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Sticky This Maybe !?!?!
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Posted by: Quad18star

I'm wondering if a Moderator would be able to sticky something liek this for us . How about we set up what everyone is running for their jetting in the YFZ450 . I know it's a pain in the butt to have to search all over to find the answers . It's just a suggestion and I'm sure it would help a lot of people out , as well as stop a lot of threads about jetting info .... it could be like a one stop shop for jetting .

Anyways here's my setup ...

Full Curtis Sparks stainless steel exhaust with Sparks Racing filter and adapter (no airbox lid) , along with Sparks racing jet kit .

Approx . 1000 feet above sea level
Temperature between 65 - 80 F with an average of 72F

45 Pilot jet
178 Main jet ( cuz it's cold right now)
NCVQ needle with clip on middle setting
2 1/2 turns out on the fuel screw

These settings seems to be fine for now ... but has a little bit of popping on de-accel . Could be caused by the cold temps ??

Posted by: Fred55

GYTR Aluminum Slip-on
168 M
45 P
4th clip on NVCQ needle
2 turns out on fuel screw
GYTR Foam filter, no air box lid

Posted by: Splatter Matter

DR.D pipe

172 main
45 pilot
4th nvcq needle
2 1/4 turns fuel screw

K&N air filter no lid

Posted by: jlhughes750

NCVQ dirtbike needle clip on the middle

172 main

45 pilot

94 octane sunoco fuel or VP 10?

Sparks full pipe

Sparks foam filter and Sparks ring
also ran K&N with pro design intake ring with same jetting.

I'm in eastern Pa. not positive of the elevation??

Posted by: TheWolf

what about the fuel you are using? I would assume that no mention would be pump gas. You should mention what fuel you use if it is race gas or oxigenated gas.

Also if you know your altitude, mention that.

Thanks

Posted by: Fred55

I changed mine lol, the other one kept fouling plugs?

now im at a
165m
42pilot (stock)
NVCQ 3th clip
Fuel screw 3 turns out

Posted by: sampleez

i finally got my pipe in, and my jetting felt pretty good, but it was about 30 degrees, so i'll have to lean it up a little when it warms up. i have a Dr. D slip-on, the cam mod, and the air box lid off with the stock filter set-up. i run 93 gas, and my elevation is about 750-1500. my jetting is:

172 main
48 pilot
stock needle in 5th position
fuel screw about 2.5 turns out

Posted by: Quad18star

Thanks to everyone who has responded so far ..... but come on you other guys ... post up . Help fellow riders out ... I know there are a LOT more of you guys out there with pipes .... especially when this thread has gotten over 300 views .

Posted by: cdalexct

178 main
45 pilot
ncvq on 5th
2 turns on fuel screw
94 sunoco fuel

Posted by: Quad18star

quote:
Originally posted by cdalexct
178 main
45 pilot
ncvq on 5th
2 turns on fuel screw
94 sunoco fuel

Stock pipe ?? airbox lid on or off? Temps ?? Elevation ??

Posted by: cdalexct

quote:
Originally posted by Quad18star
Stock pipe ?? airbox lid on or off? Temps ?? Elevation ??

HMF full system
airbox lid off with prodesign proflow kit(foam)
airbox lid outwear
35 degrees out runs good
Live in PA dont know Elevation

Posted by: Quad18star

quote:
Originally posted by cdalexct
HMF full system
airbox lid off with prodesign proflow kit(foam)
airbox lid outwear
35 degrees out runs good
Live in PA dont know Elevation

Perfect ... thanks for posting more info .... I think the average Elevation in PA is the same as I have ... anywhere from 700ft to 1300 ft .

Posted by: Bill Fuller

HMF full system with Quiet core insert
UM aluminium air box w/250R Uni foam filter,lid on
North Tenn 500ft elvation
Fuel screw at 2 turns out
165main
45 pilot
NCVQ needle on 3rd clip
94 Ultimate

Posted by: Fred55

Thats exactly what im running except a 42 pilot, what temp are you at?

Posted by: Bill Fuller

Wintertemps range from 20 to 50 degrees.I was running a 162 until I put on the UM airbox/250R Uni.

