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View Full Version : Jetting on a FCR 39mm


3x440ex
08-19-2003, 11:32 AM
What jet size should i run on an FCR 39mm with these mods..

WB filter with airbox lid ON..
WB mid range cam..
E-series pro meg full exhaust..

Thanks
H440exconfused
08-19-2003, 11:53 AM
I am very interested my FCR 39 mm is on the way, and I am waiting to hear this, but I run No lid. with my mods.
skemp
08-20-2003, 07:49 AM
I run a 165 main, 52 pilot, and OCEM-P needle in the middle position on a built motor. I would say try a 160 and work your way down until you find what it runs best with. I really don't have any experience with these carbs on basically stock motors, but there is a starting point.
stupid driver
08-20-2003, 02:14 PM
w/ all my mods listed below, i am running

168 main ( switching up from a 165)
52 pilot
air screw 2.5 turns out
needle clip 3 or 4 from top, i havnt dialed this all the way in yet
sparks400
08-20-2003, 04:44 PM
i run a 170 dyno jet, thats what dynojet says to run with my mods
stupid driver
08-20-2003, 05:33 PM
Originally posted by sparks400
i run a 170 dyno jet, thats what dynojet says to run with my mods

Is that for your 400ex or for the z400?
JD400exrider
08-20-2003, 05:38 PM
With the mods listed below.

168 main
52 pilot
Fuel screw out 2 1/2 turns

Don't know where the needle is. I bumped the main up from a 165. It seems to run good, however i am going to have it dynoed with a sniffer put in the pipe to get the jetting right on. From what i have heard the 165 / 52 combo seems to work in most applications.
H440exconfused
08-20-2003, 05:39 PM
Originally posted by sparks400
i run a 170 dyno jet, thats what dynojet says to run with my mods


WOW, 50 HP with cams, carb, pipe and K&N. Sweet, didnt think you could get 50 with out a big bore or strokin it.
stupid driver
08-20-2003, 06:05 PM
Originally posted by H440exconfused
WOW, 50 HP with cams, carb, pipe and K&N. Sweet, didnt think you could get 50 with out a big bore or strokin it.

Stickers....Lots of stickers :rolleyes:
H440exconfused
08-20-2003, 06:20 PM
Originally posted by stupid driver
Stickers....Lots of stickers :rolleyes:



I dont know about that I should get mine on a dydno then cause last week at the cabin my little nephew counted all mine and told me I have 126 stickers on my quad, I must have atleast 80 HP then. thanks for the info I guess i dont oven need a dyno after all, lol





Dont mean to flame anyone, its late and just thought it sounded good. LOL:D :eek: :eek: :eek: