Johnson 185 hp compression values

[JoeBlow]

Can anyone tell me what the cylinder compression test results for a Johnson<br />185HP VRO (1984) should be.<br /><br />I have scores of<br />cyl 1 - 84<br />cyl 2 - 90<br />cyl 3 - 91<br />cyl 4 - 89<br />cyl 5 - 90<br />cyl 6 - 91<br /><br />They seem low to me?<br />This would be much appreciated,<br />JB

 

[DJ]

Re: Johnson 185 hp compression values

Joe,<br /><br />They seem low to me too. Is this the 185 on ebay?<br /><br />The compression should be checked with the throttle wide open. Perhaps that is why they are low.

 

[JoeBlow]

Re: Johnson 185 hp compression values

Nope, but you caught my curosity so I had a look at the motor on Ebay. Interesting all compression results were around 80 PSI for that motor. I am wondering if the older OMC V6 motors had lower compression than most motors. Anyone know if this is the case?

 

[JoeBlow]

Re: Johnson 185 hp compression values

I just read on that guy's Ebay ad that these engines indeed did have lower than normal compression and that 80PSI was normal. Hmmm