Home › Forum › Ask A Member › 18HP saga continues. Can’t get past 14mph and 3,900 RPM. › Re: 18HP saga continues. Can’t get past 14mph and 3,900 RPM.
Mumbles, The missfire at idle i was chasing was either form a worn mag plate, or a bad plug wire. I bought a mag plate off ebay with the coils, points, wires, condensers etc already installed. I double checked the points gap and put it on my motor and the low RPM missfire went away. I’m not sure what my boat ways. i’m running a 14′ v bottom aluminum lone star boat, with a little bit of wood, bow mount trolling motor and battery. I’m willing to change from 40:1 to 50:1 but I dont’ see that small of a change making a big difference at WOT. I can see it making a difference with fouling plugs at idle etc. Since I know now I only have two main jet size choices, and I was already running the smallest available I think I’m going to try to get the older style carb with the adjustable high speed circuit.