Quote:
I was always of the belief that twin plugs were used to ensure that they fire the lean mixtures that are used in modern engines in an attempt to meet emmission standards.

I guess that if the combustion chamber was the right shape, it would need only one plug. After all, others manage it.

Been following this for awhile. Nobody seems to have thought about how the spark travels, Id expect that alot of the spark is now happening in the dizzy cap thats why it sounds crap at idle, the spark will take the easy route so if there is wires for it to travel on instead of jumping it will tke the wires.

Hey your right, I never once thought about how a spark travels
Dastunb120 has never once said it sounds crap.
Sparks dont follow wires. Sparks travel the easiest way to ground. Bare leads with engine grime on them are a good conductor. Its easier for a spark to run down a lead and ground on the head - than it would be to jump a spark plug on the compression stroke.