I installed new magnetos for my 21.5 HP Craftsman rider. They do not fit as close as the originals and I cannot get them closer than about 1/8". The old ones were much closer..probably 1/16". My question: can this cause the mower to not turn off when key if turned OFF? It doesn't sound like it would, but it never did this before. (12 years old). I have been shutting it off by just getting off the seat, which shuts it off. Would suspect the key module? Thanks for any opinions.