Compression readings are about 90 on all three cylinders in my 96 Yamaha 75hp. Other than running a little rough when idling in gear, the engine is very fast, has great acceleration and starts right up. Therefore, I don't want to spend any big $ at this time to fix. Is it possible that the head gasket is bad or that the problem may be something other than needing new rings? Is this something that I check? Thanks.
