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100psi and 150 psi
- Thread starter 519bryguy
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Something has gone wrong in the top end and unfortunately it's time for a rebuild. At the very least you will have to rebuild the top end, but you'll want to have a look at the bottom as well while you have it a part. That's about all I can tell you (I'm the Mercury guy:rofl
, but there are lots of knowledgeable people on the forum that will be happy to help you along the way.
Aaron:cheers:
, but there are lots of knowledgeable people on the forum that will be happy to help you along the way.Aaron:cheers:
Here is some information on a compression test...
Here is the correct info on a compression test. It covers all the basics, just to be sure.
To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression gauge, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot then there is a problem. I hope this helps you.
Let us know how you make out.
Karl
Here is the correct info on a compression test. It covers all the basics, just to be sure.
To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression gauge, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot then there is a problem. I hope this helps you.
Let us know how you make out.
Karl
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