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optimally at least 100 psi on each cylinder, but the most important thing is that both cylinders are 5% within each other.
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∙ 10y ago
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What should the compression pressure be on a 8hp mercury outboard 2 stroke?
185psi
What should the compression be at on a 150 hp mercury outboard motor?
I should be equal on all cylenders and about 110 to 120
What should the compression be for a 50 hp 4 stroke Mercury outboard motor?
125 is the least
What should the normal compression be on a 1997 Johnson 15 hp outboard motor?
between 90-120
What is the cylinder compression for a 2003 90 hp mercury outboard?
I have a 2005 and compression should be close to 120 psi. Normally a good engine will have compression between 115 and 130 psi but a leak down test should be performed also to know the full condition of a cylinder.
What is the cylinder compression for a 1999 135hp mercury outboard?
should be at least 100 PSI and the difference between cylinders should be less than 10% of each
What is the right fuel mix for a 2 stroke outboard motor?
99% of the outboard motors need 50:1
Fix low compression in outboard motor cylinder?
You have to take out the cylinder, how low is it, what is the difference
Hi you have an older ted Williams 7.5 horse outboard engine and you need to know what the compression should be or close to be?
A 7.5 hp outboard will need around 90 - 100 psi of compression to start up and run. Anything over this pressure is a bonus. Also, you want there to be no more than 10 - 15 psi difference between cylinders.
What is the engine compression specification for a 1989 Evinrude 110 hp VRO outboard motor?
110
What is compression of a Johnson outboard?
at least 100 PSI and no more than 10% between cylinders
How do you fix a cylinder with low compression on an outboard?
This all depends on why it has low compression. If the rings are worn out, the motor should be rebuilt. If one of the valves is bad, re grinding it or replacing them is the fix. Perform a cylinder leakage test to confirm it. You will probably need to take it to a shop for this, but unfortunately, there usually are no quick fixes for low compression.
