Dave,

I have an older YS120SF (bought used) that I would like to get some advice on. The engine does not seem to build pressure in the fuel tank to nearly the level that my 140L does. Is this normal or is it a sign of something else wearing. The tank holds pressure fine for 15m+, so I am pretty sure that I do not have a tank or check valve problem. What else would this be indicative of? I have replaced all the gaskets with Leak Frees, so I do not think that is a problem. Compression seems OK, but would this happen if there were blow-by on the down-stroke by the ring? I do not think I am getting quite the power as others are either when I compare to posts here. I had written that off to high altitude, but maybe it isn't. Anyway, thanks for your time.

Dale