Well well...........80 psi is very low.<br />Ask your mechanic, under what condition he have taken the compression test.<br />If the motor was cold, and the control-handle was in pos. neutrail, the he would get a very low result. <br />The motor should be warm, and thottle arm at full speed when taking the compression test, other wice the result will be 20-30 psi lower.Originally posted by mean15:<br /> My mechanic checked the compression on my 1989 88hp rude when he cleaned the carbs for me and said that they checked 80 psi. He said this was fine for this engine. Is this OK?<br /><br />Also, what should my RPMS be at take-off?
Originally posted by rodbolt:<br /> on a two stroke it usually does not matter on the throttle position nor hot nor cold. however if one is done the rest need to be done the same way. that cross flow usually comes in a bit higher.. we need to see the spread from highest to lowest,. the spread tells the story.
Originally posted by SoLittle:<br /> I would not be concerned on the compression if the performance is OK. You might do a deacrb to free up an rings that are sticking.<br /><br />On the rpms my 1987 110s call for around 750 for idle and 5500 at WOT.
Just as a matter of curiousity, did you test cold and compare to warm? it would be interesting to know if your difference with mechanic is the warm vs. cold or just because your gauge is different.Originally posted by mean15:<br /> I purchased a compression gauge and checked the compression myself. They checked 113, 110, 112,110 respectively. Thanks to everyone for your input. He must have checked it cold.
My engine only turns 5000 with the 13.5 x 18 and runs 42GPS. Have you checked your speed with your speedometer or GPS?Originally posted by Big Bubba:<br /> Hello Mean15,<br /><br />I also own a 1989 88 horsepower Evinrude SPL V-4 outboard. My motor has a 12 3/4 X 21 prop on it and goes 47 MPH at WOT on a 1989 15 1/2 footer ski boat. Is that sound right to you? I was just curious. I don't have a tachometer guage on my boat so I don't know how many RPM's it is turning at WOT.
