Hikinghome Posted May 21, 2018 Share Posted May 21, 2018 Learned a very expensive lesson Always make sure you have the correct spark plug fitted! where I can get a replacement piston and barrel for a Fly Evo 100 motor Please check to photos Really appreciate any help Thanks Quote Link to comment Share on other sites More sharing options...
notch Posted May 21, 2018 Share Posted May 21, 2018 (edited) Your spark plug being to hot or cold won't do this. Instead - its either: old fuel with no octane rating left an air leak in the crankcase (sometimes around base gasket - were the head bolts loose?) a carb issue, e.g. blocked jet, not enough fuel getting through, running lean. blocked tank vent, air leak in fuel line etc (again lean issue) too advanced ignition timing - did the rotor slip on the crankshaft? compression too high - no base gasket etc. Can see one in your picture though. one of the above has caused detonation and overheating. Edited May 21, 2018 by notch Quote Link to comment Share on other sites More sharing options...
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