Missfiring R34 *ALWAYS* = coilpacks
My second R34, the first thing to get done on it was a set of splitfires....I never wanted to go through the frustration of those bloody things playing up ever again. Not doing them just wastes dyno time.
I always say to anyone buying an R34, always factor immediately a coilpack swap, the packs were just manufactured shit and don't last, no amount of electrical tape, silicone, gypsy tears will fix something that is inherent in the triggering circuit of these things.
Don't skimp on JJR bullshit, just get splitfires