What size of main jet should I run on my kfx 400?? I have put the pro design air filter adapter and a clap on k&n filter with no lid on my air box, everything else is stock. Eleivation is 1575.

 

I put in a 180 and the plug is still white, but it keeps running better everytime I jet up. I sprayed starting fluid all over the carb/manifold to check for air leaks....no leaks. Does'nt a 180 sound big??? Anybody else have this same set up??

 

What needle do you have in there?? If you have the stock, I HIGHLY recommend getting the DynoJet needle or the Alba needle. I say you are lean on the mid range which is why you have such a big main. Try this, move the clip on the needle one spot lower than where it already is...meaning closer to the tapered end. See what that does and lemme know!

 

I have a Scorpion slip-on, uni filter, no airbox lid, mixture screw 3 turns out,(a lil rich there), needle on 3rd clip from top(dyno jet needle), and a 150 main. My mid to top is awesome, but my bottom needs a lilo work. 180 sounds WAY high to me.--1200 feet elevation

 

I moved the needle down 1 position, installed a 162.5 jet and it seems to run fine, plug is tan....probaly did'nt run it long enough with the 180 in. By the way how long do you have to ride to get a good reading?? On my banshee I warm her up, put new plugs in and haul *** for a 1&1/2 miles and shut it down. I did that with my kfx (180 jet) and plug was still white. After I moved the needle I rode it around for 30min and checked the plug and it is tan. Should I put a new plug in a do a WOT test??

 

wow 180 way to high iam at 1200 ft with 165 dyno jet hmf slip on.