Posted on Monday Jun 13, 2011 at 1:10 AM
I have a '90 2 stroke 25hp Evinrude (long shaft) that i just took out yesterday and it wont get up and go like it should. The throttle cable moves everything as it should and has plenty of room to go, but it wont go any more than about 10 mph (on a 16 ft jon), which is at about 60% throttle. I get no response by throttling it past that point.
It seems to me like a fuel metering/flowing problem (its not a cavitation or trim problem IMHO, b/c it has a hydrofoil stabilizer and i tried all different trims). Brand new fuel line and bulb as well. The motor doesnt sound or feel like its bogging down at a certain point, it just wont make high RPM's. I also adjusted the fuel mixture screw on the carb and that made no difference at any given setting. I am running it rich (40:1), but there is no smoking so i dont think that's too rich, but i'm a greenhorn on this motor stuff.
Should i attack the carburetor or the fuel pump first? Any thoughts and/or suggestions at all would be great. Thanks!!