1990 Johnson 70 hp compression?

M

My Limit

Seaman Apprentice
Joined
May 19, 2005
Messages
37
My friend has a 1990 Johnson 70 HP motor with three cylinders. They tested out at 115, 115, 116. <br /><br />I know they are close and that's good. I just want to make sure they are high enough.<br /><br />Anybody know if that sounds right?<br /><br />Thanks,<br /><br />ML
 
D

duke3

Petty Officer 2nd Class
Joined
Jun 30, 2005
Messages
108
Re: 1990 Johnson 70 hp compression?

Hey ML<br /><br />Your friends Johnson, is in good condition, according to the comp.test.<br />If lower than 100 PSI, then the motor needs to be overhauled, and also if there is a diff. more than 10% in comp. pressure from one cyl. to another.
 
M

My Limit

Seaman Apprentice
Joined
May 19, 2005
Messages
37
Re: 1990 Johnson 70 hp compression?

On a side note. If an outboard motor has high enough numbers but they are staggered is that ok? As long as the bottom number is within 10% of the top? Why would they be staggered rather than close?<br /><br />Thanks
 
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