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Quieter muffler?


Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. Originally Posted by SeattleMike Do 2 strokes usually make noise because of sound going out the airbox? Sometimes, half the ...
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Old 03-27-2008, 04:57 PM
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Default Re: Quieter muffler?

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Originally Posted by SeattleMike View Post
Do 2 strokes usually make noise because of sound going out the airbox?

Sometimes, half the sound you here can be intake sound.

Bigger, baffled boxes are pretty quiet.
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Old 03-27-2008, 05:30 PM
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Default Re: Quieter muffler?

Just get the right size "rad hose" that slips over the carb and hose clamp it in place. If you really take your time, you will find one with all the right curves in it so that it leads under your seat. Most if not all motercycles use this method with an air box under the seat or gas tank.
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quieter-muffler-2007_uni_air_filter_6_inch_two-stage_pod_air_filter.jpg  quieter-muffler-air-20filter.jpg  quieter-muffler-kn77_3.jpg  
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Old 03-28-2008, 05:29 AM
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Default Re: Quieter muffler?

That would be a pretty small radiator hose, but I get the picture.

Any airfilter is better than what we have fo' sho'!
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Old 03-29-2008, 07:39 AM
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Default Re: Quieter muffler?

48mm is what you need for size for air filter. i got one of the cone ones but it will not fit in the small space i have. you need about 4" clearance behind the carburetor
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Old 03-29-2008, 07:41 AM
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Default Re: Quieter muffler?

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Could you post or email a picture, or more info on this quiet exhaust setup? I'm interested in making one myself, or buying one from someone.
sorry mike didn't see your post. this is the one norman and bob made for me and it is awesome. for in the neighborhood if you do not open it up you cannot hear the exhaust over the engine. it is that quite. you open it up and it has a nice deep sound and not the weedeater sound. here is a picture of the pipe

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Old 03-29-2008, 09:11 AM
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Default Re: Quieter muffler?

Thanks for posting this pic Cruiser, its nice to know that there is a setup that reduces noise but doesn't reduce power much. I am a bit irritated by the telltale noise of the 2-stroke, it's loud!

I don't have a great grasp on 2-stroke exhaust technology, I don't fully understand the benefits of the bladder-like setup and why the pipe diameter sometimes is reduced. Does anybody know a website that explains this, or know of a good book on 2-strokes?

I'm working on creative ways to modify my air intake right now, I'll post a pic when I get it setup.

Last edited by SeattleMike : 03-29-2008 at 09:16 AM.
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Old 03-29-2008, 09:18 AM
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Default Re: Quieter muffler?

the pipe actually increased the power on low end big time and top end it increased about 3mph. i am really happy with it. norm and bob are awesome
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Old 03-29-2008, 09:45 AM
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Default Re: Quieter muffler?

I don't have a great grasp on 2-stroke exhaust technology, I don't fully understand the benefits of the bladder-like setup and why the pipe diameter sometimes is reduced. Does anybody know a website that explains this, or know of a good book on 2-strokes?



two stroke tuning - Google Search
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Old 03-29-2008, 10:40 AM
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Default Re: Quieter muffler?

I now want to start opening my bike up a bit!

Air Intake: 48 mm = 1-28/32" - hmmm what have you found that fits this? Or is it easier to adapt up to 2"? And what the heck do you clamp to - the flange on the carb is tiny?

Exhaust: I REALLY want a pipe like cruiser's for better low end grunt and top end flow, the chamber allows pulses to work for your engine.

How Two-Stroke Expansion Chambers Work, and Why You Should Care.
Dan's Motorcycle "Two Stroke Motorcycle Exhaust Pipes"

I was looking at the DAX $19.99 HiPo exhaust as well. I may drill/cut my current set-up, just for fun.

Noise: My exhaust is sorta noisy when standing by and revving it, but not really THAT loud when buzzing by. OTOH it isn't the silent beast either. A chamber pipe with an exhaust tip would be the best of both worlds, IMHO.

Noise II: I've got some sound deadening stuff for the clutch chamber and some silicone rubber tubing hunks to form fin sound deadener.
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Old 03-29-2008, 10:48 AM
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Default Re: Quieter muffler?

BGJ beat me to the Googlizer. Put you get the point!
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