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I hate problems that only happen sometimes. It's much more convenient when they crap out completely just as you're pulling into the garage. Your problem sounds just like what happened after I "fixed" my pick up coil wires, and didn't secure them quite right... the new wires were just a little too long. Once they got hot (highway), the insulation softened, and they flexed differently, and came in contact with the spinning timing plate. Once it spun through the insulation, one of the wires would ground against it, and I'd lose spark on two plugs.
Have you tried sustaining the problem as long as you can before the bike dies, then checking which headers are hot? That might at least give you a clue as to whether it's spark or fuel. You should do it a few times just to make sure it's the same headers each time.
Good luck!
Have you tried sustaining the problem as long as you can before the bike dies, then checking which headers are hot? That might at least give you a clue as to whether it's spark or fuel. You should do it a few times just to make sure it's the same headers each time.
Good luck!
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