Originally Posted by Scotty
I ran this engine on one of my prototypes, they are more powerful than the 49 china as they have full bearing construction and run reed valving. I ran a jackshaft and managed 50 mph top speeds. This requires disk brakes and a strong frame. I found out the hard way that a bike frame is not up to the stress of this kind of speed.
I have just modified the motor for ethanol/castor mix (as I can get pure ethanol from work), I raised the compression, hotter plug, drilled the jet out to 1mm and i'm trying to adjust the timing now. I would like to fit it to the next build, a bmx framed cruiser.
Got any pictures you would'nt mind to share the design of your engine mounts and jackshaft...
Did you use 25H chain or just BMX chain or 415 chain?