03 kfx400 jetting issues with pro circuit T4 and twin air filter
#1
03 kfx400 jetting issues with pro circuit T4 and twin air filter
I have an 03 kfx400 and will be installing a pro circuit T4 full system and twin air filter. I will be running with the airbox lid on and no holes in it. Can I just swap main jets or will i have to tune the pilot jet and all that other b.s. as well?? I will be riding at 1100 ft. elevation, what jets should I run???
#2
#4
03 kfx400 jetting issues with pro circuit T4 and twin air filter
i believe stock is 142. I have heard guys going as high as 175 on the kfx400 which seems a bit high to me. I was thinking in the area of 160-165 at most. I am mainly concerned with whether or not I can just change the main and leave everything else as is.
#5
03 kfx400 jetting issues with pro circuit T4 and twin air filter
I also have a Pro Circuit T4 full system.My stock jet was a 134.
I have no airbox lid or snorkel and a K&N filter.I went to a 160 main.
I didn't touch the pilot or needle and it made a huge difference.My elevation is
460 feet above sea level.Since your runnig your airbox lid you shouldn't have
to go too high on the main jet. I would start around 145 or so and do a bunch
of plug checks.A pain in the ars but well worth it when you get it dialed in.Good luck.[img]i/expressions/face-icon-small-smile.gif[/img]
I have no airbox lid or snorkel and a K&N filter.I went to a 160 main.
I didn't touch the pilot or needle and it made a huge difference.My elevation is
460 feet above sea level.Since your runnig your airbox lid you shouldn't have
to go too high on the main jet. I would start around 145 or so and do a bunch
of plug checks.A pain in the ars but well worth it when you get it dialed in.Good luck.[img]i/expressions/face-icon-small-smile.gif[/img]
#6
03 kfx400 jetting issues with pro circuit T4 and twin air filter
My stock main jet was a 135.
Man that pro circuit T4 full system is going to be craveing more air.I would at least drill 3 to 5 one inch holes in the air box lid.If that scares you they make plugs to fit in the holes that are made of the same stuff as the air filter.
Man that pro circuit T4 full system is going to be craveing more air.I would at least drill 3 to 5 one inch holes in the air box lid.If that scares you they make plugs to fit in the holes that are made of the same stuff as the air filter.
#7
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#8
03 kfx400 jetting issues with pro circuit T4 and twin air filter
I just installed the pro circuit T4 and head pipe and twin air filter. I started it up and ran it for a bit and it ran fine. Didn't run choppy and didn't sputter. I didn't change the main jet and it seems to be fine. The mechanic at the dealer says that 145 will be as high as I need to go if any. Can anyone help me with this?? What size jet do I need to go to???
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