Cool I'll try heating the pipe.

Audgidog, use wooden blocks inside and outside the curve, and then bend by hand I assume you mean?

Davidsis, I am talking about simply using bicycle speed to determine RPM. you can do the math...20mph -? bicycle tire rotations per minute, then just divide out the ratios till you get to the crank of the engine. Do this so you can just have your speedo on your bike and know that 20mph = 4k rpm, 25mph = 5k rpm, etc...

anyone know the gear ratio on the crank side of the engine...when I briefly looked at it, looked close to 3:1...i'll pull the cover and count teeth.