I have a Simplicity lawn tractor with a 20 HP twin valve that has zero compression Not a stuck valve

Question

It runs but it runs rough. Could it be the head gasket?

Answer

Hi, it could be a Head gasket or it might be Worn piston rings.Thats all I can think of ; Good luck. OOOHHH yeah , if the piston rings are wore The engine exuast will be very smoky

I have a Simplicity lawn tractor with a 20 HP twin valve that has zero compression Not a stuck valve

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