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WR400/426/450 Jetting Database




133 replies to this topic
  • 3boyz3dogz

    TT Member

30 posts
Location: California

Posted December 07, 2005 - 10:39 AM


Model (400 - 426 - 450): 2004 450
Timing (WR-YZ): WR
Main jet: 160
Pilot Jet: 42
Fuel screw (turns out): 1 3/4
Needle model/Clip position: Blue, 4th position
Airbox lid (on or off): off
Pipe: Stock w/ PMB insert
Altitude where you ride: Sea Level to 4500
Temperature where you ride: 50-90
Degree of satisfaction :applause: :p :ride:

Also: leak jet - plugged, starter jet - 72, pilot air jet - 100, diaphram inserted in reverse position. UNI filter, Zyp-Ty fuel screw

I can't take the credit, but this set up is great for overall riding. The bike starts much easier and I'm not draining the battery on cold starts....

  • wrinmontana

    TT Newbie

10 posts
Location: Montana

Posted January 21, 2006 - 02:26 PM


Model: 01' WR 426
Timing: Stock wr
Main Jet: 170 JD
Pilot Jet: Stock
Fuel Screw: ZipTy .. 1.5 out
Needle model/Clip Position: JD Blue #4 down
Airbox Lid: OFF
Pipe: Stock
Air Filter: Stock
Altitude: 0-3000 ft
Temp: 40-65 degrees with considerable humidity
Degree of satisfaction: :thumbsup:

  • freestyle250

    TT Bronze Member

338 posts
Location: Utah
Garage View Garage

Posted January 22, 2006 - 10:02 AM


Model (400 - 426 - 450): '05 450
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: Stock
Fuel screw (turns out): Zip-Ty 1 3/4 turns
Needle model/Clip position: JD Blue 3rd ring
Airbox lid (on or off): On
Pipe: Minus Baffle
Altitude where you ride: 5000-9000
Temperature where you ride: 70's-high 90's
Degree of satisfaction: Wont know till winters over :thumbsup:

  • Johnny34

    TT Bronze Member

153 posts
Location: Oregon

Posted January 23, 2006 - 01:52 PM


Model (400 - 426 - 450): 2005 450
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): ZipTy - 2 turns
Needle model/Clip position: Stock
Airbox lid (on or off): Snorkel out, punch-outs removed
Pipe: Stock, baffle removed
Altitude where you ride: 100 to 4,000
Temperature where you ride: 35F - 65F
Degree of satisfaction: :thumbsup: :bonk: :thumbsup:

This setup has worked great all year and doesn't require me to change a thing.

  • dbailey223

    TT Silver Member

532 posts
Location: Nevada

Posted January 23, 2006 - 03:39 PM


Model (400 - 426 - 450):2003 WR 450
Timing (WR-YZ): WR
Main jet:168
Pilot Jet:45 (Starter jet 72, leak jet 70)
Fuel screw (turns out):2
Needle model/Clip position:JD Red 5
Airbox lid (on or off):Snorkel removed
Pipe:Stock, removed outer baffle
Altitude where you ride:2500-7000
Temperature where you ride:Vegas, so 40-90 F
Degree of satisfaction:98%

  • snakesausage

    TT Bronze Member

122 posts
Location: Texas

Posted February 01, 2006 - 10:14 PM


Model (400 - 426 - 450): 2005 450
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): ZipTy - 2 turns
Needle model/Clip position: Stock
Airbox lid (on or off): Snorkel out, punch-outs removed
Pipe: Stock, baffle removed
Altitude where you ride: 100 to 1500 FT
Temperature where you ride: 55F - 75F

No problems yet, but the hot Texas weather is coming up in a few months so these settings may change.

