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Discussion Starter · #1 ·
Im probably going to get an HMF slip on for my 2004 400ex soon and would like to know if i have to rejet my quad when i put it on?[
 

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yes, with air lid off use a 170 main jet. and if you haven't already, install a 42 pilot jet. your quad will start alot easier
 

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if you want a red hmf slip on, I have one I took off my 400 just repacked it before I took it off
 

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Yes, most of the power is made in the head pipe
 

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a slip-on goes on a stock head pipe, an aftermarket head pipe will be bigger than stock
 
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