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WR400/426/450 Jetting Database




133 replies to this topic
  • dirtysouth

    TT Bronze Member

361 posts
Location: Alabama

Posted June 07, 2006 - 07:13 PM


Model (400 - 426 - 450): 2005 WR450
Timing (WR-YZ): WR
Main jet: 160 (tried 170 & 168 but they were sluggish)
Pilot Jet: Stock 45
Fuel screw (turns out): ZipTy - 1.5 to 2 out
Needle model/Clip position: JD Red #4
Airbox lid (on or off): on...snorkel removed
Pipe: Stock, OEM restrictor removed
air filter: Stock
Altitude where you ride:0-300' ASL (Mobile, AL)
Temperature where you ride: 80-100 degrees now.
Degree of satisfaction ... :D :prof: :prof: waaaaaaaaayyyyy stronger. :applause:

  • temptation2003

    TT Newbie

24 posts
Location: Minnesota

Posted July 02, 2006 - 05:14 PM


Model (400 - 426 - 450):'03 WR450
Timing (WR-YZ):WR
Main jet:168
Pilot Jet:48
Leak Jet:40
Needle model/Clip position:JD RED #5
Airbox lid (on or off):On-snorkle out
Pipe:FMF Titanium PowerCore W/Quiet insert
Altitude where you ride:1000-3000ft
Temperature where you ride:35 deg. to 100 deg farenheight
Degree of satisfaction: :ride: :ride: I installed the kit and
am running a little richer red #5 rather than chance being too lean and the
bike runs EXCELLENT even in cold weather all the way to Swealtering Heat!! :ride:

  • moriboy

    TT Newbie

9 posts
Location: Oregon

Posted August 07, 2006 - 07:58 AM


Model (400 - 426 - 450): 06 WR450
Timing (WR-YZ):YZ
Main jet:168
Pilot Jet:stock
Fuel screw (turns out):1.5
Needle model/Clip position:#3
Airbox lid (on or off):On, side cut out
Pipe:free mod
Altitude where you ride:1000'
Temperature where you ride:80F
Degree of satisfaction:very good

I did the free mods, installed the Gytr ais kit, and it ran pretty good. I had a little burble in the upper mid range, moved the clip to pos 3, runs like a champ now.

  • Guest_thumperyam_*

Posted August 22, 2006 - 05:02 PM


Model (400 - 426 - 450): 06 WR450
Timing (WR-YZ): YZ
Main Jet: 165
Pilot Jet: Stock (45)
Fuel Screw: 1.25 turns out
Needle: Stock shimmed with 2 washers
Airbox Lid (on or off): off, side cut out
Pipe: Stock header, Q2 muffler
Altitude where you ride: 3500-9000ft
Temperature where you ride: 60-90 F
Degree of Satisfaction: Very Good

I did all free mods excluding clutch mod. I found the JD red needle to be too rich unless in 3rd clip position. Runs better with stock needle shimmed. I measured the JD red compared to stock needle and JD is about .001" smaller in dia. throughout.

  • Kmorris

    TT Bronze Member

182 posts
Location: Washington

Posted August 27, 2006 - 10:02 AM


Model (2005 WR 450):
Timing (WR):
Main jet: 168
Pilot Jet: 45
Fuel screw (turns out): 1 1/2
Needle model/Clip position: JD Red - Notch #5
Airbox lid (on or off):Off
Pipe: YZ muffler on WR header pipe
Altitude where you ride: 0-1000
Temperature where you ride: 50-85 Winter/Summer
Degree of satisfaction: As of 27 August 07 - :thumbsup:

It's taken a bit to get here - :ride:

  • sdc

    TT Newbie

11 posts
Location: New York

Posted August 29, 2006 - 06:19 AM


Model :2005 WR 450
Timing : YZ Gray wire disconnect
Main jet:168
Pilot Jet:48 supplied w/ ais kit
Fuel screw (turns out): zip-ty 1 1/2
Needle model/Clip position:yamaha supplied w/ais kit 4th pos
Airbox lid (on or off): baffle removed, side holes cut per Yamaha instructions
Pipe:stock w/ restrictor removed

Bike ran good w stock main jet (155) but seemed hot (header glow), popping on decel
added 168 jet and at same time Zip-ty needle, bike now idles and runs great!
Better idle , good throttle response less popping on decel

