OS 1.20 FS Poor Performance
I have a 1.20 FS that is only putting out 8200-8400 rpm on a MA 15x8 prop. I have replaced the bearings, piston ring, gaskets and set the valves to spec. Compression improved but maximum rpm still is below what I would expect. My understanding is I should be getting 9,000+ but not even close. The engine is 10 years old but with the rebuild last year, it should be as good as new.
Am I missing something or is that as good as I can expect?
Thanks.