need some advise bot jetting 450 foreman

Honda

i ve got a 2004 foreman s its got a k&n filter and whitebrothers muffler on it. its running lean and losing power i tried to step up to a 132 main jet but still running lean it came factory with a 130 main jet can anyone give me some ideas thanks

You will need a larger Pilot Jet, and a larger Main Jet. Main Jet needs to be around 135 to 138 perhaps.

You might be fine on the pilot, that you can adjust with the mixture screw so don't change it yet. Set the mixture screw at 2-1/2 turns out. The main looks very lean. You should be around 140.

what if i put the stock muffler back on will it still run lean with just the k&n air filter

what if i put the stock muffler back on will it still run lean with just the k&n air filter

It might.

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