Thank you for clarifying, Al. I was thinking four strokes when I wrote that.
>
> 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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