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A few weeks ago I was using the greenmech chipper and it's suddenly started knocking quite badly and chuffing out loads of oil smoke. So I had the engine out, found an inlet valve was stuck open, and corresponding push rod bent. I replaced the valve and push rod and put back together with new gasket set. With the engine now back installed it starts and runs without knocking and all seems fine (runs with no smoke at all) until you get up to the very high revs where it suddenly just starts chucking out massive clouds of blue smoke. This engine has no oil ways through the head so cannot be head gasket, it is now fitted with new valve stem seals, so by my reckoning I have buggered rings? Any advice or experience with similar issue is appreciated, thanks,
