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Old 03-07-2010, 09:20 PM
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diceman2004 diceman2004 is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: Kitchener , Ontario
Posts: 568
Default Re: carb as a muffler?

i have 2 friends that used to drag race motorcycles ( i wont give up their secret ) but they would argue quite convincingly against having zero back pressure , even an oversized unrestricted header tube adds back pressure , and every bend in the tube also adds back pressure . Burnt valves come from running lean ( fuel-air ratios )

generally speaking , a short pipe will give you more bottom end and a long pipe will give you more top end power

every setup needs proper jetting for optimal performance .

i totally tore down and rebuilt my yamaha roadstar engine myself to repair a faulty stator shaft . i run a wide open k&n intake , ported my own rubber intake manifold , and run a 3 inch exhaust . i do my own jetting . I USED MY BUDDIES SECRET and i added more power , and increased my mileage by 75 km per tank
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