jetting question

[ridehonda400ex]

okay so more thsn likely im going to be getting an HMF sport series slip on for my stock 400ex. i was wondering what size jets i should go up to? ive got an UNI filter as of right now, although im thinking of getting a K&N. My airbox lid is on too. Give me any suggestions you got!!!

[honda400ex2003]

http://www.exriders.com/vbb/showthread.php?s=&threadid=445695&highlight=jetting+placement

check out the first table for a slip on and filter with the lid on. that will get you started. then you can use the rest to get it dialed in. you should be good with a 152 main and 3.5 turns out on the f/a screw and leave the needle alone. steve

[ridehonda400ex]

okay i was thinking a 152 would be good. but what about pilot jet? isnt the stock jet a 38? i was thinking a 40? maybe 42. and how much performance will i get with the lid on? i know with the lid off ill get more, but due to riding conditions i want it on. and would a 152 main jet with k&n filter and lid on work good? or is there something else i need?

[honda400ex2003]

most likely it will be fine with the stock pilot. I wouldnt do anything unless really have popping bad on decel. just turn it out to 3.5 and go from there. with the filter you should be set as long as you leave the lid on. steve

[ridehonda400ex]

thanks steve. i think im gunna do the K&N filter, everyone says they let in dirt. but i'm going to keep my clean and oiled

[honda400ex2003]

ive never had any issues with mine but i use an outerwear also. I like it, easy to clean along with the cars too. :D steve

[ridehonda400ex]

another question is what size filter do i get? i went to rockymountains website and.....well blows me away lol