I did a compression test on my 1999 9.9 2 stroke and it was 90-92 psi on both cylinders. That sounds low to me but I've never tested a pull start motor before. Is this low or okay?
I have a pull start Merc 1979 9.8 2 stroke that only makes 76 psi. Sure it is low. Yet it runs well and idles very well for hours on-end while fishing. (trolling). The one thing it seems to struggle with is a cold start. It won’t suck hard enough to pull in enough fuel from the carb. A small squirt of raw gas into the carb, she fires up immediately and runs quite well.
I wouldn’t worry about 90-95 psi. That would be like a new motor to me. Lol. Let ‘er rip!
Thanks all. It is finally running well. It's just been really hard to start. I've learned to not prime it at all to start it. It starts of the first or second pull when cold now. I think the idle is too low when warm. I had a hard time with it stalling when trying to put it in gear.
