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Old 05-27-2011, 11:18 PM
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Pablo Pablo is offline
Master Bike Builder & Forum Sponsor
Join Date: Dec 2007
Location: Duvall, WA PNW
Posts: 3,649
Default Re: Well I just had to say this and see if anyone else has experienced this

I know you are not running a stock exhaust. I read that. I was writing in general terms for the general reader.

Here's a conceptual view of what I think you are experiencing. At low rpms BEFORE an expansion chamber can have full effect, it is possible that a straight larger diameter pipe will produce slightly more power. Especially detectable in a single speed bike. Now there is no way physically such a set-up will produce overall higher peak power within the most efficient powerband of a 2-stroke engine. In such a situation it would be basically trading off a nice torquey mid-high peaky on pipe powerband for a slightly more torque in an RPM range where the engine is not the happiest. This of course would not be a good choice for a bike with gearing where one could match that power band as needed with gears.
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