#42's will be way too rich for it if you are running stock oil pump and airbox/filter, even if modified.
We've run #40's before, but it's more often than not still too rich. I know owners that have even gone down to #35 on the slow jets to get it clean at the bottom-end.
Honda seem to have it bang-on with #38S's... funny that!
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Andy.
NSR-WORLD.COM
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