This may be what you do not want to read! Go to more places and find a engine that looks like it has been treated well and has good compression. You do not want to waste time on one that has a scorded piston ect. Find one where the ignition went bad or whatever. You should be able to find several engines and use only the better ones. Maybe the one you have is ok...but the engines I found like that one was not any good, except for parts. I always take exhaust off first to see how the piston and cylinder looks. Some I junk right there. Do not urn a engine over if it seems sticky....take it apart and find out why. Maybe others can chime in and give you more hints, in the process. Best Regards, Capt,n