1 k100 intermittent spark on one cylinder. Wed Aug 18, 2021 4:01 pm
Beamer
Platinum member
I have an ignition problem which has got me a bit stumped.
I have a K100 which has been stood outside quite a while. It's mostly working but misfiring a bit on one cylinder.
I checked it with a strobe light and 3 cylinders look fine but the fourth if firing rather intermittently. I swapped the HT leads and the problem stayed with the same HT output. So that seems to eliminate the HT lead and plug.
I suspected a winding fault on one side of the coil. I swapped the coil for a spare but the problem persisted.
I then inverted the two low tension connections to the coil and the fault followed the green/yellow connection.
I'm having trouble making sense of that finding since, AFAIKT, there is just a single primary triggered by a single connection to the electronic ignition unit.
Now this does not make sense to me but maybe someone can tell me what I'm misunderstanding here.
Does this make sense to anyone?
TIA.