NGK Iridium spark plugs

[Skidmarx]

i think it may have been running lean, bought the bike stock, was an 04 R1 with full yoshi system, race filter, stacks, and cams had been removed and degreed in a little different, then i fitted the pc3usb, ran ok with a generic base map until i could get it tuned, but was killing plugs, had it dyno'd (to what i think it quite good for a litre) 160.1rwhp, the hotter plugs definatly made it run smoother, even before going on the dyno