So what jets do I need now? (440 bore + other stuff)

[NeonImpact]

I ordered the Wiseco 440 big bore kit, the FMF powerbomb header and all this is going on later this week coming.

Which jets will I need?

I currently have the HMF slip-on and the UNI air filter.

Maryland / Chesapeake Bay Area

[NeonImpact]

Help? :confused:

[cals400ex]

you probably won't need to change the mainjet as long as your right on the mainjet now.

[NeonImpact]

I havent put in any of the jets yet, but I can tell you I have the following:

42 pilot
155,160,165 main

Suggestion?

[Bush0102]

HMF reccomends a 170 for their slip-on...i run a 168 with my lid on and a stock pilot with the needle in the stock position. You should be ok anywhere between 165 and 175, depending on whether or not you run your airbox lid.

[cals400ex]

you will hear different specs from different people. i have heard HMF say a few things. i know they always said to go with a larger mainjet but recently i have been hearing them say a 152 or 155 for a piped 400ex. what other mods are on the bike? what elevation you at?

[85atc350x]

I run a 175mj and a 48pj on 110 octane vp fuel with the airbox lid removed.

[deathman53]

you gonna get a cam? a big bore kit is kinda worthless without a cam. the cam will wake the bike up alot more, and your money will be justified. You can get cams that don't require hardwelded rockers, or even get a xr400 cam, is quite a bit better than a stock 400ex.

[NeonImpact]

Originally posted by deathman53
you gonna get a cam? a big bore kit is kinda worthless without a cam. the cam will wake the bike up alot more, and your money will be justified. You can get cams that don't require hardwelded rockers, or even get a xr400 cam, is quite a bit better than a stock 400ex.

Already have the Hotcams Stage2