  • kskyles

    TT Gold Member

1,297 posts
Location: Arizona

Posted September 08, 2006 - 07:46 AM


Year: 2005
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 165
Pilot Jet: 48
PAJ: Stock
Leak Jet: 50
Starter Jet: 68
Fuel screw (turns out): 1.5 Tusk/Dubach Racing
Needle Model/Clip position: JD Red #5
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): Snorkelectomy
AIS Removed (Y/N): Y
Airfilter Brand: Uni
Exhaust Brand: FMF PowerCore4 with the Quiet Core
Average Altitude: 1000 ft
Average Temperature: spring/fall (75 -90), summer (90-110), winter (45-60)
Average Humidity: ~10%
Degree of Satisfaction (0-10): 10
Additional Mods/Comments:R&D Lightning P-38, Powernow. The summer time is a killer in Arizona, so my jetting gets a lot leaner when it gets hot.

Everyone should have a JD Kit :thumbsup:

  • bandit99

    TT Silver Member

667 posts
Location: California

Posted September 11, 2006 - 07:47 AM


Year: 2005
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: 45
PAJ: Stock
Leak Jet: 40
Starter Jet: 68
Fuel screw (turns out): 1.75 Ty
Needle Model/Clip position: JD blue #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: stock
Exhaust Brand: White Bros E2
Average Altitude: 1000- 4000 ft
Average Temperature: 75
Degree of Satisfaction (0-10): 5
Additional Mods/Comments: Boysen Quick Shot

I fowled a plug running a this setting. This was tood rich. Going to try a 165 main or possible a needle change. I don't see how people can run a 170 main?? I will update when I have it right. Adding the Boysen Quickshot was a big improvement and then lowering the leak jet to a 40 made the low initial grunt better.

  • airhose

    TT Newbie

21 posts
Location: Wisconsin

Posted September 25, 2006 - 06:30 PM


Year: 2006
Model (400 - 426 - 450): WR450F
Cam Timing (WR/YZ): WR
Main jet: 170
Pilot Jet: 48 (GYT-R AIS removal kit)
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 2.25
Needle Model/Clip position: 3rd from top '04 needle (GYT-R AIS removal kit)
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: PMB insert in stock
Average Altitude: 0-1000
Average Temperature: 70
Average Humidity: 80
Degree of Satisfaction (0-10): 10
Additional Mods/Comments: cool stickers, mud, and sticks.

  • Ramcc4x4

    TT Bronze Member

233 posts
Location: California

Posted September 28, 2006 - 12:53 PM


Year: 2006
Model (400 - 426 - 450): WR450F
Cam Timing (WR/YZ): WR
Main jet: 168
Pilot Jet: 45
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 2.0
Needle Model/Clip position: JD Blue 3rd 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: UNI
Exhaust Brand: PMB insert in stock
Average Altitude: 0-1500
Average Temperature: 75
Average Humidity: ?
Degree of Satisfaction (0-10): 8
Additional Mods/Comments: Works fine

  • eightarches

    TT Bronze Member

107 posts
Location: California

Posted October 08, 2006 - 08:22 PM


Year:2004
Model (400 - 426 - 450):450
Cam Timing (WR/YZ):WR
Main jet:170
Pilot Jet:STOCK
PAJ:?
Leak Jet:?
Starter Jet:?
Fuel screw (turns out):2
Needle Model/Clip position:BLUE/3RD CLIP
Grey Wire Mod (Y/N):N
TPS Connected (Y/N):?
Airbox Snorkel/Lid (on or off):ON
AIS Removed (Y/N):NO
Airfilter Brand:STOCK
Exhaust Brand:FMF Q2
Average Altitude:3000
Average Temperature:80
Average Humidity:?
Degree of Satisfaction (0-10):10
Additional Mods/Comments:
STARTS, IDLES, ACCELS, DECELS, GREAT
INCREASE REAR SPROCKET ONE TOOTH
DECREASED FRONT SPROCK ONE TOOTH
NORCAL TRAIL RIDER

  • snakesausage

    TT Bronze Member

122 posts
Location: Texas

Posted October 15, 2006 - 01:51 PM


05' WR450 Jetting Guide for about 500ft above sea level

Winter Jetting
Average ambient temperatures: 40°F to 80°F
Main jet: 168
Pilot Jet: 48
Fuel screw (turns out): ZipTy - 1.5 turns
Needle model/Clip position: JD Red 5th clip
Air box: Snorkel out, "punch-outs" removed
Pipe: stock, plug removed