  • roan

    TT Newbie

16 posts
Location: South Africa

Posted February 16, 2006 - 03:00 AM


Model (400 - 426 - 450):450
Timing (WR-YZ):wr
Main jet:168
Pilot Jet:48
Fuel screw (turns out):2
Needle model/Clip position:#4
Airbox lid (on or off):mod
Pipe:FMF
Altitude where you ride:4200 ABS
Temperature where you ride:32-40 *C
Degree of satisfaction:very happy :thumbsup: :thumbsup: :bonk: :bonk: :bonk: :eek:

  • MKP

    TT Bronze Member

175 posts
Location: Chile

Posted February 21, 2006 - 02:15 PM


Model (400 - 426 - 450): 450
Timing (WR-YZ):YZ
Main jet:175
Pilot Jet:48(winter) 45(summer)
Fuel screw (turns out):2.0
Needle model/Clip position:stock
Airbox lid (on or off):off
Pipe:baffle out
Altitude where you ride:0-2000 feet
Temperature where you ride:60-80
Degree of satisfaction:9

  • Kepy

    TT Bronze Member

146 posts
Location: Poland

Posted March 03, 2006 - 01:09 PM


Model: WR450 F ‘06
Timing: WR
Main Jet: 170
Pilot Jet: 48
Starter Jet: 70
Pilot Air Jet: stock
Leak Jet:50
Fuel screw: Factory R&D - P 51A, 1 3/4 turns out
AP cover: Factory R&D - P 38 Lightning
Needle: OBDUS 4th clip
Pipe: Stock, baffle removed
Elevation: 1000
Temp: 45-75 F
Gray wire disconnected, air box snorkel removed, YZ throttle stop, ACV disabled, AIS – home made removal kit.
Tall man mods: footpegs - Fastway F3, seat SDG Racing tall, handlebar risers – Ramirez

Degree of satisfaction: 10/10 :thumbsup:

  • pHreaC

    TT Member

72 posts
Location: Belgium

Posted March 07, 2006 - 10:07 AM


This is what i ended up with:

Model (400 - 426 - 450): WR450F ‘06
Timing (WR-YZ): WR (grey-wire cut)
Main jet: 170
Pilot Jet: 48
Starter Jet: stock (not listed in the manual)
Pilot air Jet: stock (not listed in the manual)
Leak Jet: stock (50)
Fuel screw (turns out): stock (1,75 out)
Needle model/Clip position: OBDUS 4th clip
Airbox lid (on or off): off
Pipe: stock, baffle removed
Altitude where you ride: 0-2000ft
Temperature where you ride: 30-85 F (0-30 °C)

  • mmello

    TT Member

29 posts
Location: Brazil

Posted March 14, 2006 - 05:36 PM


Model (400 - 426 - 450): WR450F ‘05
Timing (WR-YZ): WR (grey-wire cut)
Main jet: 160
Pilot Jet: 48
Starter Jet: stock
Pilot air Jet: stock
Leak Jet: stock
Fuel screw (turns out): zip-ty (2,00 out)
Needle model/Clip position: Red #4
Airbox lid (on or off): off
Pipe: SuperTrapp IDS2 Race - 16 disks
Altitude where you ride: 500-2000ft
Temperature where you ride: 80-105 F (30-46 °C)
Boyelsen Acc Pump
14/45
Satisfaction 0-10 : 8

It too hard to start above 90 F , too rich in the rapid acceleration.

Tocantins, Brasil __________________________________

  • Poway1464

    TT Bronze Member

134 posts
Location: California

Posted April 02, 2006 - 10:10 PM


Model (400 - 426 - 450):2003 WR450
Timing (WR-YZ): WR - Gray wire cut
Main jet:170
Pilot Jet:45
Fuel screw (turns out):Zip-Ty1.75
Needle model/Clip position:JD Blue/4th
Airbox lid (on or off): off
Pipe: ProCircuit 496
Altitude where you ride: sea level to 2500ft
Temperature where you ride: 65 - 90
Degree of satisfaction:6+

Great mid-range on up, but stutter at low speed-constant RPM. Tried tons of combos and same result. TPS plugged or uplugged = no difference.

