Compression Low??

deltaking

Cadet
Joined
Aug 17, 2008
Messages
15
89 Johnson 110HP V4: I just checked my compression because could not get the engine to start. At cold engine, it is about 90psi +/- 2 on all cylinders.

1. Is this considered low?

2. If I were to be able to start it and warm it up, would the compression change?

Most people here talk about 100-120psi. Thanks.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: Compression Low??

what were the other 2 ? no need stroke can be taken cold. the main thing is they are equal with in 10%.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Compression Low??

Your compression is fine, king.

Go to the Engine FAQs and do "Outboard won't start" to find out what is wrong.
 

CharlieB

Vice Admiral
Joined
Apr 10, 2007
Messages
5,617
Re: Compression Low??

Some engine series came with only 90 PSI compression.

Search this site for 'Won't start' or engine won't start, you should find a series of directions of how and what to check to lead you to your solution.
 
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