamer_4Life.]

😲👍

[@chancesmall7026]

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

[@Klx110rlLogan]

Will it mess up how my bike runs?

[@Lukedormer]

Do you ever do more advanced videos?

[@dirtbiketv1]

That is the main thing we do-- check out the home page-- and subscribe --

[@Rah-hv5qg]

I blew that out of my bike without any tools just gotta hit the throttle hard enough lmfao

[@StickA-yd4fp]

Pick it's called a pick.

[@gothops154]

For no reason. It doesn’t make any difference it just stops sparks from flying out. “Additional back pressure” big lol dude

[@p.kem4018]

Dude trolling himself

[@kontrollme9034]

Always take the spark arrestor out 🤷🏾‍♂️ I like my shit loud.

[@ScarfDoesGaming]

My Yoshimura is pitch black. Do i need to replace it?

[@tylerbrothers6840]

That's a KEG CLIP!! HAHAH

[@MrJamesstott]

Do 2 strokes have these in? I have a KTM 105 with full fmf exhaust

[@brabbit7703]

Since when do they sell bikes with fmf pipes on them ?

[@gmannbmx5021]

Can i do this on a 2 stroke?

[@m.ikhsankhurfatoni]

minimal Maksimal motor drag segoldong

[@Josh___d___G]

That’s just a spark arrester right?

[@johnwhitney5353]

This clip would of been helpful in 2005 😂

[@2strokesRuleeee]

Maybe I like blowing flames out my exhaust when hit my rev limiter

[@TGB_100shots]

So if i remove the net, Will my KTM 450 give more pops or just flames ?

[@OleMisss]

@@TGB_100shotsmix of both depending on the tune you’re running. Used to have foot long flames coming out my kx450 for shits and giggles. 😂

[@TGB_100shots]

@@OleMisss I don’t have an power commander

[@charlesclapper8982]

What does it do to power on 250f

[@boostybotha355]

“A little tool, any type of tool”. Oh yeah? Would I be able to do this with a rubber mallet?

[@paulhetherington3854]

KTM = YZ(frame) || HRC(motor)! KTM= That's for - our family's moment! We own - KTM YSP HONDA!

[@AfsaBibi]

Iwant 350 cc bike