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| High Performance Bicycle Engine Tips We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. |
loud and fast
Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. 2-strokes run best with the *proper* back-pressure.
I've run the bike with just a 4-inch pipe ...  | | 
08-28-2008, 05:30 PM
|  | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,081
| |  Re: loud and fast
2-strokes run best with the *proper* back-pressure.
I've run the bike with just a 4-inch pipe off of the head...it's WAY too loud. 20 min of that will give you a nice headache, and lots of nasty looks from people. |
08-28-2008, 10:31 PM
|  | Motorized Bicycle Apprentice | | Join Date: Aug 2008
Posts: 16
| | Re: loud and fast
so i burned up the nieghborhood today. after the work i noticed a bid difference. i still have some spots of "four cycling" but can usually power through them. i'm giving these mods a big thumbs up. try it yo! |
08-28-2008, 11:03 PM
|  | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Treasure Coast, Florida
Posts: 603
| | Re: loud and fast
Quote:
Originally Posted by Jimmy  Hey guys im new to the site and I was wondering, I know removing the baffle elimanate back pressure but isnt some back pressure necessary for a two stroke to work properly | Backpressure to a point Recharges the spent unburned fuel/ air back into the cylinder for a supercharge effect, return pulse. Thats why when installing an expansion chamber the design and length are best to be matched to the engine size. With less backflow you will get a higher flow, so you may have to change the needle clip setting, watch your spark plug for lean condition. |
08-29-2008, 08:23 PM
| | Motorized Bicycle Apprentice | | Join Date: Jul 2008
Posts: 6
| | Re: loud and fast
running without muffler or baffle do lean the piston and the sparkplug so you will use your piston . ive tried it ... |
09-08-2008, 07:49 PM
|  | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 143
| | Re: loud and fast
Quote:
Originally Posted by NEAT TIMES andrew, could you put a see thru oven door on the muffler, i could cook meals while on the road!!!   | Gives new meaning to "Meals on wheels". ROTFLMO |
09-09-2008, 02:53 AM
| | Motorized Bicycle Apprentice | | Join Date: Jul 2008
Posts: 6
| | Re: loud and fast
Quote: |
Hey guys im new to the site and I was wondering, I know removing the baffle elimanate back pressure but isnt some back pressure necessary for a two stroke to work properly
| I do service and maintence on these motors and I've noticed
on some engines the lack of back pressure due to no or half a baffle
wrecks the piston rings. |
11-15-2008, 05:24 PM
|  | Senior Motorized Bicycle Builder | | Join Date: Oct 2008 Location: Concord NC
Posts: 81
| | Re: loud and fast
Quote:
Originally Posted by rickdiculous so i burned up the nieghborhood today. after the work i noticed a bid difference. i still have some spots of "four cycling" but can usually power through them. i'm giving these mods a big thumbs up. try it yo! | "four cycling" What is this? can someone explain it? |
11-16-2008, 06:35 PM
|  | MODERATOR | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 4,245
| | Re: loud and fast
It's when the engine is too rich and fires every other time...four stroking.
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If it ain't broke, and you mess with it long enough, it will be. |
11-16-2008, 08:42 PM
| | Senior Motorized Bicycle Builder | | Join Date: Oct 2008 Location: Concord NC
Posts: 81
| | Re: loud and fast
Like.....if my carb needle was set on the bottom slot kinda of rich? I think I may have solved my issue tonight. How it got set on the bottom slot, I have no idea, but it was. |
11-17-2008, 05:30 AM
| | MODERATOR | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 4,245
| | Re: loud and fast
Yes, just like that.
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