Re: Champion or NGK
I prefer Champions in a Force. I have had horrible luck in the past with NGK plugs across the board, in motorcycles, snowmobiles, outboards, and cars.
As far as the Splitfire thing, they do have the advantage of unshrouding the spark. The closer to the center of the combustion chamber that the spark starts, the more efficient the combustion will be. Back in the '70s when I used to race (drags), we had this little trick of bending the electrode so that the center electrode is lined up with the edge of the side electrode. Maybe it's just a state of mind, but the cars always seemed to run better that way. The new Bosch Platinum multi electrode plugs work with the same principle, as do the E3 plugs. I still do it, it can't hurt anything and maybe it helps !!!