Good compression ?

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    Posted: 26 Feb 2020 at 5:54pm
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G’day

I was wondering what you guys would consider decent compression for a 1998 Johnson 90hp ?

Cheers
By the power of Greyskull
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2020 at 6:17pm
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Titanium
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1st make sure measure correct.
2005 manual
" 1/ run out board till full operating temp reached, shut down
2/disconnect crank shaft position sensor
3/move throttle linkage to WoT
4/ turn over on starter measure max pressure on each cylinder

Sry cant find pressure specs.. I would think around the 115lbs ???.. Thu what looking for is difference between cylinders. Anything over 10/12% indicates something wrong.

Also a engine that has a build up of carbon in the chamber has a higher compression, assuming that the rings etc in good condition .. hence why looking at the variation.

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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2020 at 6:56pm
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What were your results Judo?
Best gurnard fisherman in my street
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Post Options Post Options   Likes (0) Likes(0)   Quote Judokapont Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2020 at 7:33pm
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Thanks for the reply Steps and Smudge

I had my outboard serviced and on the report it says
1) 125
2) 120
3) 125
4) 120

Cheers :)
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 27 Feb 2020 at 8:54am
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I would be very happy with that.
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Post Options Post Options   Likes (0) Likes(0)   Quote Judokapont Quote  Post ReplyReply Direct Link To This Post Posted: 27 Feb 2020 at 12:56pm
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Excellent news , thanks Steps
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Post Options Post Options   Likes (0) Likes(0)   Quote Nickb1 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2020 at 8:09am
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the biggest thing is that you don't want a big variation between them.
5 ether way is fine but if you had 1 cylinder showing 107 lets say, that could indicate an issue.
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