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WR400/426/450 Jetting Database




133 replies to this topic
  • gloft

    TT Bronze Member

163 posts
Location: Georgia

Posted May 05, 2005 - 06:20 PM


Model (400 - 426 - 450): 03' WR 450F
Timing (WR-YZ): YZ
Main jet: #168
Pilot Jet: # 48
Fuel screw (turns out): 1 1/2
Leak Jet: # 40
Needle model/Clip position: JD Red / pos 3
Airbox lid (on or off): off snorkel removed
Pipe: Stock with Baja baffle insert
Altitude where you ride: 0-3000ft
Temperature where you ride: 65-90deg
Degree of satisfaction: 9/10

  • Psychoone

    TT Member

31 posts
Location: Washington

Posted May 10, 2005 - 10:50 AM


Model (400 - 426 - 450): 2003 WR450
Timing (WR-YZ): YZ, with YZ Cam
Main jet: 170
Pilot Jet: Stock, 48
Leak: 40
Starter: 70
Fuel screw (turns out): 2 out
Needle model/Clip position: JD blue on the 4th groove
Airbox lid (on or off): snorkel removed
Pipe: Jardine
Air filter: K&N
Altitude where you ride: 0 - 1000 ASL
Boyeson Quickshot :)

Thanks,

Kevin

  • momudder

    TT Newbie

10 posts
Location: Missouri

Posted June 01, 2005 - 02:40 PM


Model (400 - 426 - 450): 03' WR450
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: 48
Leak: 40
Fuel screw (turns out): 3
Needle model: stock/3rd
Airbox lid (on or off):On/ Snorkel removed
Pipe: Stock with Vortek tip
Altitude where you ride: 0-5000
Temperature where you ride: 60-90F
AIS: In tact
All free mods done
Degree of satisfaction: 8/10
I just bought this bike and the free mods had been done. When the throttle was wacked open such as you do to clear a log the motor would DIE! I used this data base to come up with my jetting and the leak jet was reccomended by the parts counter guy. Big difference throughout the power range and no more bog when the throttle is wacked. I rated it an 8 since i am unfamiliar with what to expect and left room to improve. thanks for the help all! :)

  • JeffWR

    TT Member

73 posts
Location: New York

Posted June 02, 2005 - 04:30 PM


Model (400 - 426 - 450): 05' WR450
All free mods done
Timing: WR
Main Jet: 170 was 165
Pilot: 48 was 45
PAJ: stock ??
Starter Jet: 65 stock
Leak: 40 was 50
ACV: Boyesen Quickshot
TPS: Connected
Fuel screw: Zyp-Ty 1.75 turns out
Needle: JD Red #5
Air box: Snorkle removed
Pipe: stock w/o baffle sometimes use the PMB insert
Altitude: 500-1500
Temp: 60's - 70's
Humidity: 50 - 60%
Satisfaction: 9.8 out of 10 The bike rips with no bog anywhere. I prefer the baffle being out to the PMB insert.

  • Blaster21996

    TT Silver Member

834 posts
Location: Other

Posted June 17, 2005 - 08:26 PM


05 WR450
JD Red Clip4
#40 Leak Jet
#48 Pilot Jet
165 Main Jet
Boysen Quick Shot AP Cover
Grey Wire
Throtle Stop Cut
Fliudyne High Capacity Radiators
Snorkle Cut
Red Line Synth Oil
Engine Ice Coolant

Has a stud-d-er at 1/4 throttle cruising. Will try a #160 MJ


Florida (Central) 0-100ft
Temps are around 90, high humidity

  • radish150

    TT Bronze Member

160 posts
Location: Peru

Posted July 04, 2005 - 10:21 PM


99 WR-400, sea-level, high 80´s to low 90´s, super high humidity, JD red needle at number 3 clip, 160 main, MSR needle 2.5 turns out, other jetting stock, drilled out PMB muffler insert. This is the ONLY combination I could get to work here on this bike. Everything is feeling pretty good now, need to decide if the bike runs better with TPS dc´d or not.

Mark Sheldon

  • bcavmechanic

    TT Bronze Member

111 posts
Location: British Columbia

Posted July 13, 2005 - 08:51 PM


Model: '02 WR426 Canadian model
Timing:Hotcams IN/EX
Main jet: 170
Pilot Jet: 45
Needle: JD Blue 3rd Clip
AP: BK mod and 1 sec shot with Boyesen Quickshot Cover
Fuel screw (turns out): 2
Airbox lid: off
Power now on Carb Inlet
Pipe: FMF Q and Power Bomb header
Altitude where you ride: 100ft to 2500 ft ASL
Temperature where you ride: 10 deg C to 30 deg C
Degree of satisfaction: Runs great everywhere,This Motor Rips!

