I had a bad fouling problem on the number 4 cylinder using the stock bp6es plugs. I found some Splitfire plugs for the bike and it has greatly reduced (although not completely eliminated) the fouling. I hear that the Splitfires run a little hotter than the equivalent plugs from other manufacturers. Since I live in the Pacific "North - wet" it is a little cooler than other areas and I have had no problems even in the summer on long trips running these plugs. I have about 5000 miles on them and they are still going strong (clean them once in a while).
Good luck.
Good luck.
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