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WR400/426/450 Jetting Database




133 replies to this topic
  • Robert_Brazil

    TT Bronze Member

200 posts
Location: Other

Posted March 02, 2005 - 07:38 AM


[COLOR=Blue]WR400/WR426/WR450 Jetting Database Instructions[/COLOR]

The purpose of this thread is to provide a comprehensive database for jetting the various models of the WR. It is not intended as a thread to directly solicit or offer help and/or advice. In other words, "Just the facts, Ma'am"

When posting to this thread, please use the following format:

Year:
Model (400 - 426 - 450):
Cam Timing (WR/YZ):
Main jet:
Pilot Jet:
PAJ:
Leak Jet:
Starter Jet:
Fuel screw (turns out):
Needle Model/Clip position:
Grey Wire Mod (Y/N):
TPS Connected (Y/N):
Airbox Snorkel/Lid (on or off):
AIS Removed (Y/N):
Airfilter Brand:
Exhaust Brand:
Average Altitude:
Average Temperature:
Average Humidity:
Degree of Satisfaction (0-10):
Additional Mods/Comments:

In an effort to keep the database streamlined and uncluttered, conversational posts will be deleted. If you need to update your settings, send me your changes via PM and I'll enter them for you so we don't get duplicates. Thanks for your help :) ...SC

  • motodude42

    TT Bronze Member

140 posts
Location: Idaho

Posted March 02, 2005 - 12:48 PM


Model (400 - 426 - 450): 2005 WR450
Timing (WR-YZ): WR
Main jet: 168
Pilot Jet: Stock, 45?
Fuel screw (turns out): ZipTy - 2 out
Needle model/Clip position: JD Blue #3
Airbox lid (on or off): snorkel removed
Pipe: Stock, baffle completely removed
air filter: Stock
Altitude where you ride: 2500 - 4000 ASL
Temperature where you ride: ~50 - 60 degrees now.
Degree of satisfaction :)

  • Indy_WR450

    Get Help Now

5,303 posts
Location: Colorado

Posted March 02, 2005 - 08:47 PM


Here is what works for me and you guys can use it as a starting point to jet your WR450 bikes only! :)

(Note: do not use these for WR426 or WR400 due to carb differences!) :)

This recommendation requires air box flow mods and an open stock or aftermarket pipe and ACV circuit intact. :p

Elevation 0 to 4,000. feet

30 to 45 degrees: 172 main, JD Blue #5, 48 Pilot, 2.0 turns, 75 starter jet, #0 leak jet
45 to 60 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
60 to 75 degrees: 168 main, JD Blue #3 or JD Red #5, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 2.0 turns, 65 starter jet, #60 leak jet

Elevation 4,000 to 8,000 feet:

30 to 45 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
45 to 60 degrees: 168 main, JD Blue #3, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 45 Pilot, 2.0 turns, 65 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 1.75 turns, 65 starter jet, #60 leak jet


Elevation 8,000 to 11,000 feet: ( Note you will loose a lot of power due to altitude but your bike will idle and not foul plugs!)

45 to 60 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 160 main, JD Red #4 , 45 Pilot, 1.75 turns, 68 starter jet, #50 leak jet
75 to 90 degrees: 158 main, JD Red #3, 45 Pilot, 1.5 turns, 65 starter jet, #60 leak jet

  • timcook

    TT Member

88 posts
Location: Arizona

Posted March 02, 2005 - 09:10 PM


Model: 2005 WR450
Timing: WR
Main Jet: 170
Pilot Jet:Stock 45 drilled to 48
Starter Jet: 75
Leak: stock #50
Fuel screw: Zyp Ty 1 3/4 turns out
Needle: JD red 4th clip
Air box: snorkle removed and tray cut open
Pipe: Stock with baffled removed
Altitude: 0-2000K
Temp:current 45-80F
Humidity: 50-60%
Degree of statifaction: bike is great,no bog, good throttle response(need to drecrease leak jet to Indy's idea of zero)
Note: the weather here is about to drastically change to over 100F and the humidity will drop to single digits. All this jetting will change!!!!!!!!!

