I have a 04 ltz400 with fmf power bomb header and fmf slip on. The jetting is stil Stock. Runs good. But a buddy of mine was saying it would run way to lean on Stock jetting with this exhaust. Thoughts?
If you made no other changes.I would increase the main jet at least one size. These things are already on the lean side, unless you are above 4000 ft or so.
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