Hi, don't know if you found your parts yet but I have a stripped ysm8 crankcase in my basement near Atlanta GA. Have some other parts as well, if you're interested call or text 404 291 0875.
I also am looking for parts for a ysb 8. Have attached pic, am looking for the guard that covers the chain going to the manual start cog. any chance you have 1?
__________________
"When i grow up I want to be a sailor, my wife tells me i can't do both"