  • JCORMI

    TT Bronze Member

191 posts
Location: Maine

Posted April 05, 2006 - 08:43 AM


Model (400 - 426 - 450):2006 wr 450
Timing (WR-YZ): WR
Main jet:170
Pilot Jet:48
Fuel screw (turns out):1.75
Needle model/Clip position:JD red on the third clip
Airbox lid (on or off): off with cutouts removed
Pipe: Stock with no baffle
Altitude where you ride: sea level 1000'
Temperature where you ride:40-60 right now Degree of satisfaction:8

I gave it an eight because I wanted to leave room for improvement. the bike does rip though. It took me a long time to get it right, my setting on the needle is so much different than what the JD kit or the data base suggested. I had to try about 7 different settings before I could get rid of my mid range sputtering. Finally switching to the red needle and backing it down one clip at a time until I got to the third clip, now I can pull easy second gear wheelies and third gear with a little yank on the bars. Settings will change once I get the money for the Pipe I have been eyeing !

  • wavetechinc

    TT Newbie

14 posts
Location: California

Posted April 14, 2006 - 10:16 PM


Model:'03 WR450
Timing: WR
Main Jet:168
Pilot Jet: 48
Starter Jet: 70
Leak Jet: 40
Fuel screw (turns out): 1.75
Needle model/Clip position: JD Blue 3
Airbox lid: On w/ snorkel removed, stock filter.
Pipe: FMF Q, Stock header pipe
Atitude where you ride:800-4500
Temperature where you ride:50-75

Degree of satisfaction: Lower Elevations to @2500 - Fantastic, then gets fatter to 4500, but still great power throughout. I weight 175 filly outfitted, so not a big load. Easily lifts in top of first 3 gears.

Additional Info: NGK CR8EK's made starting easy with no/little higher alt. fouling, ACV operational, AP cover mod (self, sim. to Boyesen), no bog, sputter, flat spot, slight popping higher alt., no backfire.

  • rlp1

    TT Bronze Member

169 posts
Location: California

Posted April 20, 2006 - 05:42 PM


Model (400 - 426 - 450): 2006 WR450F
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): Stock? Not sure, didn't touch it
Needle model/Clip position: Stock
Airbox lid (on or off): Stock
Pipe: all stock, baffle removed from silencer.
Altitude where you ride: 2000-4000 ft.
Temperature where you ride: 45-85 degrees
Degree of satisfaction: :thumbsup: It's my buddy's bike. It seems to have a lot more power now that we did the baffle mod and rejetted. Had a little problem with hesitation at the start, but then once it warmed up it seemed fine.

By the way, the stock jets are 165 main 45 pilot, that doesn't seem to be listed anywhere.

  • boer

    TT Bronze Member

346 posts
Location: South Africa

Posted April 21, 2006 - 08:30 PM


Model: 2006 WR450
Timing (WR-YZ): WR cams with Grey wire cut
Main jet: #168
Pilot Jet: #48
Leak Jet: standard
Fuel screw (turns out): Zip TY, 1 out
Needle model/Clip position: JD Red #5 position
Air box: side still on but snorkel out.
Filter: Twinair + PC Racing filter skin
Pipe: White Brothers E2
AIS off
YZ Throttle screw
Altitude where you ride: sea level to 350 feet
Temperature where you ride: Now 22 to 32 degC

  • matthewdcross

    TT Member

25 posts
Location: Washington

Posted April 27, 2006 - 08:50 PM


Model : 2006 WR450FV
Timing (WR-YZ) : WR
Throttle Stop (WR-YZ) : YZ (comes with GYTR AIS removal kit)
Grey Wire Cut (YES-NO) : Yes
Main jet: 168
Pilot Jet: 48 (comes with GYTR AIS removal kit)
Starter Jet: Stock
Leak: 40
Fuel screw (turns out): 1.75
Needle model/Clip position:
GYTR / 4th clip from top (comes with GYTR AIS removal kit)
Airbox lid (on or off): snorkel removed, side cutouts removed
Pipe: Pro Circuit T-4 slip-on
air filter: GYTR Dual Stage Foam Filter
Altitude where you ride: 1500 - 4000 ASL
Temperature where you ride: 50 - 95F
Air Induction System (AIS) :
Removed using GYTR AIS Removal kit.
Yamaha Part number (GYT-5TJ93-69-00)

