First i would like to know what you think of your current jet kit!
What is the best jet kit i can get for my '04 KFX400 or is better to buy the needle individual and where wound i buy that at.
It is piped with a Ti-4 and kn airfilter. I think it i running lean and not sure what type of jet is in there. I just bought from a guy.
It is hesitiant on the very low end like 1/8 throttle. What can be done and where can i get the parts. Ryan

 

jet kits like k&n and moose are made by dynojet so they all the same. most jet kits ae made by dyno jet except for the fmf i think so they are pritty much all the same. you will be better off getting the whole jet kit thou, you will not benifit as much from just a main jet

 

FMF is dynojet also. I just put one on my 650. I like the dynojet needles because they are adjustable. Or you can shim the stockers. Just remember the dynojets have different jet sizes than stock keihin jets. the numbers are lower. there are charts that convert the numbers. Like a 138 dynojet is about the size of a 152 keihin.