Any one try colder plugs in a big inch hi-comp Twin Cam?Is it necessary and does it cause any error codes with ecm on injected bikes?
Just seems odd that a plug that works in a stock 88" works well in a modified 120.
Mike

 

The SE split fire plug is a cooler plug. I have to say though a spark plug just delivers the spark....it will work the same in a 120 mod or a stock bike. Now if you have lots more compression to deal with a coil change would be in line to give the plug more juice to jump the resistence (gap)