need jet help

[drag93ex]

ive searched but came up with nothing to exactly what i need. i need to know what main and pilot jet to use for my 400.

02 stock engine
hmf slip on
fmf powerbomb headpipe
air box lid on
k&n filter

i might run without air box too. any help is appreciated. im new to jetting.

[hornetgod13]

155K Main Jet with the Air Box Lid On.

160K Main Jet with the Airbox Lid Off.

42K Pilot (slow) Jet would'nt hurt either.

Those estimates should get you with in a jet size either way. Temperature and your riding altitude have a great deal to do with it as well. I recommend ordering 152K to 162K so you have the option to go up or down a size or two depending on if you choose to run with the lid On or Off. You can order individual sized jets from www.jetsrus.com They have reasonable prices and fast shipping.

[drag93ex]

should i go with keihin jets? the summer temp is usually 70-90*. im not sure about the altitude, i live in northern ky.

[hornetgod13]

Yes, go with Keihin jets. They are inexpensive and can be purchase individually.

[Wheelie]

40 pilot and 152 main.

[hornetgod13]

Actually Wheelie may be right. It's a toss up on a 152K and 155K. I'd rather be a tad rich than run my quad lean.

[drag93ex]

im going to get some jets from local dealer today. ill get the 40 and 42 pilot and also 152-162 main

[Honda#4]

Order a 42 pilot, and main jets from 152 to 165, just in case in the future you plan on doing more mods your gonna need bigger mains.

152 main and a 40 pilot with lid
155 main and a 40 pilot without lid

If it gets cold by you just toss in a 42 pilot and that will help with cold starting.