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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,086
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Did you gap the plugs correctly? The gap needs to be bigger than standard plugs! You may not be getting a good enough spark.
Gap for iridium plugs should be 0.9mm, compared to 0.6mm for standard.
HTH!