1987 225 johnson

N

neader

Cadet
Joined
Oct 5, 2009
Messages
7
Hi: I have a 1987 225 Johnson that has the first three piston's
at 75 psi compression then two @ 70 psi and one at 68 psi the engine is running pretty good but I'am a bit worried about the low compression?



Could someone give me
some info, :confused:
 
Madfisherman

Madfisherman

Cadet
Joined
Jan 19, 2010
Messages
8
Re: 1987 225 johnson

Agreed they are low, but fairly even. Have you tried a de-carb on it?
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: 1987 225 johnson

It could be you have a tester that reads low, try the decarbon as suggested..
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 1987 225 johnson

Those readings are too close together; are you testing with all the plugs out? Is the engine warm? Is the engine properly lubricated? Are you using a screw-in tester?
 
N

neader

Cadet
Joined
Oct 5, 2009
Messages
7
Re: 1987 225 johnson

Yes all the plugs are out and the engine is cold and I'am using a old
screw in tester. Should I run the engine first then test it's compression ?


P.S I haven't used the sea foam yet
 
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