Running without muffler?Will it hurt?

[WannaRace400ex]

I have a 02 400ex and I love the way it sounds with no muffler will it hurt it to run without?
Thanks Eric

[TimSr]

Running without a muffler may cause serious damage to the quad and serious injury to the rider, increased law enforcement activity, and closed riding areas by all the people you annoy, aggravate, and just plain piss off. There is nothing to be gained by removing your muffler other than enemies.

[KASEY]

WHAT HE SAID ,,, times 2 we have sound regulations around here and they would give you a $108 ticket,, put your muffler back on ,,, its just louder not faster,,,

[WannaRace400ex]

I live miles away from anybody i dont ride on public places I have to many acres of my own to go anywhere else so I dont care about pissing people off. I just want to know what if any damage it will cause.
Eric

[TheOlderFox]

The engine is disigned with run with back pressure. Without it your carb adjustment will be off and you can run too hot and piston doesn't like that (melt/pit) Put the muffler on to be safe. There may be a baffle in your muffler you can take out if you still want loud

[Trikemania11]

The engine is disigned with run with back pressure. Without it your carb adjustment will be off and you can run too hot and piston doesn't like that (melt/pit) Put the muffler on to be safe. There may be a baffle in your muffler you can take out if you still want loud

Hes exactly right. In time if you keep running it like that the piston will be gone. On a 2 stroke you dont need a muffler.

[thehickfarmer]

your machine is almost relatively new, don't take a chance put it back on !

[trikerider2oo7]

i wouldnt recommend taking it out unless you want to fudge up the engine beyond worth fixing...leave it on

[mr4x42u]

It may sound cool but I doubt it will run right..Like said,,you need some back pressure..The other thing is you WILL burn a exhaust valve and That sucks..Dude If you really are hard up for some sound I have a fmf silencer off my 400ex I'll sell ya cheap..Its thrashed and its stuck on the stock header pipe but it works and you can repack it..The pipe can be taken apart so you can use your header..This one is crusty.Pm me for more info..

[threewheelin-feelin]

i would reconmend buying a pipe fmf big gun cobro something so trailprotrailpro bike dont get mest up and its all legal

[atcpunk107]

hey, in the back of the pipie their are three bolts, take them off and i beleive you can take out the baffeling from their. i ride a frends 02 400ex all the time and i think it sounds good as is, a lil quiet though.

[WannaRace400ex]

Yeah I took the chrome piece off and cut the entire baffold off, and put the chrome piece back on. STILL NOT LOUD ENOUGH!
Thanks Eric

[ATC crazy]

Here's what you can do to have the bast of both worlds. Get a White Brothers E-Series slip-on muffler, and then go get the Snuff-R-Not end cap for it. With the end cap, one turn of an Allen wrench and its straight through flow, which is very loud. BUT it still has backpressure so you wont hurt your engine. Give the end cap another turn and the muffler performs like any other....it lets the exhaust gases pass through the muffler, and out the tuning discs. It is still pretty loud...trust me.

Run it fully open when you are away from people...but when you get near a house/road/person/etc... you'd better switch over