How to check compression?

apaseman

Petty Officer 3rd Class
Joined
Feb 9, 2010
Messages
93
Is there any easy way to check an outboards compression or does one need a special device?
 

JoLin

Vice Admiral
Joined
Aug 18, 2007
Messages
5,146
Re: How to check compression?

Just a regular old compression tester that screws into the spark plug hole. If you know how to do a check on a car, you know how to do it on an outboard. If you don't, write back and we'll help you out.

When you get results. if you aren't sure they're good, post back with make, model and year in the appropriate engine forum and folks there will help you decipher the numbers.
 

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,201
Re: How to check compression?

just make sure to ground out the spark plugs or disconnect the ignition. lots of ways to destroy various parts with an open ignition circuit.
 
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