Hi all,<br /><br />I have a 1993 15hp Johnson that has an even 90psi in each hole. <br /><br />Does this sound acceptable? <br /><br />Thanks in advance for any info.
Its been my experience that especially on these smaller motors, if they will start with either pull rope or electric starter, then they have enough compression.
90 PSI is a little low for a 1993 15 HP,but generally we use 70 PSI as a cut off.Below that,all the work you do is a gamble as to whether it will run or not.<br /><br />DHP
throw some oil in each cylinder - just enough to wet the rings - and do another compression test. If the pressure goes up then your rings are probably wearing a bit (this would be normal for an older engine or one that has alot of hours.<br />Just a thought...
