Compression

[macojoe]

what and how should I do a comperssion test on my 1992 Johnson 120hp ??<br />Do I do it with the plugs in or out?? In other words do I take one plug out at a time, or take all out at the same time??<br /><br />What should the compression be in this motor??<br /><br />The reason I ask is I am selling the motor and I have had a few ask. I no how to do it but now sure which way to do it. I have been told to do it both ways?? I am so confussed <br /><br />Thanks all for your contunied help with all my questions!!

 

[DJ]

Re: Compression

Plugs out.<br /><br />Kill switch lanyard, pulled. (ignition disabled)<br /><br />Throttle-wide open<br /><br />Should be within 5-10 psi of each other and close to 100.

 

[Dhadley]

Re: Compression

If the starter wont stay engaged with the other 3 out, put them back in.<br /><br />Good luck!

 

[macojoe]

Re: Compression

Thanks guys!! It is a V4 so I will try all and if I have problem I will put 2 in and do it.<br />Thanks again!! I will let you no how I make out