Earth Surfer

Yes also. A good pipe is the #1 single bolt on item for performance you can buy for a two stroke engine.

Badz--I say the CY29's don't rev as high as other engines from the testing I did on peds with me on the ped (220 lbs at the time--I lost some since then), and I tried like heck to get more RPM without losing the good low end it has (with porting and ingition timeing changes only though). For many peds, we have a spindle that is bolted on the crank, and runs right on the tire (direct drive--no clutch--will stall when stopped), so we can change spindle diameters for a gearing change. I run the smaller spindles which tent to rev higher than taller gearing--I only got about 15,000 RPM out of the head kit version and about 16,000 out of the non head kit version (using the higher reving S1 pipe). I could get it higher--but the low end was suffering, and that was the good point of that motor when it came out. Carb tuning was set with a good spark plug color, but they might have reved a bit higher if I went a little more lean. Everybody in the ped racing world knows the engine does not rev as much as other engines (but it has better low and mid than most of them) and I don't think anybody in the faster classes will use that motor. Now, on a RC car, it will rev higher I am sure because the load is lower--but so will all the other engines.