GPrider
Well-Known Member
This subject has been debated for several years on one of the FJR forums. The concensus was no performance gains, but longevity was much better than the regular plugs. On my max, which I put about 3 to 4 thousand miles a year on, it is a non factor. My FJR, which I put many more miles on, will benifit much more from them.
GP
GP