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Honda need some advise bot jetting 450 foreman

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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

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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.

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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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