Thoroughly clean all the engine parts, especially inside the crankcase. cylinder wall, and piston/rod. Triple check all the engine parts for damage, and debris! A good method to clean the engine is to soak it in a bath of hot antifreeze. You can also soak it in Berryman B-12 Chemtool as well. Cleaning in antifreeze is much safer than using solvents and does just as good of a job.
Specific things to look for before you re-assemble your engine:
It's time for INSPECTION to determine IF the engine is even worth overhauling. The primary determining factor will be the piston & sleeve assembly. They are the single most expensive components in your engine (generally half the price of a new engine). If piston & sleeve are damaged, there's not much point in continuing the overhaul.
For the most part... this engine is history. The impact damage on the piston renders the "piston to sleeve fit" ruined and will not hold compression. Also, the deep scratches on the piston skirt allows the compression to leak here as well. This engine would normally end up in the spare parts box, however the sleeve is in excellent condition. So, I will do some very fancy machine work on the piston & head to restore them to original condition in order to continue this project. FOOT NOTE: Since I will be investing lots of machine time on the piston & head, I may as well make a "hardcore" racing engine out of it. The piston will be resized and hand-lapped to the cylinder. I will re-time the intake on the crankshaft and raise the exhaust port in the cylinder 20 degrees.
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