Coil Polarity

[roy the mechanic]

My experience is wasted spark,both cylinders firing simultaneous, is good for spectators when the motor is flooded, gives 2 foot flames! proper twin spark, both plugs in ONE cylinder fire together gives a much sweeter motor, screw the horsepower, if it runs good, it must be good!

 

[Bill Thomas]

I liked the idea of twin coil because there is less to go wrong, ie No dist' cap and No rotor arm, I have never touched a Harly' And I had never heard of this befor Len told me, Down side , I think it uses more amps, Cheers Bill.