thank you 125cccrazy
so here is the deal.
i recently purchased 3 new in box 6hp B&S vanguard engines for $140 total. each engine has a 5/8" shaft, the last inch of the shaft is threaded. so i plan on machining the key way into all 3 shafts (i have a jig and dremel).
so i was wondering about what length of key way is required for my clutches.