  • clark4131

    TT Titanium Member

2,218 posts
Location: Nevada

Posted March 02, 2005 - 10:33 PM


Year: 2005
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: 45
PAJ: 80
Leak Jet: 42
Starter Jet: 70
Fuel screw (turns out): Zip-TY 1.5
Needle Model/Clip position: JD Blue #3
TPS Connected (Y/N): Yes
Grey Wire Mod (Y/N): Yes
Airbox Snorkel/Lid (On/Off): Snorkle-ectomy w/ Airbox Knockouts + PowerNow
AIS Removed (Y/N): Yes
Airfilter Brand: Twin Air
Exhaust Brand: DR.D SA w/ FMF SX Powerbomb
Average Altitude: 4500-6000
Average Temperature: 40°-50°F
Average Humidity: 45%
Degree of Satisfaction (0-10): 10
Additional Mods/Comments:

13/49 Ironman Sprocket Set

Fun Factor: 11 Bananas... :) :D :D :D :thumbsup: :) :p :D :D :o ;)

  • Lowedog

    TT Bronze Member

361 posts
Location: Washington

Posted March 02, 2005 - 10:47 PM


Model (400 - 426 - 450):'03 WR450
Timing (WR-YZ):WR
Main jet:168
Pilot Jet:48
Leak Jet:40
Pilot Air Jet:100
Fuel screw (turns out):1-1/4-1-3/4
Needle model/Clip position:JD Blue #4
Airbox lid (on or off):On-snorkle out
Pipe:Thunder Alley ceramic coated w/SA
Altitude where you ride:800-4000ft
Temperature where you ride:70 deg. ideal for these settings
Degree of satisfaction: :) :)

  • tgodwin

    TT Bronze Member

153 posts
Location: California

Posted March 09, 2005 - 10:42 AM


Model (400 - 426 - 450): 1999 WR400F
Timing (WR-YZ): WR
Main jet: 172
Pilot Jet: Stock, 45
Fuel screw (turns out): ZipTy - 2 out
Needle model/Clip position: Stock
Airbox lid (on or off): snorkel removed
Pipe: White Brothers E-series
air filter: Twin Air
Altitude where you ride: 2500 - 5500 ASL
Temperature where you ride: ~40 - 70 degrees now.
Accelerator Pump Cover: Factory R&D P-38
Degree of satisfaction: Runs well. Still dialing it in. Crisp response, may be a bit rich.

  • Stonie426

    TT Member

39 posts
Location: United Kingdom

Posted March 27, 2005 - 07:38 AM


Model (400 - 426 - 450): '02 426
Timing (WR-YZ): WR
Main jet: 170
Main air jet: 200
Pilot Jet: 45
Pilot air jet: 100 PAS
Fuel screw (turns out): 1 1/3
Starter jet: 72
Leak jet: N/A
Needle model/Clip position: EMN/4
Airbox lid (on or off): OFF
Pipe: Jardine RT-4
Altitude where you ride: 400 Ft
Temperature where you ride: 70-80 F (now)
Humidity: 50-60% (now)
Degree of satisfaction: :)
Others: BK mod (0.9mm gap), Power Now (home made), ACV disabled, AP cover mod (home made Boyesen)
Comments: NO bog, sputter, flat spot, popping or backfire

  • Texas4play

    TT Silver Member

588 posts
Location: Texas

Posted March 28, 2005 - 07:10 PM


Model : '05 WR450
Timing (WR-YZ): Stock WR - Gray wire pulled
Main jet: 170
Pilot Jet: Stock
Fuel screw (turns out): Zip-Ty 1.75
Needle model/Clip position: JD Red #4
Airbox lid (on or off): On
AIS: Gone
Pipe: Stock w/PMB insert
Altitude where you ride: 500'
Temperature where you ride: 100 degrees
Degree of satisfaction: 10

