I have a good 4 horse Briggs that came off a tiller. I am going to put it on my CAT 250X that I am piecing together. I plan to paint and detail it and add the 3HP stickers so that it looks "correct". It has the correct diameter shaft but it is a little short. I don't remember how much... I will have to measure it again. I was thinking about just turning a short piece that would fill in the length and bolt it together. What do you guys think? Good enough for a stock, mostly display if not just display bike? Display or not chances are it will get tested out a little..... I cant see the added effort to change the crank for this bike. It is waaayyy to small for me or the wife to ride. We are both tall... Thanks for the input.