I personally run NGK's in my bikes. Below is good info all about plugs
The front cyclinder runs a little cooler,therefore it may run a bit richer.Also that read,is it after idling,did you run under load at a speific rpm and kill the engine etc.does it run well,good gas mileage?YOu shouldn't need to run different heat ranges unless something is wrong.classicglide said:I just pulled my plugs out for something to do and found the front cyl plug to be
very black. The rear cyl seems to be in great shape a little brown but the
insulator is white and looks normal.I'm running stock plugs they have 3000mi.
Stage one efi with se race slipons and dealer installed download. Any tips on
why the front cyl is so different from the rear. Can you run a hotter plug in the front than the rear ? any help for this problem... thanks