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WR400/426/450 Jetting Database




133 replies to this topic
  • jaked02

    TT Newbie

18 posts
Location: Idaho

Posted May 28, 2008 - 05:40 AM


Year: 2006
Model (400 - 426 - 450): WR450
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: stock
Leak Jet: stock with O-ring mod on linkage
Starter Jet: 65 (Stock)
Fuel screw (turns out): ZIP TY Fuel Screw 1.5 Turns Out (still tuning)
Needle Model/Clip position: JD Red / 5th Position
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): Off
AIS Removed (Y/N): Y
Airfilter Brand: stock
Exhaust Brand: stock
Average Altitude: 3000_6000ft
Average Temperature: 80 - 90 F
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: a couple of stickers

  • thebushboy

    TT Newbie

2 posts
Location: United Kingdom

Posted June 29, 2008 - 11:51 PM


Year: 2008
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): Scotts, 1,5 turns out
Needle Model/Clip position: JD Blue 4th Position
Grey Wire Mod (Y/N): y
TPS Connected (Y/N): y
Airbox Snorkel/Lid (on or off): On
AIS Removed (Y/N): n
Airfilter Brand: stock
Exhaust Brand: stock exhaust entire baffel removed
Average Altitude: 0-500ft
Average Temperature: 50-80,
Degree of Satisfaction (0-10):9
Additional Mods/Comments: O-ring'd the AP arm linkage with the thick O ring from the JD Jetting kit. Imported the kit from the US (live in the UK) Was sceptical how much this kit would help but now that I have installed it I am absolutely blown away. It's like riding a different bike. Can't keep the front wheel down, starts so easily, is smoother and tons more power. The JD jetting kit is an awesome product!!

  • Goose610

    TT Newbie

6 posts
Location: Sweden

Posted July 20, 2008 - 06:06 AM


Year: 2008
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 170
Main Air Jet: 110
Pilot Jet: 48
Pilot Air Jet: 70
Leak Jet: 45
Starter Jet: 65
Fuel screw (turns out): Zip Ty 1-3/4
Needle Model/Clip position: GDDUQ / 4
Grey Wire Mod (Y/N): N/A in Sweden
TPS Connected (Y/N): Y
Air box Snorkel/Lid (on or off): Off / Off
AIS Removed (Y/N): N
Air filter Brand: Stock
Exhaust Brand: Stock
Average Altitude: 0-500ft / 0-150m
Average Temperature: 68-77f / 20-25c (In summer)
Average Humidity: 50-80%
Degree of Satisfaction (0-10): 9 (still to improve the exhaust)
Additional Mods/Comments: Pee shouter removed. O-ring at the AP arm linkage (O-ring mod removed the off-idle bog completely).

  • Fredders

    TT Member

37 posts
Location: Other

Posted July 31, 2008 - 06:09 AM


Year: 1999
Model (400 - 426 - 450): WR400F EU-version
Cam Timing (WR/YZ): WR
Main jet: 172
Pilot Jet: 45
PAJ: Stock
Leak Jet: There is no such thing
Starter Jet: 60
Fuel screw (turns out): 2½
Needle Model/Clip position: 6th
Accelerator pump diaphragm: "Yamaha -19" (0.75sec duration)
Grey Wire Mod (Y/N): No need to. EU version
TPS Connected (Y/N): Yes
Airbox Snorkel/Lid (on or off): Lid off
Airfilter Brand: TwinAir
Exhaust Brand: White Brothers E-series
Average Altitude: 0- 1600 feet
Average Temperature: 60-85
Degree of Satisfaction (0-10): 10

  • Charles De Mar

    TT Gold Member

1,445 posts
Location: Utah

Posted August 26, 2008 - 06:24 AM


Year: 2006
Model (400 - 426 - 450): WR450
Cam Timing (WR/YZ): WR
Main jet: 158
Pilot Jet: stock
Leak Jet: #60
Starter Jet: 65 (Stock)
Fuel screw (turns out): ZIP TY Fuel Screw 1.5 Turns Out
Needle Model/Clip position: YZ std needle '05 3rd from top
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): Off
AIS Removed (Y/N): Y
Airfilter Brand: No toil
Exhaust Brand: FMF Q4
Average Altitude: 5000_9000ft
Average Temperature: 70 - 85 F
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: I have been running red #4 in cooler temps but it was still to rich. I just put in the #60 leak jet and have eliminated the initial throttle hesitation. I will probably changing the main jet depending on temp. I have done the o-ring mod too. If I don't find this set up working I will be pulling out the JD needles and go with stock YZ needle from here on out. I also have a quickshot 2 on the carb. I'm no longer using JD needles.

