Top end rebuild or replace engines?

[ronmold]

97' speedster w/720's. both engines are running poorly, L doesn't idle well and R has little power until I get on plane and then it gets going. Compression check shows 95 to 103 Lbs. which I believe should be much higher. I'm wondering if a top-end rebuild would do the job or after 20 yrs. is the lower end about done also?

 

[mwat65]

Total rebuild is always better. Tear it all the way down and inspect crank. I guess it comes down to your budget. A new topend could get you by for a couple more years or longer if your crank is in good condition. 150 is good compression . Anything under 125-120 it’s rebuild time. Also better find what caused the problem to begin with. Most likely fuel system