  • Seabass

    TT Bronze Member

473 posts
Location: Yap

Posted March 28, 2005 - 07:41 PM


Model- 2005 WR 450
Timing-WR with grey wire pulled
MJ-168
PJ-48
LJ- stock
Needle- JD Blue, #3 Position(Winter, So Cal Deserts) JD Red Needle #5 Position (Spring, Summer, So Cal Deserts)
R&D P-38 accelerator pump cover
Air snorkel- removed
Fuel screw- Zip-Ty 1 1/2 to 1 3/4
Exhaust- Stock with baffle removed and PMB insert.
Elevation- 500 to 2000 feet above sea level
Temp- 60's to 80's
Degree of satisfaction- I'm dialed in and stoked!!!!! :naughty:

  • Dan_Lorenze

    TT Addict

4,773 posts
Location: California

Posted March 29, 2005 - 09:31 AM


Model: 2005 WR450f US model
Cam Timing: WR (stock)
Main Jet: 170
Pilot Jet: 48
Fuel screw: MSR Hard Parts - 2 out (about)
Needle model/Clip position: 04 WR 4th pos
Starter Jet: 70
Leak Jet: 40 (50 is stock)
Accelerator pump cover: Factory R&D "Lightning"
Airbox lid (on or off): snorkel removed
AIS: Mark Lowe's Smog removal kit
Pipe: Yamaha GYT-R Aluminum slip-on Quiet cap
Air filter: UNI-This filter is a work of art!
Altitude where you ride: Sea level to 4000
Temperature where you ride: Varies, mostly 70s-80s

Degree of Jetting satisfaction: 10 :naughty:

  • WR450_in_Turkey

    TT Member

79 posts
Location: California

Posted March 31, 2005 - 10:00 PM


Model (400 - 426 - 450): 03 WR450 European model
Timing (WR-YZ): WR No grey wire on EU model
Main jet: #160
Pilot Jet: #48
Fuel screw (turns out): 1.25
Needle model/Clip position: OBDUQ-4
Airbox lid (on or off): No snorkel lid still on!!? Holes cut above rear mudguard(fender)
Pipe: FMF PC4 with SA and quiet insert
Altitude where you ride: 0- 2000ft
Temperature where you ride: 15 to 45 degC
Degree of satisfaction: :naughty: :naughty: :D

  • Ivan450

    TT Newbie

13 posts
Location: Australia

Posted April 02, 2005 - 04:00 PM


Model (400 - 426 - 450): 03' WR 450 Aust model
Timing (WR-YZ): WR
Main jet: #160
Pilot Jet: # 45 (#48 Std)
Fuel screw (turns out): 1 1/2
Leak Jet: # 40 (#50 Std)
Needle model/Clip position: JD Red / pos 5
Airbox lid (on or off): off snorkel removed 2x45mm holes drilled
Pipe: Stock w/screen removed
Altitude where you ride: 0-1000ft
Temperature where you ride: 90deg+ 70%-90% humidity
Degree of satisfaction: 8/10

I think a pipe would help and now I see the thread for the Acc pump cover, looks like my satisfaction rating will go up with that puppy if I can find one. I like techo hills, so I'd say this mods for me.

  • Masta_P

    TT Newbie

12 posts
Location: Washington

Posted April 05, 2005 - 08:08 AM


Model (400 - 426 - 450): 2003 WR450F
Timing (WR-YZ): YZ
Main jet: 162
Pilot Jet: 50
Fuel screw (turns out): 1 3/4
Needle model/Clip position: 4th
Airbox lid (on or off): off
Pipe: Yoshimura Off-Road Slip on (very loud)
Altitude where you ride: 2000-7000ft
Temperature where you ride: 45-90
Degree of satisfaction: Very

My e-button would never work until I performed these changes...I love this bike finally, and it never backfires! :naughty:

  • Domenic_WRF

    TT Platinum Member

1,659 posts
Location: Idaho

Posted April 09, 2005 - 02:16 PM


Model WR400 1999...acv removed..snorkle removed..grey wire cut..WB E-2..
YZ450 Cam..elevation 0 to 7000 feet..80 degrees F+
EKN needle clip 3 or JD blue clip three year round w/ fuel screw adj. only..
160mj
160 maj
40pj
75paj
70sj
.5 apj taffy mod
FS 1 to 1.5 turns

