Can it damage the motor if I ride with a straight pipe? (or my improvised muffler)

JJ1

New Member
Mar 22, 2017
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Rockford
I have been riding my motorized bike around with no muffler, just the pipe. Is this dangerous? Also, here is what happened to the muffler and here is my provision. I literally took some soda cans and sliced them in layers, then I put some pipe clamps around it. The whole point was to create back pressure, not muffle the sound.

PICS:
actual bike pic 1: http://i.imgur.com/Nrk6rjW.jpg
actual bike pic 2: http://i.imgur.com/MLSGx34.jpg
muffler that fell off: http://i.imgur.com/SF4rEav.jpg
improvised muffler: http://i.imgur.com/ex3e6h8.jpg
straight pipe: http://i.imgur.com/EOVCug7.jpg
video of running noise: https://www.youtube.com/watch?v=YEcAZ1IGj6E&feature=youtu.be
 

Greg58

Well-Known Member
May 1, 2011
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Newnan,Georgia U.S.A.
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

Other than the noise you can run without a muffler if its jetted right, keep an eye on the plug color to be sure its not too lean. If the engine seems hotter than normal that's a sign of being too lean.
 

JJ1

New Member
Mar 22, 2017
25
0
1
Rockford
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

Thanks for the advice.
 

Tony01

Well-Known Member
Nov 28, 2012
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sf bay area
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

Not dangerous but needlessly loud and weak. 2-strokes need some exhaust backpressure to run good. Also as said above you'll probably have to riches it up a bit.
 

bairdco

a guy who makes cool bikes
Aug 18, 2009
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living the dream in southern california
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

"Losing power" and "2 strokes need backpressure" is a myth, for the most part.

Before some genius came up with the expansion chamber, race bikes ran megaphone pipes. Loud as ****, but on a tuned engine, caused no problems.

"Tuned engine" is the key word. A straight pipe, open exhaust, or megaphone, will run much hotter, so you need to tune the whole system to work. It'll run leaner, so jetting, colder plug, retarded timing (which can't really be done with a stock cdi,) and even fuel mixture must be dialed in for maximum effect.

But on a cheap china, motors often blow up no matter what you do to tune them, so the only real negative effect will be annoyingly loud.
 

BobbyT

Member
Mar 16, 2014
162
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Santa Maria ca.
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

I recommend you get a clamp on expansion chamber,made to clamp to your stock muffler pipe. made by bairdco!
 

ZipTie

Active Member
Jan 8, 2016
750
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Mpls Mn
Re: Can it damage the motor if I ride with a straight pipe? (or my improvised muffler

Thanks for all the help guys. I am going to order this exhaust pipe to replace the missing one, tell me what you think. http://www.bikeberry.com/bbr-tuning...5pNy4_z6D9Mq9oT0ycRzzGkZsWu6YTBEDXRoC9__w_wcB
That's pretty much a straight pipe that will sound almost like your pop can, but worse. Looks cool though. I'd go stock or get a real expansion chamber.but I could be wrong it will be louder with that pipe. Or a long poo poo pipe, they add a tiny bit of torque and a annoying sound too. Some of the stock pipes must have defective welds or your engine mounts are vibrating too much. I've never had one fail...yet...
Murphy's going to get me now.lol