I've heard of some guys swapping out 400EX bottom ends to get electric start, but that the gear ratio is different and it also has a reverse gear. How exactly does the reverse gear work? Does it replace 1st with reverse, like you click down to go into reverse? How different is the gear ratio? Good/bad for street use? Thinking of doing a big bore and either swapping in a 400EX bottom end or just the crank part.