Degree of satisfaction: 10!! Runs superb!! No hesitation, very crisp throttle response and starts very easy! :crazy:

  • RSWR450F

    TT Bronze Member

285 posts
Location: Czech Republic
Garage View Garage

Posted May 05, 2006 - 02:14 PM


Model : 2006 WR450F
Timing (WR-YZ) : WR
Grey Wire Cut (YES-NO) : Yes
Main jet: 165
Pilot Jet: 48
Air Jet: 65
Leak: Stock
Fuel screw (turns out): 1 1/2
Needle model/Clip position: OBDUQ - 4.
Airbox lid (on or off): snorkel removed
Pipe: Full titanium Leo Vince X3
air filter: TWIN Air
Temperature where you ride: 10 - 30 ´C

  • silverlakerider

    TT Gold Member

1,072 posts
Location: Nevada

Posted May 12, 2006 - 12:34 PM


Finally got it right today. 165 Main, JD Red#4, 45 pilot, 1.5 turns out, other jets stock. It's mid 80's during day and mid 40's at night, no humidity and 4,000 foot elevation.

  • Stiletto_72

    TT Member

96 posts
Location: Pennsylvania

Posted May 30, 2006 - 07:56 PM


Model (400 - 426 - 450): 06 wr450f
Timing (WR-YZ): yz
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): 1.25
Needle model/Clip position: JD red needle 5th clip
Airbox lid (on or off): on (side opened up and baffles removed
Pipe: fmf 4.1 sl
Altitude where you ride: 1500 +/- 400 feet
Temperature where you ride: this jet setting tested from 65 to 90 degrees
Degree of satisfaction: very satisfied. No bog, hestitation popping or farting. Pulls strong throughout the rpm range.
Additional mods :JD powersurge accelerator pump kit with 40% oring with 40 leakjet

Mods for both bikes: Grey wire disconnect, airbox mod, yz throttle stop & AIS kit. I adjusted the slide height to the recommended 3.1mm and removed all the play from the accelerator pump linkage. All other jets are stock unless otherwise mentioned.

Matts Bike with Moose racing (aka dynojet) kit, boyesen pump cover with JD 80% oring & 60 leakjet.
Model (400 - 426 - 450): 05 wr450f
Timing (WR-YZ): yz
Main jet: 150
Pilot Jet:48
Fuel screw (turns out): 1.0
Needle model/Clip position: 4th clip
Airbox lid (on or off): on but baffles removed, side cover cut
Pipe: whiteborthers mx4
Altitude where you ride: same as above
Temperature where you ride: same as above
Degree of satisfaction: very satisfied. Told me he had an occassionally sputter while cruising at a steady speed, but it only happened a handle full of times during the 3 hours he rode. Bottom end is strong and hits hard, and pulls clean throughout the rpm range.

As Burned stated in one of my previous post the moose racing needle is much richer down low. I had to install a 60 leakjet in matts bike to eliminate the off idle hesistation. You can still stall the bike, but there is no reason to wick the throttle that hard while riding. I found with the JD kit I installed the 40 leak jet to eliminate my off idle throttle issue.

I would like to say Indy's guide is nearly spot on. I thought I may have to richen my main a bit after installing the fmf pipe, but I didn't. Both matt and I are really happy with both products.

If anyone is wondering about the sound of the fmf factory 4.1 SL Natural Titanium it sounds pretty good. Its defienately louder, but has a nice deeper sounding tone to it. The WhiteBrothers mx4 matt got is just plain rude to the ear drums.




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