Ok so I am a little new to outboards, as in this is my first to look at. I am mechanically incline though. Rebuild motors and transmission on the side. So here is the issue. I have a Evinrude 150xp (model E150STLESB) that I got on a trade. This was thought to be running but I could not get to start. I checked the compression cold with all spark plugs removed and got 63-65 PSI on ALL cylinders with throttle open. At first I thought this was really low as most forum talk about a low cylinder being around 80 PSI. What gets me and does not sound right is that all cylinders are the same. To me I would think that there is something else besides rings that would be a problem as I wouldn't think that rings on all 6 cylinders would wear that low at the same time. Theoretically that should happen but not in reality. I have heard that baffles or reeds might have something to do with it, but not sure. Also just for giggles I hooked air up to one cylinder and plugged the other two on the bank with the spark plugs. Turned the air to 60 then 100 PSI and sprayed soapy water around the gasket areas of the cylinder cover, cylinder and power head with no leaks. I heard air coming out the exhaust so I turned the crank. At 60 psi I could turn it but at 100 I could only turn it enough to stop hearing it come our the exhaust. Looking for any ideas to check before I tear the motor down. Thank you in advance for all the help.