  • Fullbore4

    TT Bronze Member

355 posts
Location: Wyoming

Posted August 27, 2008 - 06:11 PM


Year: 2006
Model (400 - 426 - 450): WR450
Cam Timing (WR/YZ): YZ
Main jet: 165
Pilot Jet: 40 (ACV is disabled)
Leak Jet: #71 (#50 drilled out)
Starter Jet: 72
Pilot Air Jet: 100
Fuel screw (turns out): ZIP TY Fuel Screw 1.5 Turns Out
Needle Model/Clip position: NFPR - 4
Grey Wire Mod (Y/N): Y
Blue/White Wire Mod (Y/N): Y - starts fairly fast even with YZ exhaust cam
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): Off
AIS Removed (Y/N): Y
Airfilter Brand: Twin Air
Exhaust Brand: FMF Powercore 4, Stock headpipe
Average Altitude: 3000 - 9000ft
Average Temperature: 60 - 90 F
Degree of Satisfaction (0-10): 9.5

Additional Mods/Comments: Red Beard AP mod (diaphram stud ground off, linkage wired - I got tired of replacing O-rings and this works better). Powernow and Scary Fast Powershot AP pump cover. No hesitation or bog. I am on the rich side throughout but the Powernow, which does help bottom end, pulls more more gas.

  • Mtn-Track

    TT Bronze Member

115 posts
Location: Colorado

Posted September 05, 2008 - 07:32 AM


Year: 2008
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 152 (yes, a 152!)
Pilot Jet: STOCK
PAJ: STOCK
Leak Jet: STOCK
Starter Jet: STOCK
Fuel screw (turns out): 2
Needle Model/Clip position: GYTR-AIS REM. KIT "MYSTERY NEEDLE", 2ND FROM THE TOP.
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): OFF
AIS Removed (Y/N): Y
Airfilter Brand: STOCK
Exhaust Brand: FMF POWERCORE 4
Average Altitude: 5000-14,000ft
Average Temperature: 50-80F
Average Humidity: Pretty darn DRY!
Degree of Satisfaction (0-10): 9.5
Additional Mods/Comments: This bike runs STRONG! NO STUTTER or any overheating from 5000-11,000ft, and starts instantly. Above 11,000ft some of the stutter starts to come back, but it's minimal, and it still starts right up. No bog or hesitation anywhere in my altitude range!:thumbsup:

  • shaunone

    TT Newbie

12 posts
Location: British Columbia

Posted October 01, 2008 - 03:55 PM


Year: 2006
Model (400 - 426 - 450): WR450
Cam Timing (WR/YZ): WR
Main jet: 165
Pilot Jet: 48
Leak Jet: 40
Starter Jet: 70
Pilot Air Jet: 100
Fuel screw (turns out): PRO CIRCUIT 2.25 TURNS OUT
Needle Model/Clip position: GYTR AIS/5TH
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): Off
AIS Removed (Y/N): Y
Airfilter Brand: UNI FILTER
Exhaust Brand: AKRAPOVIC, Stock headpipe
Average Altitude: 2700 - 4000ft
Average Temperature: 60 - 90 F
Degree of Satisfaction (0-10): 9

Additional Mods/Comments: AP mod. Quickshot 2. No hesitation or bog.

