briggs and stratton revving too high?

I have a craftsman mower model 917-388834. last year I had someone fix it and it worked fine but now this year its revving too high. when I look at the governor spring it looks like its too large because its wrapped around a couple of times. seems like the "mechanic" charged me for new parts but just used what he had around and just rigged it. Where can I find a parts list and diagram for the governor assembly springs and linkage?