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8N compression values

90psi is said to be the lowest for one to run well. But if you took your readings with a cold engine your numbers will be off. Also more info needed to help you figure out why your numbers are so low. I've had engines with low numbers that after letting ATF soak in the cylinders for a week they came right up to where they needed to be
Hobby farm
 
It was a cold engine that has not been run in a long time- just retreived from years of sitting, and I'm trying to get her running. So I guess it's too early to worry til I get spark and fuel working right. If it still won't run after solving those, I'll post again.
 
First question is: have you checked the pressure guage?

Next is exactly how did you test it?

Next, did you do a 'wet' test? following the 'dry' test.

Next, is this a running engine or has it been standing a long time?

Next, did you remove all spark plugs, hold the carburettor butterfly open and make sure the choke was free?

Is the starter turning it fast enough?

Next, are the valve clearances OK?

Next, how even were the results for each pot?

So you see, just saying they are low may not mean a great deal as we don't know any relevant detail.

Personally, I reckon they are higher than you are telling us. The reason for this is that usually there is a large variation on a worn out engine (from pot to pot). Compression tests indicate several possible faults and you have given little information, as to how the pressure rises, differences, actual values, so we could not comment on valves seating, rings or gasket faults.

Regards, RAB
 
Well since it has sat for a long time I would go ahead and fill the cylinders with ATF and that way while you take care of the other stuff it will loosen up the rings and valves and clean the cylinder so it might just start when you have the spark and carb problems fixed
Hobby farm
 
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