  • flyer05

    TT Member

79 posts
Location: Michigan

Posted October 07, 2008 - 10:11 AM


Year:2000
Model (400 - 426 - 450):400
Cam Timing (WR/YZ):YZ
Main jet:168
Pilot Jet:48
PAJ:stock
Leak Jet:n/a
Starter Jet:stock
Fuel screw (turns out):1 1/2
Needle Model/Clip position:JD red 4th
Grey Wire Mod (Y/N):Canadian model so no and yes
TPS Connected (Y/N):Y
Airbox Snorkel/Lid (on or off):Off
AIS Removed (Y/N):n/a
Airfilter Brand: not sure
Exhaust Brand:White brother R series
Average Altitude:600-2000
Average Temperature:55-95
Average Humidity:60-80%
Degree of Satisfaction (0-10):8
Additional Mods/Comments:Still fine tuning but it runs very good as is starts easy and no bog. O-ring and BK mod done.

  • jhmotard

    TT Bronze Member

202 posts
Location: Michigan

Posted December 19, 2008 - 07:08 AM


Year: 2006
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: 48
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 1.5-2
Needle Model/Clip position: NVCQ (yfz450 needle) 4th clip
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): off w/holes in lid
AIS Removed (Y/N): Y
Airfilter Brand: K&N
Exhaust Brand: FMF Factory 4.1 Carbon
Average Altitude: 800ft.
Average Temperature: 50-90
Average Humidity: 60-100%
Degree of Satisfaction (0-10): 8.9
Additional Mods/Comments: o-ring mod done. e-starts are quick hot or cold. 1 kick hot or cold. michigan temperatures range throughout the day so i make adjustments to the fuel screw daily

  • Bleeds_Blue

    TT Bronze Member

136 posts
Location: California

Posted March 03, 2009 - 10:18 PM


Model: 2006 WR450F
Cam Timing: WR (stock)
Main Jet: 168 (165 is stock)
Pilot Jet: 48 (45 is stock)
Fuel screw: GYTR - 2 out (about)
Needle model/Clip position: 4th pos on needle from GYTR AIS kit
Starter Jet: 65 (stock)
Leak Jet: 40 (50 is stock)
Airbox lid (on or off): snorkel removed, holes in side of box
AIS: GYTR AIS removal kit
Grey Wire Mod (Y/N): YES
Pipe: FMF Q w/ S.A.
Air filter: UNI Multi-Stage
Altitude where you ride: Sea level to 4000
Temperature where you ride: Varies, mostly 70s-80s(Jawbone)

Degree of Jetting satisfaction: Need to test, will report. :p


Model: 2006 WR450F
Cam Timing: WR (stock)
Main Jet: 170 (165 is stock)
Pilot Jet: 48 (45 is stock)
Fuel screw: GYTR - 1.75 out (about)
Needle model/Clip position: 4th pos on needle from GYTR AIS kit
Starter Jet: 65 (stock)
Leak Jet: 40 (50 is stock)
Airbox lid (on or off): snorkel removed, holes in side of box
AIS: GYTR AIS removal kit
Grey Wire Mod (Y/N): YES
Pipe: White Bros E2
Air filter: UNI Multi-Stage
Additional Mods: PowerNow
Altitude where you ride: Sea level to 4000
Temperature where you ride: Varies, mostly 70s-80s(Jawbone)

Degree of Jetting satisfaction: Rips.

  • aruggiero

    TT Member

99 posts
Location: California

Posted April 15, 2009 - 12:00 PM


Year: 2008
Model 2008 WR
Cam Timing (WR/YZ):WR
Main jet:168
Pilot Jet:48
PAJ:110
Leak Jet:45
Starter Jet:65
Fuel screw (turns out):1.75
Needle Model/Clip position:GYTR 4th
Grey Wire Mod (Y/N):Y
TPS Connected (Y/N):
Airbox Snorkel/Lid (on or off):OFF
AIS Removed (Y/N):Y
Airfilter Brand:STOCK
Exhaust Brand:STOCK PMB INSERT
Average Altitude:0-7000FT
Average Temperature:50-90
Average Humidity:
Degree of Satisfaction (0-10):9
Additional Mods/Comments:AIS KIT a little rich still fine tuning runs fine 2nd time on it .

