I am needing some tips on what I should get for my kfx400 to make it faster. I already have hmf exhaust but Im not sure if I should keep it. Also, I am getting nerf bars, but I just need to know what I should get to make it faster. PLEASE HELP!!!!

 

Well if the exhaust/jetting/air box mods are not enough you might as well look into a 440 kit and just get it over with........... because those 400cc engines are about maxed for HP after the basic mods...... I mean you could get cams but why bother.... if you really need that much more power get the 440 kit.......