Posted by: Fred55

Your like the only other person that ive seen with a 165 besides me...everybody says to try 168, and i tried that and i was WAY too rich...weird huh

Posted by: Bill Fuller

I followed HMF instructions and my quad ran like CRAP.I started with the 175 main and the 45 pilot.I went to the NCVQ needle right from the start.It took about 2 months to get it to where I am now,believe me I tried all the combos.I finally ordered jets from 160 to 180(Carb parts wharehouse

)When I had the 170 in it ran like there was water in the gas.When I kept messing around,thought I was there with the 165 main.After going to H/M last year I realized that weasn't right either.I started to think there was a deeper problem(rectifier/electric).But I finally got the 162 in and BINGO there it was.

Posted by: Fred55

yeah it seems that you and i are leaner that everybody else, which is weird too...with full exhausts and filters, i wonder what is causing them to go up so high as 172 and even 180 as hmf suggests

Posted by: SRH

what do you guys recommend for this setup as a good starting point

lid on
dr d slip on w/ fmf powerbomb "sx" header
cam mod
uni air filter
1200 ft above sea level
60-80 degrees
pump gas 93

from what i read about what alot of guys run i was thinking a good starting point would be

168 or 170 main ( what do you guys think)
45 pilot
nvcq needle 4th clip
air screw 2.5 turns out

anyone have a better idea for a good starting point? my quad felt sluggish at times last year and had a slight bottom end hesitation at times with the dyno junk kit and i really wanna solve that

Posted by: Fred55

I have a 165 main
42 pilot(stock)
3rd clip on NVCQ clip
3 turns out on fuel screw

Im at about 1000-1100 ft
and at the moment temps are around 40, i raced a 1 hour harescramble yesterday and it ran great.

Posted by: sampleez

hey srh
main sounds pretty good, pilot will prolly need to be a 48, but 45 might work if it's pretty warm. everything else looks pretty close too

i think upping the pilot is supposed to help the bog

and did you get the header and pipe at the same time, or did you have the stock header on for a while. i was wondering how much that header you have helps. i am really impressed with the dr.d so far tho.

Posted by: ESrider

168 main
45 pilot
airbox lid removed
stock pipe with insert removed
350 feet above sea level
93 octane

Posted by: Quad18star

SRH .... that sounds like a good starting point !!!

Posted by: AshYFZ450

Altitude: Sea Level (Glamis, Gordans, Ogilby)
Temp: Hot (days) Cold (nights) 50f-80f
Cam Mod Yes
Intake: K&N (stock manifold with airbox removed completely)
Exhaust: GYTR slip-on
Main: 172
Pilot: 48
Needle: NCVQ 3rd clip
Fuel Screw: ZipTY 2 1/2 turns

Posted by: tgyolai

i am new to this i am running no lid with pro design air filter system just got sparks header and silencer main is 165 pilot is 42 3rd groove from topon needle this was gytr jet kit i dont know where the fuel screw is so dont know where that is set

Posted by: Quad18star

quote:
Originally posted by tgyolai
i am new to this i am running no lid with pro design air filter system just got sparks header and silencer main is 165 pilot is 42 3rd groove from topon needle this was gytr jet kit i dont know where the fuel screw is so dont know where that is set

I'd run a bit higher main jet ... Sparks recommends a 175 I believe . Also bump that pilot up to atleast a 45 . The fuel screw is underneath the carb and is ressed in ... you'll need a long skinny flat head screw driver to get at it . 2 1/2 turns is what is recommended with Sparks .

Posted by: tgyolai

thanks quad18star

Posted by: SRH

quote:
Originally posted by sampleez
hey srh
main sounds pretty good, pilot will prolly need to be a 48, but 45 might work if it's pretty warm. everything else looks pretty close too

i think upping the pilot is supposed to help the bog

and did you get the header and pipe at the same time, or did you have the stock header on for a while. i was wondering how much that header you have helps. i am really impressed with the dr.d so far tho.

yeah i like the dr d, i havent run with the powerbomb yet , im actually waiting for it to come in, should be next week or so

Posted by: aci clay

168 main 45 pilot, stock needle,fuel screw 3 turns out, lid off, pro design foam filter,3000 ft. elevation so cal hi desert

Posted by: dudleydoright15

I am running a 05, yfz450 with a white brothers E-2 full exhaust with air box lid off and pro flow filter.