  • CharWR450

    TT Member

48 posts
Location: Cyprus

Posted July 24, 2009 - 07:24 AM


Year: 2008
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 170
Main Air Jet: 110 (GYTR-AIS)
Pilot Jet: 48
Pilot Air Jet: 80
Leak Jet: 50
Starter Jet: 65
Fuel screw (turns out): Zip Ty 1-1/2 (still tuning)
Needle Model/Clip position: JD red / 4th clip
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Air box Snorkel/Lid : Removed
O-ring mode: Done
AIS Removed (Y/N): Y
Air filter Brand: Twin Air
Exhaust Brand: FMF Factory 4.1 complete (open)
Average Altitude: 0-500ft
Average Temperature: 60-90f
Average Humidity: 50-80%
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: I've got before the 175main - 50 Pilot. The bike before accelarates immediately and make some backfire. Now with the 170/48 runs more smoothly.

  • desertlover

    TT Bronze Member

117 posts
Location: Utah

Posted August 04, 2009 - 02:40 PM


Year: 2007
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 165
Pilot Jet: 45
PAJ:
Leak Jet:
Starter Jet:
Fuel screw (turns out): 1 1/2
Needle Model/Clip position: 4
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): OFF
AIS Removed (Y/N): Y
Airfilter Brand:NO-TOIL
Exhaust Brand: STOCK
Average Altitude: 4-9000
Average Temperature: 80?
Average Humidity: DRY

  • panaman

    TT Titanium Member

2,850 posts
Location: Ohio

Posted August 28, 2009 - 02:28 PM


Year: 2009
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 165
Pilot Jet: 48
PAJ: Stock
Leak Jet: 45
Starter Jet: Stock (don't know what size it is)
Fuel screw (turns out): 1.5
Needle Model/Clip position: JD Red needle 5th clip
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): off
AIS Removed (Y/N): Y
Airfilter Brand: Stock
Exhaust Brand: Stock (removed the little pee pee from the exhaust)
Average Altitude: 800-1600
Average Temperature: 75-85F
Average Humidity: no idea
Degree of Satisfaction (0-10): 10 and its scary powerfull
Additional Mods/Comments: Swing arm graphics.. i think they added like 3 horsepower

  • wilb67

    TT Member

34 posts
Location: Tennessee
Garage View Garage

Posted October 30, 2009 - 10:33 PM


Year: 2007
Model : 450
Cam Timing (WR/YZ): WR
Main jet: 168
Main Air Jet: 70
Pilot Jet: 42
Leak Jet: 45
Starter Jet: 65
Fuel screw (turns out): 2 1/8
Needle Model/Clip position: JD red / 3rd clip pos.
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Air box Snorkel/Lid : Removed
O-ring mode: JD THICK
AIS Removed (Y/N): Y
Air filter Brand: TWIN AIR
Exhaust Brand: STOCK OPENED UP
Average Altitude: 300-1000ft
Average Temperature: 55-70f CURRENT
Average Humidity: 40-80%
Degree of Satisfaction (0-10): 9

Edited by wilb67, November 03, 2009 - 08:34 PM.


  • DAVE BT

    TT Member

49 posts
Location: Australia

Posted November 03, 2009 - 07:55 PM


Year: 2008 AUSTRALIAN
Model : 450
Cam Timing (WR/YZ): WR
Main jet: 168
Main Air Jet:STD
Pilot Jet: 45
Leak Jet: STD
Starter Jet: STD
Fuel screw (turns out): 1 3/4
Needle Model/Clip position: GDDSQ / 4 clip
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Air box Snorkel/Lid : Removed
O-ring mode: NONE
AIS Removed (Y/N): NONE
Air filter Brand: Twin Air
Exhaust Brand: GYTR STD HEADER
Average Altitude: 0-1000ft
Average Temperature: 20-40 DEG Celcius
Average Humidity: 20-70%
Degree of Satisfaction (0-10): 9

still fine tuning would like a yz header to shift mid range a little higher:thumbsup:

Edited by DAVE BT, November 05, 2009 - 07:38 PM.


