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Author Topic:   High Compression on 2000 Johnson 130 HP
mb159 posted 05-09-2014 08:55 AM ET (US)   Profile for mb159   Send Email to mb159  
Is there any such thing as compression being TOO high on a two-stroke outboard? I am looking at a 2000 Johnson Ocean Pro 130 HP that shows 140 lbs. on three cylinders and 145 lbs. on the fourth.... Is this TOO much?
Peter posted 05-09-2014 10:15 AM ET (US)     Profile for Peter  Send Email to Peter     
I had a 1985 Johnson 140, V4 Looper and its compression was 130 +/- 3 in all cylinders. The exact number very much depends on the gauge and so I would not worry about the number as it appears to be in range. The more important indicator is how even the compression is between each cylinder and in your case it all looks good.

The V4 Looper motors were known to be good and nearly bullet proof.

crbenny posted 05-10-2014 08:55 AM ET (US)     Profile for crbenny  Send Email to crbenny     
Excessive carbon buildup on piston crowns will raise compression ratio. Due carb and check again.


crbenny posted 05-10-2014 08:56 AM ET (US)     Profile for crbenny  Send Email to crbenny     
Decarb.. Computer corrected me incorrectly.

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