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Discussion Starter · #1 ·
Anyone know what would cause low compression other than worn piston rings?

I have a 96 zx9r motor that is running like crap. I did a compression check and according to the service manual it should be between 139 - 215 PSI. I am getting 90 PSI on cylinders 1 and 2, 120 PSI on cylinder 3, and 180 PSI on cylinder 4.

I plan to pull the motor apart and change the ring since they are cheap, $40 a set, but I would like to know if any of the valve may contribute to this issue so that I can get it fixed while im in there.

Thanks
 
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