got a 02 400ex and bought an fmf powercore 4 slip on and a K&N filter any advise on certain jets to use?needle settings if any?and how much of a difference if i guy were to run with no lid from time 2 time?or does a guy have to rejet each time????
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got a 02 400ex and bought an fmf powercore 4 slip on and a K&N filter any advise on certain jets to use?needle settings if any?and how much of a difference if i guy were to run with no lid from time 2 time?or does a guy have to rejet each time????
It comes with a 148 main and a 38 pilot stock. With a slip-on pipe, a filter, and no other mods, I'd go with a 150 or 152 main and a 40 pilot, depending on your altitude. Taking the lid off makes a little difference, but probably not enough to warrant a change in jetting unless you're already lean with the lid on.
agreed, steve