an overide is great for drag racing once you get on to it.as lowrider said ,don,t back load the tranny by letting off the throttle with out squeezing clutch first,doing so will cause bent shift forks.however i run a 1-5 overide done by rudy kurtz and he told me its ok to back out of throttle in first gear and he also recommends backing out of throttle in fifth gear before squeezing throttle at high rpm's to prevent damage to clutch componets.never downshift the gears without stopping first.if it is a 1-? , there should be a spring with it that goes on the shaft between first gear fork and the case to keep it from jumping into gear by its self when its running.never rev the engine with clutch released as it could jump into gear without warning.due to the way the clutch is squeezed at times at higher rpm's i also recommend installing the bearing kit in the clutch to help prevent welding the clutch adjuster,ball and pushrod together.i'm speaking from experience on this because i've had these parts weld together and it aint a good thing.