compression

I have a set of 33cc domes with about 2 seasons on them and a set of 35cc domes with about 8 hours on them - both in great condition. 35cc is typical stock-ish motor, higher compression pump gas (91oct) capable domes at sea level. I live in Denver at 5000ft elevation so for me the 33cc domes...

2001 GP800R PV MOTOR. HAVING ISSUES TRACKING DOWN A COMPRESSION GREMLIN. HERES WHAT I HAVE SO FAR. COMPRESSION HAS BEEN TESTED WITH 3 DIFFERENT GAUGES AND THE RESULTS ARE THE SAME WITHIN A FEW PSI DIFFERENCES. FRONT CYLINDER 125PSI REAR CYLINDER 155PSI FROM THE RESEARCH I HAVE DONE 120-125PSI...

So I have been using my friends and other people’s compression testers to test compression on various jet skis over the years but I always end up getting wrong or messed up compression numbers so can one of you guys please explain to me how to do a compression test I now own my own and I would...

So while trying to sell my 650sx this guy came and when he tested the compression it read 90 each cylinder. The weird part is the ski starts right up still has lots of power (for a 650) never had any issues. So could it be a bad tester? Cause I’m assuming with 90 compression it would hardly even...

So I have a 1000cc gp800 stroker with Riva heads Was in a rush to finish the build because of upcoming vacation Get to the lake and take a compression test and have 270 psi in both cylinders on two different gauges I was hoping for about 225 at the most but can’t do anything up here now Anyone...

I've looked through the forums and cant find any solid numbers on this. I bought a used riva head with 31cc domes for my 701 (61x). That would make 110 comp if using the head orings. I need to run pump gas (91 ethanol free usually). Could I run an OEM gasket (.050" thickness) with the riva head...