175 main
42 pilot
needle out of a yz450 on needle clip position 4
1 1/2 turns out

elevation is between sea level and 500ft.

works great but a little bit of popping when I let off of the gas.

Posted by: 450Rcarbonpro

washington evlevation 800 to 1000 ft.
degrees 50 to 80

Posted by: 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!!

Posted by: 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.

Posted by: drgnerth

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

Posted by: 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.

Posted by: 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 .

Posted by: 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

Posted by: Quad18star

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

Posted by: E.POWERSPORTS

Can you post the stock jetting on a '04?

Posted by: 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

Posted by: xcnick38

full system yoshimura TRC...

158 main
50 piolet
new needle i think 3rd clip

air box lid is on and im also in PA it runs great...

Posted by: onall4rs

i drilled the air screw out today and have a new comeing on friday
so hope to heve the problem solved

Posted by: drue4mpg

06' yfz450

Bill Ballence GYT-R titanuim head and pipe
High flow No Box lid
165 main jet
45 pilot
GYT-R needle Clip 3
2 full turns
seattle 200'
it seems to be dialed in no bog or lag through out the range
made a huge difference on the 3rd groove and taking it back from 2 1/2 to only two turns
its so fast now my girl wont get on it anymore .........PERFECT

Posted by: drue4mpg

GYT-R Titainum full
Pro intake LID OFF
(Bill Balence Kit)
165
45
GYT-R 3rd clip
2 1/2 turns

Seattle WA,
I'm around 400 feet
70 degrees

Posted by: yfzcrazy

I need help i just got the velocity intake and purchased the FMF titanium4 full exhaust and iam not sure what jets to use or even how to figure it out. i was reading your colum and noticed a lot of stuff i dont understand like the fuel screw turns or the size of the jets or temps and elevation. Well i live in san diego so temps are usaully between 50-80 at sea level but i love to go to the desert but i am unsure of the elevation. any help will be great thanks.

Posted by: jcline

165 Main Jet
Pilot, Fuel Screw, and Needle Position Stock
Stock Pipe w/ Baffle Removed
Stock Filter w/ Air Box Lid On
93 Octane Pump Gas

Posted by: BrianEX

I just bought a Big Gun Race Series complete exhaust and will need to rejet. Any recommendations of where to start would help. Only other mods are: no airbox lid and a K&N filter.

Rockford, IL Elevation is around 800 feet.
Temp: 65 degrees

Thanks.

Posted by: husa

Hello,

I�m new here and have registered for one question.
(I have no quad, but a keihin carburretor from YFZ450,year 2004)

I installed it in my husaberg enduro.

I�m surching for a good jetting, and have spend a lot of time in the web.
(It�s quite plain to me, that your jettings must not be the best for my engine (501ccm, longstroke), I will not just copy this )

The stock needle was a NDS-R

The most people here changed to NCV-Q

looking in the keihin.us needle chart
http://www.keihin-us.com/am/_media/..._jetneedles.pdf

the needles are termed OC-XXX

(OB is possible too, I know the difference to OC)

Is a NCVQ in full term OB-NCV???
This is improtand for me to get information about the diameter and so on.
And when this is right, was does the smaller fourth letter "R" mean?
for example Kawasaki has a NCVR needle in the FCR40 (KX450F Motocross...)

thanks in advance!

Posted by: 06 YFZ FATBOY 4

06 YFZ 450: 172 MAIN, 42 PILOT,NCVQ 4TH, K&N NO LID, FATBOY 4 FULL SYSTEM, EXHAUST CAM MOD, 2.5 TURNS ON FUEL SCREW, ELEVATION 2000'-2300', 17-30 CELCIUS=APPROX 65F? IAM HAVING PROBLEMS WITH TOP END WOT, I AM GOING TO TRY 45 PILOT & 175 MAIN TODAY IF IT STOPS SNOWING YAH THATS RIGHT SNOWING

ON APRIL 19. SHEEET I SHOULD BE RIPPING UP THE SAND WITH MY BOYS!!!!!!!. IF ANYONE HAS CLOSE TO THIS SET UP ON THE 06 WITH NO TROUBLE @ 3/4 TO WOT PLEASE POST IT.

