F1 Rotary issues.

Hi.
Some clues please.
I have been experiencing my F1 running well then failing on the left plug. It initially began killing the bike completely for a few minutes, then later just missing on one plug for a period then clearing itself for a further 20 klms then missing again etc.
I replaced the plugs and completely serviced the carbs. Heres wher it gets interesting.
I restarted the bike, ran beautifully with crisp throttle response for 5 minutes then dropped the plug again. What i found was the 3 yellow wires ( i think alternator ) were really hot and some scorch marks at the white connectors.
Could all this be a failing 6v coil or something related thats dropping the spark? Why would my alternator wires be getting really hot? Is there a relationship there somewhere?
Any ideas on where I start. Thanks lads.
Mark in Wagga Wagga Australia.

There may be a relationship between your hot alternator wires and failing spark.

The hot wires suggest an abnormal current draw somewhere in the electrical system.

The key to finding the source of a high current draw, is to divide and conquer. Try to remove segments of the electrical load by unplugging connectors, and isolating branches of the electrical circuit.

The fault is not necessarily in some ignition component. I can imagine something not ignition related, drawing down the battery voltage which then causes ignition failure.

The problem may be temperature related, and rears its ugly head after a part gets hot.

Divide and conquer!

Slick

EDIT: a good first place to look is your regulator/rectifier. Charge up your battery with an external battery charger. Then disconnect the reg/rectifier leads, and run the bike on battery alone and check for problems. Completely isolate the reg/rectifier when making this test.