your theory of being all the bike is far from the truth.i speak from experiance.i have got a 75 hp. shee but in the first time i dragged her against a piped banshee,i lost two out of tthree times.why because i couldnt get any traction on it.but the third time i hung my ass over the rear tires and hooked up to kill him by 10 bike lenghts.like the other guys said,missed shifts,rider error plays a big difference in dragging.look at top fuel dragsters,they all have there days of winning and losing because its 50% engine and 50% driver.end of story