Sparking Coil
Posted: Sat Jan 25, 2020 4:49 pm
Having rewired to a 12v negative earth system, which of course entailed fitting a 12v alternator and new coil, all seemed well when I went for a ride. About 6 miles into the ride I slowed for a left hand corner and on opening up the throttle, the engine started to misfire, it wasn't too bad and I got home again (another 6 miles). On investigating I found that the coil was sparking from the HT terminal to the distributor LT terminal. The misfire only seems to be on the right hand cylinder.
The plugs are nearly new and I checked the gaps to make sure the spark wasn't having to jump a too large gap (set at 25 thou).
Before I delve any further by removing the seat, tank and testing the coil resistances, has anyone any idea why the spark should appear where it does.
The fault started suddenly and may simply be a coil that has failed early on in its life, its covered just 124 miles, not that its failed completed as its producing a good spark, albeit from the wrong place!........a mystery to me.
John
The plugs are nearly new and I checked the gaps to make sure the spark wasn't having to jump a too large gap (set at 25 thou).
Before I delve any further by removing the seat, tank and testing the coil resistances, has anyone any idea why the spark should appear where it does.
The fault started suddenly and may simply be a coil that has failed early on in its life, its covered just 124 miles, not that its failed completed as its producing a good spark, albeit from the wrong place!........a mystery to me.
John