JCM6767
CB750 New member
I just bought a 79 CB750L and found out that the compression is low in all cylinders. 1, 2, and 4 were at 60, 3 was 90. Bikes turns well but will not start. Valves clearances are within spec (recent)
They guy who tested it told me the rings were bad but didn't do a test with oil.
Me being me, I took the engine out and proceeded to take the head off but am running into a slight issue. The valves seem to be stuck on the cylinder head. I've broken the gasket seal, it moves freely on one side and about .5mm on the other. I am assuming the guide pins are rusted/binding and I've put some PB blaster in and am letting it sit. Any suggestions on how I can leverage? I'm not a fan of using too much force, just don't want to cause any damage.
This is the first time I've gone this deep into an engine and from reading other posts I can see that the compression test with oil would have been a smart move. Since that's not going to happen at this point, can anyone point me in the right direction to inspect the valve, seats and etc...
Thanks in advance.
They guy who tested it told me the rings were bad but didn't do a test with oil.
Me being me, I took the engine out and proceeded to take the head off but am running into a slight issue. The valves seem to be stuck on the cylinder head. I've broken the gasket seal, it moves freely on one side and about .5mm on the other. I am assuming the guide pins are rusted/binding and I've put some PB blaster in and am letting it sit. Any suggestions on how I can leverage? I'm not a fan of using too much force, just don't want to cause any damage.
This is the first time I've gone this deep into an engine and from reading other posts I can see that the compression test with oil would have been a smart move. Since that's not going to happen at this point, can anyone point me in the right direction to inspect the valve, seats and etc...
Thanks in advance.