If you do, get that done at TripleZee Cycles in Manukau, not on the magic-numbers Dynojet that AMPS bought to bolster the fragile egos of their tractor-riding customers.
But there's not much point changing the fuelling and ignition timing if you're not changing anything else. The factory probably got it right. Not that I'd know about XB12Xs. Big Dave probably knows these things.
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