can you run w/o muffler
Honda-Tech Member
Joined: Jan 2002
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From: Las Vegas, NV. USA
Re: can you run w/o muffler (kpxgq)
aaah don't do it, i was at a race not too long ago and on one of the bikes(a kawasaki) the pipe fell off(just the pipe) and it was deafening even from about 200 feet away 
plus i don't think its good to take your exhaust off, you wont get any back pressure
plus i don't think its good to take your exhaust off, you wont get any back pressure
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Re: can you run w/o muffler (kpxgq)
would it be possible?
i want to try it just to see what it sounds like
i want to try it just to see what it sounds like
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Re: can you run w/o muffler (kpxgq)
It will probably run, it will definitely be loud as hell. Probably bearable idling in the driveway if that's all you want to test, but the minute you put a load on it, it will be obscenely loud.
Also, it will run poorly since the bikes are so well tuned they are very sensitive to any changes in breathing. You will be reducing the back pressure and throwing the air-fuel ratio lean. Many people have to (or should) re-jet when doing just a slip-on, which is effectively what you're doing (lowering back-pressure).
Also, it will run poorly since the bikes are so well tuned they are very sensitive to any changes in breathing. You will be reducing the back pressure and throwing the air-fuel ratio lean. Many people have to (or should) re-jet when doing just a slip-on, which is effectively what you're doing (lowering back-pressure).
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From: JAPAAAAAAN
Re: can you run w/o muffler (XrcR6)
yeah, just get the carb setting right, and i dont see any reason why you will lose power. Oh, btw, the jetting changes probably about every 3 to 4 months due to humidity, depending on the place you live, if you want to get picky. it might idle good one day, but it might not the next day.
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From: Wilmington, NC, US
Re: can you run w/o muffler (Raz1983)
with NO backpressure you would most likely burn up your valves... that's what I've learned from car's and ATV's anyway. It would surely be unbearable.
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Re: can you run w/o muffler (SlprTeg)
yes you can run a bike without a pipe on. it will start up fine and you will ride along fine.
i had to take my pipe off to remove a bolt on the passenger peg that was stripped. I drilled it out but had no pipe. Had to ride to the store on the other side of town to get there.
well, bike rode the same as with the pipe on. wasnt weaker, didnt take off slower..nothing. it was a lot louder though.
hell race pipes are almost nothing but pipe and a baffle to absorb a little sound thats it.
woudl i do it normally, no..what for.???
want to see what happens..just try it out...
i had to take my pipe off to remove a bolt on the passenger peg that was stripped. I drilled it out but had no pipe. Had to ride to the store on the other side of town to get there.
well, bike rode the same as with the pipe on. wasnt weaker, didnt take off slower..nothing. it was a lot louder though.
hell race pipes are almost nothing but pipe and a baffle to absorb a little sound thats it.
woudl i do it normally, no..what for.???
want to see what happens..just try it out...
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Joined: Apr 2001
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From: Wilmington, NC, US
Re: can you run w/o muffler (SlprTeg)
you idiot, you can only burn valves if your exhaust pipe is too short. I'll explain it to ur dumb ***...
All engines have some valve overlap, therefore some exhaust gases are sucked back into the combustion chamber. If the exhaust pipe is too short, some of the hot gases escape and some cold (ambient temp) air ges sucked in. When the colr air hits the back of the valve, it cools it... creating a cooler backside and a hotter bottom side which will warp the valve. Everntually it gets so warped that exhaust gases can leak out, even when the valve is closed. The points where the exhaust gases leak gets real hot when the ho gases escape quickly thru it, thus burning them up.
So basiclly, unless the pipe is super short.. you wont burn any valves. If you're worried, weld/strap on a pipe of equal length to ur tail pipe.
Oh and no back pressure is impossible unless the exhaust piping diameter is greater than the total diameter of the exhaust valves...
[Modified by SlprTeg, 12:05 AM 4/30/2002]
All engines have some valve overlap, therefore some exhaust gases are sucked back into the combustion chamber. If the exhaust pipe is too short, some of the hot gases escape and some cold (ambient temp) air ges sucked in. When the colr air hits the back of the valve, it cools it... creating a cooler backside and a hotter bottom side which will warp the valve. Everntually it gets so warped that exhaust gases can leak out, even when the valve is closed. The points where the exhaust gases leak gets real hot when the ho gases escape quickly thru it, thus burning them up.
So basiclly, unless the pipe is super short.. you wont burn any valves. If you're worried, weld/strap on a pipe of equal length to ur tail pipe.
Oh and no back pressure is impossible unless the exhaust piping diameter is greater than the total diameter of the exhaust valves...
[Modified by SlprTeg, 12:05 AM 4/30/2002]
As you can see from my post, I said that is what I have learned from ATV's and cars. IE. running open header. I know people that have burned up valves on cars running open header and on my scrambler I was told that running open header woudln't be a wise choice since it could mess up my valves. I don't know if there is any truth to that, but that's what I was told. It's a 2 stroke though, so I guess it could be different on a 4 stroke. Sorry if I was mistaken... it's not like I did it on purpose
-Erik
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