Posted by: Xater

what do you guys think the jetting should be with baffle out and lid removed?

Posted by: sdbrown12388

'06 with full gyt-r exhaust, gyt-r air filter
165 main
42 pilot
3rd clip
2 and a half turns

Posted by: bradley300

i noticed no one is mentioning the leak jet??? are you guys having problems with the stumble off idle when you stab the throttle?

louisville, KY
stock filter, no lid
HMF slip on

170 main
NDSR needle #3 down
45 pilot
2 out on the feul screw
30 leak jet
raised the idle just a hair from what would sound normal. it doesnt scream, but its a little more than a slow chug like you would hear on a 400ex

very slight stumble off the bottom when stabbing the throttle from nothing to full, but a 25 leak jet should fix it.

Posted by: 06 YFZ FATBOY 4

BRADLY 300: I DONT HAVE A PROBLEM WITH A STUMBLE WHEN I STAB THE THROTTLE, IT WAS JUST @ 3/4 TO WOT, IT SEEMED TO HAVE MORE TOP END @ 3/4 THROTTLE THEN IT DID @ WOT. I PUT A 175 MAIN AND PLAYED WITH FUEL SCREW, THIS CLEANED UP MY PROBLEM @ WOT. QUESTION- IF I PUT A 45 PILOT IN WOULD I NEED TO PUT A 178 MAIN JET FOR MORE FUEL TO MATCH UP WITH THE MORE AIR? I THINK SO BUT NOT TO SURE. MORE FUEL & MORE AIR = MORE POWER?

Posted by: bradley300

i doubt it, but you'll only know once you ride it

Posted by: 06 YFZ FATBOY 4

Thanks for the replie, the more you work on them the more you learn. have a great & safe summer!!!!

Posted by: 06 YFZ FATBOY 4

BRADLEY 300. I got it figured out 175 main, 42 pilot, 2 turns on fuel screw, ncvq 4th, k&n no lid, cam mod, fatboy 4 full system, 15 tooth sprocket, elevation 2000'- 2500' approx. works great no hesitation off bottom end, no bobble at 3/4 to wot

thanks for everyones help on this sticky!!!!this thing hauls ***** now!!!

Posted by: yfzrider310

for the stock exaust with the baffle removed do i have to change the jetting or should i just leave it stock

Posted by: jcline

I changed the main jet to a 160 and took the air box lid off. Runs great!

Posted by: 06 YFZ FATBOY 4

quote:
Originally posted by yfzrider310
for the stock exaust with the baffle removed do i have to change the jetting or should i just leave it stock

The answer is yes you should change your jetting, take your air box lid off and see how it runs.

Posted by: yfzrider310

does taking the airbox lid off make that big of a difference??

Posted by: ohsobad_chevy

Northern Oklahoma: Approx. 700 ft.

2007 YFZ 450 SE
Curtis Sparks X6 pipe
UNI air filter w/o airbox lid
Air temp around 74 degrees

165 main
45 pilot
4th clip on NCVQ needle
All the way in and 2.5 out on the screw

Posted by: jcline

Taking the air box lid off was a must after I changed the main jet. It did'nt run right otherwise. The combination of the changes gave me noticeably more on the low end.

Posted by: walshyfz86

Ported head
web +5 cams
WR crank
CP 13:1 piston
Stock airfilter. half a airbox. back is cut off.And screen removed
C12 fuel
Sparks bigcore exhaust

In nj not sure elevation.

180 main
48 pilot
Stock needle 5th clip down
2 1/2 turns out

Professionally dynoed where these were the best settings.

Posted by: 06 YFZ FATBOY 4

I just bought a 07 se, elevation 2000- 3000, temp +10 deg, main 175, pilot 42, no lid, cam mod!!, drilled out exhaust, ncvq 4th clip from bottom, 2 1/4 turn on fuel screw. I still have the 06. blown motor. any body with a 04- 05 -06 do the oil mod NOW!!! or your looking at lots of $$$$ for parts. crank seized not enough oil to the crank.

Posted by: sylvan_srt4

2004 yfz
elevation : 2800 feet
mods : alba full pipe, velocity air filter w/o air lid
main 170
pilot 45
stock needle 5th clip
fuel screw 2.5 turns out