Do yourself a favor and find a good machine shop and have them do the work. Most definitely get the crank measured if you can’t do it yourself. The last one I took apart was .008 out of round on the rod journal. Yes these little engines are expensive to rebuild but in the end it will be worth it. Any automotive/performance shop should do the work or be able to direct you to a shop that will. If you’re really desperate I can give you an address to the shop I use. Last one got crank turned,bored,guides,and seats ground to match the new valves for around $250
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