ORIGINAL: da Rock
ORIGINAL: da Rock
Over lean kills engines.
Don't know of anything else that ruins compression suddenly.
Actually, I do.
Compression happens when the piston is going up and the valves close. It happens from there up. If the piston/cylinder seal is good and compression is suddenly lost, look to the only other seal that has to be intact for compression, the head to cylinder. Head bolts control this. Cracked head? Loose or lost bolt?
Compression also happens on the downstroke but is quite different. Nonetheless, look at the backplate bolts. And you'd still feel the compression of the piston going up.
Sudden loss of compression could be a broken ring or a badly scored piston or cracked head or lost headbolt. Could also be a hole burned in the piston.
[:-] well I have a 2 cycle without valves ,what about the low needle moveing or turning out or in , could this have happened?Ill have to check it >