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Why would Cylinder No. 1 run rich?

  • Thread starter Thread starter MisterCinders
  • Start date Start date
M

MisterCinders

Guest
I have worked out most of the mixture issues but continue to have this weirdness on one cylinder.

Again, the bike has pods (don't hate) and a 4-1 pipe. The current jetting is:

Pilot - 17.5
Fuel Screw - 1.25 turns out
Air Screw - 2 turns adjusted with ColorTune
Needle - 4th slot
Mains - 117.5
Float heights are 24mm.
Fresh intake boots and o-rings.
Carbs are fully cleaned, with new o-rings, etc.
Valve clearances are healthy.
Carbs vacuum synched.

As I work through the finer adjustments to the pilot circuit, the plugs have been showing color changes that make sense. They move in the right directions as I adjust things.

For some reason, however, the No. 1 plug frequently shows up much richer than the other three. I suppose I can just alter the pilot screws on that carb to bring it into line, but why would that happen generally apart from strange luck?

FWIW - I don't leave the bike on the side stand for any significant period of time. Unless I am stopping for a short break, it's always on the center stand.
 
Your Colortune can't lie. Have you had a go at running the bike on 2 or 3 cylinders with the throttle stop wound in a bit to keep it from stalling? You can take the carbs nearly to the cutaway using this trick and it will confirm your pilot circuit as more than just at idle.
 
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