YFZ450 Jetting .

[450Rcarbonpro]

washington evlevation 800 to 1000 ft.
degrees 50 to 80

[Bill Fuller]

I tried everything up to a 180 main.I tried the NCVQ needle on clip positions from 2 to 5 clips.I never tried anything above a 45 pilot.My bike would run like shiat from 1/2 throttle up until I started moving to what I was being told was lean.Once I started coming down she ran better and better until I finally came up with my settings=45 pilot,3rd clip on NCVQ needle and a 162 main.I have a HMF full system with Quiet Core insert,airbox with lid on.(No engine mods)Runs GREAT!!

[Quad18star]

What would cause a flame to shoot out of the exhaust ???

I'm running a 175 main , 45 pilot, 2 1/2 turns on the fuel screw .... full sparks system with foam filter and adapter , no air box lid .

The temps are hot right now ... like 80+ degrees and Im at about 1000 feet.

[drgnerth]

When does it do it? Wot, idle, all the time. You look to be rich on the main.

[drgnerth]

By the way.
170 main 45 pilot middle clip on NCVQ 1 3/4 on air/fuel mixture 800 ft above sea level.

Ron Woods intake, no air box, K&N w/ outerwear, Hot Cams, WR crank, rod, piston, full HMF sport.

[Quad18star]

My dad just took my quad out yesturday , and he said it was really missing in the higher RPMs . I didn't really get to see him or hear him on it , so I can't tell if it was the motor bouncing off the rev limited ( I have stock gearing with 18" rear tires) or if it was my jetting .

What would you guys recommend for jetting of an 04 with full system Sparks pipe and filter setup ?? The temps are in and around the freezing mark right now and the last time I checked my plug it was really rich , but that was with hot temps .

[JDiablo]

WHat will you guys reccomend for this setup?
Rossier full exhaust
CFM open airbox with UNI filter
Cam mod
elevation 700-1000
Temp 25-45ish
Can anyone give me a good place to start at thanks

[Quad18star]

When all else fails for jetting , just forget to install the main jet and let that sucker run rich .

[E.POWERSPORTS]

Can you post the stock jetting on a '04?

[onall4rs]

i have a full yoshi system, air box lid off,180 main 42 pilot,air screw rounded off and its not turning. engine a pig to start
hot or cold
help