GrindKore
Petty Officer 1st Class
- Joined
- Jun 20, 2008
- Messages
- 211
I just did a compression test on my 1990 FORCE 90 and got following readouts:
Cylinder #1 (top): 56psi
Cylinder #2: 127psi
Cylinder #3: 125psi
The thing is, this motor starts easy, idles well, and gives me descent WOT speed (about 34MPH). The only reason I started poking around with compression was after I installed the tach gage and realized the RPM at WOT is only 3900RPM.
Currently I'm running sea-foam through it hoping carbon buildup on the rings is causing this. However, I'm sure that will not solve my problem. My question is, can a motor with a blown piston perform so good that otherwise I would never suspected any problems?
Also If I take off the cylinder head bolts and remove the plate to inspect cylinders, will I need to replace the gasket?
Cylinder #1 (top): 56psi
Cylinder #2: 127psi
Cylinder #3: 125psi
The thing is, this motor starts easy, idles well, and gives me descent WOT speed (about 34MPH). The only reason I started poking around with compression was after I installed the tach gage and realized the RPM at WOT is only 3900RPM.
Currently I'm running sea-foam through it hoping carbon buildup on the rings is causing this. However, I'm sure that will not solve my problem. My question is, can a motor with a blown piston perform so good that otherwise I would never suspected any problems?
Also If I take off the cylinder head bolts and remove the plate to inspect cylinders, will I need to replace the gasket?