  • unclemd

    TT Member

57 posts
Location: Newfoundland

Posted December 01, 2009 - 05:24 PM


Year: 2007
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): Hot Cams Stage 1
Main jet: 170
Pilot Jet: 48
PAJ: 110
Starter Jet: STD
Fuel screw (turns out): 2 turns out
Needle Model/Clip position: JD Red 5th clip
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): OFF
AIS Removed (Y/N): Y
Airfilter Brand: GYTR
Exhaust Brand: Lexx MXE silencer with pro circuit head pipe
Average Altitude: 500-2000
Average Temperature: 50-95
Average Humidity: 80%
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: Bike pulls hard through the whole power curve. Still a little studder at steady throtle but I think its the normal studder for the bike.

  • claymanwr

    TT Newbie

3 posts
Location: California

Posted December 12, 2009 - 05:33 PM


Year:2002
Model: 426
Cam Timing: 2003 YZ 450 CAM
Main jet:170
Pilot Jet:45
PAJ:STOCK
Leak Jet:STOCK
Starter Jet:STOCK
Fuel screw (turns out):2
Needle Model/Clip position:3 (Needle from YFZ 450 quad)
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): OFF
AIS Removed (Y/N):N
Airfilter Brand:?
Exhaust Brand: Leo Vince full system
Average Altitude:Sealevel ( California)
Average Temperature: (60-90)
Average Humidity: 60-70
Degree of Satisfaction (0-10): 8
Additional Mods/Comments:

I just added the needle and adjusted the acc pump, it ran great before with some off idle studder, hopefully that is gone now.

  • Nutty Professor

    TT Member

30 posts
Location: Australia

Posted June 23, 2010 - 01:57 AM


Year: [COLOR="Blue"]2010[/COLOR]
Model (400 - 426 - [COLOR="Blue"]450[/COLOR]):
Cam Timing ([COLOR="Blue"]WR[/COLOR]/YZ):
Main jet: [COLOR="Blue"]168[/COLOR]
MAJ: [COLOR="Blue"]178 (#54 drill)[/COLOR]
Pilot Jet:[COLOR="Blue"]42[/COLOR]
PAJ:[COLOR="Blue"]84 (#66 drill)[/COLOR]
Leak Jet: [COLOR="Blue"]R&D adjustable[/COLOR]
Starter Jet:[COLOR="Blue"]65[/COLOR]
Fuel screw (turns out):[COLOR="Blue"]2 1/4[/COLOR]
Needle Model/Clip position: [COLOR="Blue"]**DVR-#4[/COLOR]
Grey Wire Mod ([COLOR="Blue"]Y[/COLOR]/N):
TPS Connected ([COLOR="Blue"]Y[/COLOR]/N):
Airbox Snorkel/Lid (on or [COLOR="Blue"]off[/COLOR]):
AIS Removed ([COLOR="Blue"]Y[/COLOR]/N):
Airfilter Brand: [COLOR="Blue"]Moto Air[/COLOR]
Exhaust Brand: [COLOR="Blue"]2008 YZ450F mechanically baffled[/COLOR]
Average Altitude:[COLOR="Blue"]0-3000'[/COLOR]
Average Temperature: [COLOR="Blue"]65-75F[/COLOR]
Average Humidity:[COLOR="Blue"]75%[/COLOR]
Degree of Satisfaction (0-10):[COLOR="Blue"]9[/COLOR]
Additional Mods/Comments:

TPS voltage: [COLOR="Blue"]0.70v[/COLOR]
Float Height: [COLOR="Blue"]9mm[/COLOR]
Squirt length: [COLOR="Blue"]15"[/COLOR]
[COLOR="Blue"]O'ring mod
2nd gen BK style mod
R&D AP link spring
enlarged AP feeder orifice[/COLOR]

[COLOR="Purple"]Will do 60 miles before hitting reserve in GNCC style conditions[/COLOR]

[COLOR="DarkRed"]p.s. IMHO, this thread is pretty much useless unless PAJ, MAJ and float height are made compulsory inputs, the rest of the jetting hangs off these criteria. If the tuner doesn't know these values, their input is questionable anyway.[/COLOR]

Edited by Nutty Professor, June 23, 2010 - 10:46 PM.





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