Summer Jetting:
Average ambient temperatures: 60°F to 100°F
Main jet: 168
Pilot Jet: 45
Fuel screw (turns out): ZipTy - 1.75 turns
Needle model/Clip position: JD Red 4th clip
Air box: Snorkel out, "punch-outs" removed
Pipe: stock, plug removed

These settings were taken from a compilation of several members' inputs. Here is the link to the list of those members' settings. 2005_wr450f_jetting_dbase

  • dwpillar

    TT Newbie

5 posts
Location: New Mexico

Posted October 24, 2006 - 06:01 AM


Year: 2006
Model (400 - 426 - 450): 450
Cam Timing (WR/YZ): YZ
Main jet: 165
Pilot Jet: 50
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 2
Needle Model/Clip position: JD Red #4 clip 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: YZ 450 2005
Average Altitude: 4000 to 6000
Average Temperature: 60 - 80
Average Humidity: low
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: the bike came with 160mj and bike seamed too lean. The 165 mj is better than the 160 for sure. Bike starts great. I put in the powernow and powernow plus and low end is great now(much more responsive). Now I have a stutter while riding down the road at neutral throttle.

  • imj75

    TT Newbie

19 posts
Location: South Africa

Posted October 28, 2006 - 02:50 AM


Year: 2002
Model 426
Cam Timing (WR/YZ): WR
Main jet: 165
Pilot Jet: 65
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 3.75
Needle Model/Clip position: std
Grey Wire Mod (Y/N): N
TPS Connected (Y/N): Y
Airbox Snorkel/Lid (on or off): off
AIS Removed (Y/N): N
Airfilter Brand: Stock
Exhaust Brand: GYTR
Average Altitude: 1500m
Average Temperature: 20-38 Celcius
Average Humidity: low
Degree of Satisfaction (0-10): 8
Additional Mods/Comments: When I got the bike it was idling high, until I turned the idling mix screw from 3 to 3.75. Got it idling very well.
Also down to 3 kicks with choke after 4 weeks. Hot, it starts 1 - 2 kicks.

DO NOT TOUCH THE THROTTLE WHILE KICKING!! :mad:
Cost me about 4 plugs to TRULY understand what that sentence means...

I've done about 300 km on the current plug, no hassles :mad:

  • Gadsen
11,042 posts
Location: Other
Garage View Garage

Posted October 29, 2006 - 10:04 AM


Model : 2004 WR450F
Cam Timing (WR/YZ): WR
Main jet: 165 (stock was 160, this is a Canadian Bike)
Pilot Jet: stock, 45?
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 1.5
Needle Model/Clip position: blue JD #3
Grey Wire Mod (Y/N):N/A (Canadian, no grey mods to do)
TPS Connected (Y/N):Yes
Airbox Snorkel/Lid (on or off):Never a snorkel, (Canadian)
AIS Removed (Y/N):N/A
Airfilter Brand: OE
Exhaust Brand: FMF Powercore4 with quiet core insert
Average Altitude:500-3000
Average Temperature:45-70
Average Humidity:80%>
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: none

  • TheCure

    TT Bronze Member

128 posts
Location: California

Posted November 06, 2006 - 11:00 AM


Year: 2006
Model (400 - 426 - 450): 450
Date:11-6-06
Cam Timing (WR/YZ): WR
Main jet: 160
Pilot Jet: 42
PAJ: stock
Leak Jet: stock
Starter Jet: stock
Fuel screw (turns out): 2
Needle Model/Clip position: Adjustable Needle that comes with GYT AIS blockoff kit. #3 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: Uni with Bel Ray oil
Exhaust Brand: FMF Q
Average Altitude: 5900 - 12,000 feet
Average Temperature: 40-90' f
Average Humidity: low
Degree of Satisfaction (0-10): 9
Additional Mods/Comments: I havent cut out the air box side on the right yet. The bike is very responsive, does not stutter or bobble and runs smooth. I may put a 162 in for MJ to see if I get a gain from it. I had a 45 PJ in and it had a bit of a burble in the lower throttle range.
And, I ride at higher altitudes (usually over 8000feet) and I hate the RICH burble you get from using Indy's chart. I find this bike is sometimes jetted too rich by various peoples advice for high altitude, just like the YZF forum.

