the zilla .020 over is a 505cc im a machineist i know these calculations

 

All I can say is other then a DG pipe, reeds, and a twinair filter with no lid my engine, swingarm, gearing, is all stock and we clocked mine on pavement at 91MPH with a 1998 Jetta GT with stock size rear tires so i dont know whats making mine so much faster but It seems your bikes must be out of tune in some way or another. Mines for sale for 3 grand if anybodys interested

 

the zillas are awesome...i dont see how a raptor beat it