  • dman450f

    TT Bronze Member

167 posts
Location: Oregon

Posted July 28, 2005 - 07:03 PM


05 wr450f
mods done
blue needle #3
#168 main jet
AIS removal kit"highly recommended"
elevation is 3500 to 6500



started right up! seems to run great,no backfire

very happy with this bike!!

  • rtrolli69

    TT Member

60 posts
Location: New Mexico

Posted July 29, 2005 - 07:13 PM


Heres my jetting info.Thanks for the starting point INDY it was right in there..my bike is 05 WR 450,timing is WR stock,main jet is #168,pilot is#50,needle postion is JD red in the 5th position,Zip TY fuel adjuster is 1 3/4 turns out,elevation is 4200ft.temp is 90-95 degrees right now.mods are AIS removed,DR D race pipe,snorkel out of air box,gray wire clipped,PWR plus sytem inserts,front&back of carb...The bike is a ROCKET everytime I ride it I fall deeper into the BLUE!!!

  • yasotay1

    TT Member

36 posts
Location: Colorado

Posted August 07, 2005 - 03:21 PM


Model 426
Timing WR
Main jet:155
Pilot Jet:40
Fuel screw (turns out):2 zip ty
Needle model/Clip position:3
Airbox lid off
Pipe:big gun race full system
Altitude where you ride:4000-13000+
Temperature where you ride:70-90+
Degree of satisfaction: okay so far, still need to test at high alt.
Power Now,Boyeson acc. pump cover,Big Gun Full system, BK Mod.

  • CuLayTur

    TT Bronze Member

126 posts
Location: Colorado

Posted August 22, 2005 - 07:30 AM


Model 1998 WR 400
Timing YZ
Main jet:165
Pilot Jet:40
Pilot Air Jet: 75
Fuel screw (turns out):2 zip ty
Needle model/Clip position:JD Red in 4th position
Airbox lid off
Pipe:WB E-series w/ 12 disc's
Altitude where you ride:7000-13000+
Temperature where you ride:70-90+
All Free mods
Degree of satisfaction: Never felt this bike run so good. Just plain rips...
Power Now,YZ 450 cam and new Accelerator diaphragm from JDJetting.com with absolutely no bog. :D :D

  • SmallMonkey

    TT Bronze Member

122 posts
Location: California

Posted August 30, 2005 - 03:35 PM


Model (400 - 426 - 450): 2003 WR450F
Timing (WR-YZ): WR
Main jet: 165
Pilot Jet: 50
Fuel screw (turns out): 2 1/4
Needle model/Clip position: Stock needle 5th of 7
Airbox lid (on or off): on
Pipe: Stock - insert removed
Altitude where you ride: SeaLevel -5000ft
Temperature where you ride: 70-105
Degree of satisfaction: 8.5 of 10 - Still bogs just a tad when on the gas hard from idle.


NEW SETTINGS: - Better, but not there yet.
Model (400 - 426 - 450): 2003 WR450F
Timing (WR-YZ): WR
Main jet: 175
Pilot Jet: 50
Fuel screw (turns out): 2
Needle model/Clip position: Stock needle 5th of 7
Airbox lid (on or off): on
Pipe: Stock - insert removed
Altitude where you ride: SeaLevel -5000ft
Temperature where you ride: 70-105
Degree of satisfaction: 9 of 10 - Still bogs just a tad when on the gas hard from idle

  • BergRyder

    TT Member

52 posts
Location: California

Posted August 30, 2005 - 08:25 PM


Model (400 - 426 - 450): 2001 WR426 Supermoto
Timing (WR-YZ): HotCams
Main jet: 175
Pilot Jet: 48
Fuel screw (turns out): 2 1/4
Needle model/Clip position: OBDR R 4th of 7
Airbox lid (on or off): off, holes cut in airbox, K&N filter
Pipe: Yoshimura RS-3 no insert
Altitude where you ride: SeaLevel -3000ft
Temperature where you ride: 70-100
Degree of satisfaction: 9.5 of 10 - Rips, smooth powerband , no flat spots, starts first kick :D

  • 96warrior

    TT Bronze Member

172 posts
Location: Michigan

Posted September 14, 2005 - 10:12 PM


Model (400 - 426 - 450): 2001 WR426
Timing (WR-YZ): WR
Main jet: 170
Pilot Jet: 45
Fuel screw (turns out): stock
Needle model/Clip position: Jd Blue needle, 4'th clipp
Airbox lid (on or off): Off, Uni filter
Pipe: Stock gytr
Altitude where you ride: 1000ft
Temperature where you ride: 60-95
Degree of satisfaction: 9 of 10

  • yamageezer

    TT Bronze Member

213 posts
Location: California

Posted October 11, 2005 - 09:30 AM


Here's mine:

