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I put the iridiums in yesterday (old plugs looked spot on).  Bike started fine, ran fine, can't say I noticed any difference EXCEPT when I roll off the throttle and slow down using engine breaking it's as though the whole ignition has cut out, it hasn't, it just feels as though the engine isn't firing at all, it still occasionally backfires and burbles to let me know it's still alive, it just sort of feels 'smoother' off throttle.  I can't really put my finger on it.