Re: 75 Force high speed miss
I am stumped too, stumped. It is usually high speed winding in the stator that causes it to miss at high speed. But seeinz how you replaced that, it leaves fuel delivery or timing advance the areas to go to next. To rule-out fuel delivery as the culprit, next trip out, bring a helper. Have your helper manually pump the primer bulb when the symptom surfaces. If it cures the miss, it is a fuel delivery problem.<br />Check the spark advance linkage for any play. The fact that it runs fine at low RPM indicates the base timing is probably right on,but the linkage may not be tracking it up the range as the throttle is opened up.<br />A timing light and a helper to operate the boat will allow you to adjust the advance linkage once you have removed any possable play in it.<br />All high voltage components can "arc-over" at high RPM, jumping as far as 1/2". Plug wires, plugs themselves, and coil packs will do this.Once they start doing this, they get worse, or more constant, as they build-up a "carbon path" from where they jump across.<br />A run at WOT at night, with the cover off (and your spotter) may reveal visable arcing.<br />But it's a process of elimination for sure.<br />Good luck,and reply with your findings.