2005 WR450..WR timing..grey wire cut..air box mod..PMB exhaust insert. Zip-ty FS..0-7000 feet..40 to 90 degrees F..acv intact

JD Red clip5
170 mj
200 maj
45 pj winter 48pj
75 paj
65 sj winter 72sj
50 leak jet
FS 1.5 to 2.0

  • FTD

    TT Gold Member

1,163 posts
Location: Idaho
Garage View Garage

Posted April 09, 2005 - 04:31 PM


Model: '01 WR426
Timing:YZ
Main jet: 162
Pilot Jet: 40
Fuel screw (turns out): 2
Needle model/Clip position: 2
Airbox lid: off
Pipe: FMF Powercore 4 II
Altitude where you ride: 5,000-9,500
Temperature where you ride: lets say 50-75...although 32-90 at times.
Degree of satisfaction: :naughty:

  • DesertWR

    TT Bronze Member

183 posts
Location: California

Posted April 12, 2005 - 01:00 PM


Model (400 - 426 - 450): 05' WR 450F
Timing (WR-YZ): WR
Main jet: #170
Pilot Jet: # 48 (#48 Std)
Fuel screw (turns out): 1 3/4
Leak Jet: # 40
Needle model/Clip position: JD Red / pos 5
Airbox lid (on or off): off snorkel removed 2x45mm holes drilled
Pipe: White Brothers E2
Altitude where you ride: 0-3000ft
Temperature where you ride: 65-90deg
Degree of satisfaction: 9/10

  • xlr8

    TT Bronze Member

163 posts
Location: Georgia

Posted April 16, 2005 - 05:09 AM


'05 WR450F

JD blue needle #3
170mj

The rest is stock. All of the free mods done, plus AIS block off kit. I've had zero problems since installing his kit. The only things I've had to change were the clip position (#4 down to #3) and dropped the mj from 170 to 168. I'm just above sea level, and the bike runs GREAT!!! :naughty:

  • jwriott

    TT Addict

3,567 posts
Location: Colorado

Posted April 20, 2005 - 08:19 AM


I sold my bike to BrandonW but I had the LarryCo Jetting

Model 2001 WR426:
Timing YZ timed, WR timing required no change in jetting
Main jet: 155
Pilot Jet: 38
Pilot Air Jet: 65 Adjustable from Sudco
Fuel screw: 2 Turns out
Needle model/Clip position: EKP #3 Position
Airbox lid: Off
Pipe: FMF Q or Stock Open
Altitude where you ride: 5,000'-13,000'+
Temperature where you ride: 30F-95F
Degree of satisfaction: 9+ out of 10

Other:
BK Mod with Screw and nut, timed to 1/3-1/2 second.
Grey wire unplugged
Throttle Stop Cut

152 main for 10,000+ Feet
160 main for Moab which is around 4500 feet

If using a PMB or GYRT insert, I had both.
148 main for 10,000 feet
152 main for all other Colorado riding
155 main for Moab

My bike ran great like this and all I had to change for altitude was the main. I had fouled tons of plugs with the original jetting and this solved my problem completely. LarryCo did a ton of work on this jetting with the help of Taffy. I was just lucky enough to come in after they finished. :naughty:

  • Yamahondaha

    TT Bronze Member

353 posts
Location: California

Posted May 02, 2005 - 09:10 AM


Model (400 - 426 - 450): 1999 WR400F
Timing (WR-YZ): WR
Main jet: 170
Pilot Jet: Stock, 45
Fuel screw (turns out): 2 out
Needle model/Clip position: JD red on the 4th groove
Airbox lid (on or off): snorkel removed
Pipe: FMF Powercore 4
air filter: stock
Altitude where you ride: 0 - 500 ASL
Temperature where you ride: ~60 - 70 degrees now.
Accelerator Pump Cover: stock with an after market diaphragm w/longer stud (squirts sooner)
Degree of satisfaction: Runs great! I snipped the gray wire, shortened the throttle stop, added a JD needle and a quicker shooting diaphragm for snappy no bog acceleration...The biggest improvement came after the JD triple taper needle, this bike rips now! Thanx JD




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