Best thing is use these values as baselines and fine tune for your tastes and conditions.

  • 520Roost

    TT Member

36 posts
Location: California

Posted December 04, 2006 - 01:27 PM


Year:2007
Model (400 - 426 - 450):wr450
Cam Timing (WR/YZ):wr
Main jet:170
Pilot Jet:48
PAJ:
Leak Jet: stock
Fuel screw (turns out):2
Needle Model/Clip position: 07yz/3rd
Grey Wire Mod (Y/N):y
TPS Connected (Y/N):y
Airbox Snorkel/Lid (on or off):off
AIS Removed (Y/N):y GYTR kit ( comes with jets)
Airfilter Brand:stock
Exhaust Brand:stock pea shooter removed
Average Altitude:1200
Average Temperature:80
Average Humidity:
Degree of Satisfaction (0-10):10
Additional Mods throttle stop opened up. this bike rips with the stock pipe.:worthy:

  • WR 911

    TT Member

92 posts
Location: California

Posted December 24, 2006 - 03:52 PM


Year: 2007
Model: WR450F
Cam Timing: WR
Main jet: 168
Pilot Jet: 48
PAJ: 70
Leak Jet: 50
Starter Jet: 70
Fuel screw (turns out): 1.25 Zip-ty
Needle Model/Clip position: JD red /#5
Grey Wire Mod: Yes
TPS Connected: Yes
Airbox Snorkel/Lid: Off
AIS Removed: Yes
Air filter Brand: Stock (hole plugged)
Exhaust Brand: Stock w/PMB insert
Average Altitude: 2500
Average Temperature: 75
Average Humidity: 15
Degree of Satisfaction (0-10): 10
Additional Mods: Richen the starter jet for hard starting at 2500'. Throttle stop screw shortened 12 mm (18.2mm from shoulder to tip). Steed wheelies with ease in 1, 2, 3 gears with the stock muffler and PMB insert. Very good throttle response, good for SoCal desert. Made my own AIS block off plate. :thumbsup: :devil: :smirk:

  • wwjam

    TT Newbie

8 posts
Location: New Jersey

Posted March 26, 2007 - 01:39 PM


Year: 2002
Model (400 - 426 - 450): WR426F
Cam Timing (WR/YZ): WR
Main jet: 170
Pilot Jet: 42 stock
PAJ: 75 stock
MAJ: 200 stock
Leak Jet: NA
Starter Jet: 65 stock
Fuel screw (turns out): 1.5
Needle Model/Clip position: Blue JD needle 3rd position
Grey Wire Mod (Y/N): Y
TPS Connected (Y/N): Y adjusted to specs
Airbox Snorkel/Lid (on or off): off
AIS Removed (Y/N): NA
Airfilter Brand: UNI
Exhaust Brand: WB E2
Average Altitude: 0-1000
Average Temperature: 60
Average Humidity: 80
Degree of Satisfaction (0-10): 9 :bonk:
Additional Mods/Comments: Thin JD O-ring used on accel. pump linkage
Lots of low-end grunt and power everywhere on the RPM range.
No more hesitation or missfiring at cruising speed (TPS adjustment fixed that)

  • Looks450

    TT Bronze Member

177 posts
Location: Australia

Posted March 28, 2007 - 02:47 AM


Year: 2007
Model (400 - 426 - 450): WR450
Cam Timing (WR/YZ): WR
Main jet: 170
Pilot Jet: 48
PAJ:?
Leak Jet: STOCK
Starter Jet: STOCK
Fuel screw (turns out): 2
Needle Model/Clip position: YZ 2nd DOWN
Grey Wire Mod (Y/N): N
TPS Connected (Y/N): N
Airbox Snorkel/Lid (on or off): OFF
AIS Removed (Y/N): Y
Airfilter Brand: TWIN AIR
Exhaust Brand: STOCK MODIFIED with GYTR insert
Average Altitude: SEA
Average Temperature: 10-40 CELCIUS
Average Humidity: 50%
Degree of Satisfaction (0-10): 9 With jetting 10 with bike
Additional Mods/Comments:
Everything is now crisp as!!
Looks




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