Re: RPM/WOT Evinrude 115 1977
Good going on the service manual....hope it was an OEM manual. So much more in a manual that is specific for your engine.<br /><br />140 on the heads probably mean compression but how long ago was the readings taken????? Get a new set. This will tell you a lot about the engines condition and can be used for future reference. Generally, 90psi and above is considered good compression. More importantly though, the compression on each cylinder should be within 10 to 15% of each other.<br /><br />Just spraying the carbs with carb cleaner don't do much other than make the carbs nice to look at.....no pun intended. Look at the gasket between the bowl and the carb body. If it's black in color, either the carbs have never been rebuilt or a generic kit was used a long time ago. A carb overhaul is not difficult and OEM kits give you everything you need. If the gasket is a reddish brown color, they have been overhauled...but hard to say when.<br /><br />What kind of shape are the fuel lines in? Soft and plyable or hard? Hard lines can lose there grip on connection points and can suck air. Check them out.<br /><br />Water pump....well, if the alarm hasn't come on....if it's still working....then I would assume that the impeller is still pumping water. On the other hand, a cold engine is not good for the engine. Basic test for engine temp....if you can lay your fingers on the flat areas on top of the head, with the engine at idle and warmed up, for several seconds...engine temp should be good.<br /><br />Suppose I've given you enough to think about for now....feel free to post any questions here on the forums that come to mind. Lot of good folks here that can help.
