Parts for HMF Slip on???

[ginobili07]

I ordered a HMF sport series slip on for my 2002 honda 400ex the other day and it should be coming this week sometime. BUt is was wondering what do i need to install it parts wise? I know i should get a new head pipe gasket but is there anything else?? Also wht would the jetting specs be for it i have stock engine with K&N air filter and soon to be HMF Sport Series Slip on.

[STUNTIN400EX]

my hmf sport series slip on came with a 165 and a 170 main. i put the 165 in but will go with something smaller when i get the larger pilots. just put in what ever hmf sends you and tweak the carb from there.

[Exrider434]

I have the same thing on my 04, i have it at a 155 main with the fuel/air screw 2 1/2 turns out and the needle on the 3rd clip...Oh and a K&N..... You shouldn't need a new gasket unless you take the header off, which with a slip on you shouldnt and the gasket that goes on the header between the stock exhaust isnt used with the HMF...

[ginobili07]

Ok thanks.... and i plan on taking the header off and sanding it and re painting it with some high heat paint cuz i cant afford a new header right now.

[mitchamus]

Maker sure you open your airbox either by removing the lid or drill like five 1inch holes in it. what air filter are you useing?

[ginobili07]

i am using a K & N filter, should i get a outerwear for my airbox lid if i drill holes in it?

[99_Fourtrax]

Cool. This thread helped me a little. I bought my '99 used with HMF slip-on, K&N, and jetted. I tore into my carb to see what it had. My main is a 165 and my pilot is the stock 38. After reading this thread, I guess the 165 probably came with the HMF. I also have a strange air box lid. It is clear with 3 holes in it. I have been searching and finally found it online. It is a POWROLL lid. Maybe it was all ordered as a kit at some time, who knows ?? But with those mods, my EX runs great (in INDIANA) if you want to compare.