Re: 1971 johnson 70 hp misfiring at high rpms
Removed stator cleaned points and regaped to .010 cleaned stator and rotor still the same problem losing spark at higher rpms ok till about 1500 rpm's after that the higher the rpm's the more the less spark you get out of the coil causing misfire. Is there a way to test the control mod or coil? I also seen here on iboats where someone posted that they used a set of points and condencer from a koler single cylinder engine and converted the electronic enginition but I can't find it again does anyone have this knowledge or seen it on iboats and could tell me where to find it.
Did you ever resolve this, I have simular fault and still no idea as to the cause.
Replaced - stator, coils, leads, plugs, Stripped and cleaned carbs, replaced fuel line filters and pump.
Still same result soon as I try to push for to much throttle is breaks down and missfires.
this can be noticed when you just open the throttle from idle in gear, it will missfire straight away or if you bring up so far. it will then get upto about 15knots of cruise on calm waters. increasing throttle just causes missfire.
Any advise ? "short of a stick of dynamite"
