Unsticking an unused engine........

This is the 170 Slanty I just picked up a little while ago, would only turn back & forth ~1/4 turn after squirting some WD40 in the plug holes;
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Pull the covers & rocker shafts, be certain none of the valves are stuck, You No Fuke-arown......
And I prefer rare-earth razorbacks to find rust-truffles.....