Model (400 - 426 - 450): 2005 WR450
Timing (WR-YZ): WR
Grey Wire: Disconnected
TPS: Connected and adjusted per factory spec.
Main jet: 168
Pilot Jet: 45
Pilot air jet: Stock
Leak Jet: 50
Fuel screw (turns out): Zip-Ty - 1.5 out
Needle model/Clip position: JD Red #4
Air box lid (on or off): snorkel removed/ right side open & powernow
Pipe: YZ w/ Pro Moto end
Air filter: No-Toil
Altitude where you ride: 2500' - 4000'
Temperature where you ride: ~50 - 60 degrees. :lol:

Screams :lol:
I had problems with poor fuel mileage and 1/4 throttle stumble but when I leaned out the pilot circuit WOW better mileage and no more stumble and she is amazingly fast. :banghead: :banghead:

  • adrenalinejunky81

    TT Member

36 posts
Location: Arizona

Posted October 29, 2005 - 02:13 PM


Model (400 - 426 - 450): ;00 WR400
Timing (WR-YZ):Yz
Main jet:168
Pilot Jet:48
Fuel screw (turns out):1 1/3-1 1/2 stock screw
Needle model/Clip position:3rd
Airbox lid (on or off):off
Pipe:FMF Powercore (straight through)
Altitude where you ride:1000ft?
Temperature where you ride:hot (phoenix)
Degree of satisfaction:8 out of 10

  • byggd

    TT Titanium Member

2,923 posts
Location: California

Posted November 06, 2005 - 10:09 AM


Model (400 - 426 - 450): 02 WR426
Timing (WR-YZ): YZ with 03 exhaust cam
Main jet: 170
Pilot Jet: 40
Fuel screw (turns out): 1 1/2
Needle model/Clip position: JD blue needle postion #3
Airbox lid (on or off): Lid Off
Pipe: White brothers e-series w/six discs and quiet core insert
Altitude where you ride: So Cal 0-4000 ft
Temperature where you ride: 40-100
Degree of satisfaction: Runs awesome :banghead: quick response/no bog

  • tony1970

    TT Bronze Member

467 posts
Location: California

Posted November 14, 2005 - 07:22 PM


Model (400 - 426 - 450): 2005 WR450
Timing (WR-YZ):WR
Main jet:#168
Pilot Jet:#45
Leak Jet:#40
Fuel screw (turns out):1 1/4 , Zip TY
Needle model/Clip position:JD Red #4 position
Boysen Quick Shot
Airbox: Snorkel out, punch outs removed with screen installed.
Filter: Twin Air
Pipe: Stock w/ PMB insert
AIS removed with TT Kit
Altitude where you ride:250-2000ft ASL
Temperature where you ride: Now 50-75 Deg F
Degree of satisfaction: 9 out of 10 :applause: Bike rips.

Had problems with the blue needle #3 & 4 position, 1/8 to 1/4 throttle studder. Too rich. Installed Red #4 and cleaned right up. Going to ride a few times and install #40 Leak Jet to compare. :p

12/4/05 Installed #40 leak jet, made a big difference on roll on power. :ride:
1/06 Installed Boysen Quick Shot. Helped w/low end snap.
7/1/06 Lowered needle to Red #3 for hotter weather to lean. Runs awesome! #45PJ (stock) has worked better for me all around in starting and low end.

  • Matty05

    TT Titanium Member

2,451 posts
Location: Australia

Posted November 16, 2005 - 11:46 PM


Model: '05 WR450FT
Timing: WR
Main Jet: 165
Pilot jet: 45
Pilot Air Jet: 80 (stock)
TPS: Connected
ACV: Intact
Grey wire: disconnected
AIS: Sorry, not on Aussie bikes!
Fuel screw: Zip-Ty 1 1/2 turns out
Needle: JD Red #4
Air box: side holes cut out, no snorkel
Pipe: Procircuit Ti4 GP lowboy full system
Fuel: 95 octane premium.

Location: Northern Territory, Australia.
Altitude: Sea level
Temp: 85 - 90*F (~30*c)
Humidity: 80 - 100+%

Satisfaction: 9.8 / 10.
Very crisp and clean running.

  • YamahaWR450FMike

    TT Bronze Member

416 posts
Location: Arizona

Posted November 19, 2005 - 11:05 PM


Model (400 - 426 - 450): 2004 WR450FS
Timing (WR-YZ):WR
Main jet: 168
Pilot Jet: 48
TPS: Connected
Fuel screw (turns out): 1 1/2
Needle model/Clip position: 4
Airbox lid (on or off): On
Pipe: Stock with baffle removed
Altitude where you ride: 500 to 1000ft
Temperature where you ride: 70F - 95F
Degree of satisfaction: Love it. Super fast and runs very nice!




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