When we rebuilt the carbs, we had installed drilled main jets and larger pilots because we were removing the airbox and installing a 4 into 1 exhaust.
The engine was obviously running very rich, which was proven by the O2 sensor and A.F.R. meter. We replaced both coils after trying to clean a corroded connection on one of them, and the mixture was still very rich.
After a bunch of test runs with various jets and needle positions, Lou figured out that the needles from the rebuild kit were shaped wrong. He had me swap the stock needles back in, which improved the mixture significantly. Now on the lean side, we shimmed the needles with .56mm which helped, but not enough. Re-jetting to stock mains and pilots with .63mm shim washers did the trick. It's like a different motorcycle now!
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| Fitted with Lou's O2 sensor and A.F.R. meter |
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| Lou's guitar string method for needle shimming |
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| The guitar string keeps the needle loose under the slide clamp |
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