| | | Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles | 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 ...  | | 
03-27-2008, 04:57 PM
|  | Moderator | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
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| | Re: Quieter muffler? Quote:
Originally Posted by SeattleMike 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.
__________________ If it ain't broke, and you mess with it long enough, it will be. | 
03-27-2008, 05:30 PM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008
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| | 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. | 
03-28-2008, 05:29 AM
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| | 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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03-29-2008, 07:39 AM
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Posts: 1,701
| | 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 | 
03-29-2008, 07:41 AM
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| | Re: Quieter muffler? Quote:
Originally Posted by SeattleMike 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  | 
03-29-2008, 09:11 AM
|  | Senior Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Seattle, WA
Posts: 67
| | 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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03-29-2008, 09:18 AM
|  | ADMINISTRATOR | | Join Date: Dec 2007 Location: St. Croix, US Virgin Islands
Posts: 1,701
| | 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 | 
03-29-2008, 09:45 AM
|  | Moderator | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 2,998
| | 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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03-29-2008, 10:40 AM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,370
| | 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. | 
03-29-2008, 10:48 AM
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| | Re: Quieter muffler? BGJ beat me to the Googlizer. Put you get the point!  | | Thread Tools | | | | Display Modes | Linear Mode |
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