Actually, as far as 2 strokers go, large diameter pipes give more bottom end torque and small pipes give more high rpm torque. When I rode a Greeves trial s bike it had what was called a "blooy" pipe. It looked like a megaphone but gave gobs of power on the bottom end. By contrast, the Yamaha Ascot scrambler was almost uncontrollable. It had a small, about 3/4" diameter stinger for a pipe. It would double its horsepower over a short rpm range, usually when you were sideways in a corner. It was what we called "peaky".
Al Hatten
'93 Virago XV-1100
VOC #7745
Napa,CA - Wine Country
> That's why bikes with large diameter straight pipes
> usually run poorly at lower RPM -- too little back
> pressure to help with scavenging.
>
>
> J
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