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Air filter

1221 Views 5 Replies 3 Participants Last post by  Redracer
What is a good jet size to go up to on a 300 fourtrax 1990 mod and a 400ex 2000 model both K&N air filters. I had bigger jets in my 400 but when I rebuilt the carb I forgot to get bigger jets and the ones I had are missing.
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Well my friend's 400ex I believe has a 170 jet as far as the 300 I would say somewhere around 128 to 130.
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