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Discussion Starter · #1 ·
ok first off im new to the quad world, bought a 2002 400ex and im kind of going through everything and fixing what the idiot previous owner didnt do.. i bought a new k &n, aluminum box with cover (wet riding) stock header, with either HMF or FMF havent decided yet, probably HMF.
i want to re jet the carb, i know it will help.. which jets should i go with??? also is there a good video of how to? or just youtube it?
again i know this question is asked over and over so thanks for any input
 

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One or two sizes larger than stock if your not more than 2000 feet over sea level. You need to clean the carb anyway so down load a service manual and it will be pointed out in the process. Someone else here can show you how to download the manual.
 
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