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View Full Version : Jetting for Sparks X-6 on 400


ErthXINGon400cc
12-14-2003, 06:11 PM
What jetting is the best for a Curtis Sparks X-6 Ceramic exaust system on the 400EX? Please let me know. Thanks!
12-14-2003, 06:27 PM
im pretty sure i was running around a 42 or 45 piolet and a 156 or 160 main
the-ex-files
12-14-2003, 07:41 PM
Anyone else? I would like to know also.
cals400ex
12-16-2003, 01:20 PM
i am running a 158 in 45 degree temps. my altitude is about 625 feet above sea level. i will need to go down in the summer and maybe up one more size in the colder months. by the way, this is on a 11 compression 406, with cam, uni filter, etc. however, i don't think these mods changed my jetting much at all. removing the lid changed my jetting more than these mods. however, i run the 158 with the lid on. if i took it off, i would have to go up a size or two from the #'s i gave you.