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400ex jetting


Ocala400ex

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i have an 06 400ex, just put on an hmf slip on exhaust, uni air filter with the airbox lid on, new spark plug, 42 pilot jet, and i started with a 160 main and when i checked the plug it looked a little dark so i switched to a 155 main. both jets ran perfectly fine. should i adjust the a/f screw and see what happens?

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