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I dispute this, My 500 has no issue In fact, I use a harder plug than reccomended, an 8 instead of a 7 ,I have checked the tickover mixture, and my airscrews are turned out more than normal, I also have Boyer ignition, and run the plug gaps at 33thou,
Delta, i disagree,On the asvise of an ngk rep who was a well respected sidcar racer i used D7EV in my 500 that went all over the UK and to the Isle of Man regularly plus commuting 7 miles to work.Never fouled, never failed yes nearly twice the price but well worth it the =L was always sold as a "half grade"
The fact that the L was a half grade came from the same reptat suggested d7ev to me, and that man knew how to read plugs