WR400/426/450 Modification Database

48 replies to this topic
  • theo130578

Posted February 29, 2012 - 04:08 AM


wr 450f 2008 hi guys,
any timing mods like previous models?

  • travertt

Posted March 01, 2012 - 01:23 PM


Model/Year:2004 WR450F..Canadian Model
Engine: All free mods
Carb: Jetted properly
Exhaust: Stock
Fluids: Stock
Suspension: Front..lowered triple trees max amount Rear: Stock
Chassis:Yamalink lowering link ..dropped bike 1.75 inches
Protection: Utah skid plate, Flatland radiator guards, Endro engineering Bark Busters
Tires/Wheels: Front: Pirelli Scorpion Rear: Maxxis IT
Driveline: Standard
Electrical: Mostly standard, new reg/rect...added pneumatic rear brake light switch
Miscellaneous:Street legal,
Cosmetic: Lots of scrathches, worn frame paint, stressed plastic and scuffed engine covers Acerbis 2x35 watt front headlight..goffy looking thing (from previous owner)
Comments: Love it!!!!!!!!

  • n16ht5

Posted March 02, 2012 - 10:59 AM


Model/Year: 2007 WR450

Engine: No-AIS, Twin air filter, opened up air-box, stock engine, Rekluse Z start pro, LHRB w/ 2finger clutch lever

Carb: jetted for free mods

Exhaust:First baffle removed.

Fluids: Valvoline Racing Syn 10-30 or 20-50w

Suspension: Stock

Chassis: Stock

Protection: Barkbusters, Ricochet skid plate, Devol Radiator gaurds, Works Connection radiator braces.

Tires/Wheels: RAD Cush rear hub + heavy duty spokes, Tubliss F/R, MX51 F or D606, MT43 R or Desert IT

Driveline: Supersprox 16/48

Electrical: trailtech 100w stator + regulator / rectal frier, Tusk dual sport kit, heated grips, ADVMonster 3500lumen M60 LED, HID headlight, integrelated GPS + phone + gopro chargers, GPS mou
nt, 12V acc plug, Shorai Lithium battery

Cosmetic: MSR dual sport mirrors on bark busters

Miscellaneous: Dirtbikegear.com small and large fender bags containing:
3.25×21 tube
Tire plug kit
12v Slime air compressor
Cruzer multi tool (sockets, etc)
mini wrenches
crescent wrench
elec tape
zip ties
allen set
small soap bottle
other random tools

tire irons in air box

Comments: WA state license plate

  • Bandit9

Posted August 03, 2012 - 08:16 PM


Model/Year: 2009 WR450 Plated

Engine: AIS removed, UNI air filter, snorkle in air-box removed, YZF Throttle Stop Screw,, Grey Wire snipped, stock engine, fuel filter

Carb: 168 MJ, 45 PJ, 45 LJ, rest of jets are stock,JD Red 4th clip, Merge Racing AP Spring Elevation 0-2000 ft absolutely no bog or hesitation.

Fuel: 93 Ethenol Free

Exhaust:2008 Full YZ450F (shorty) exhaust w/PMB Spark Arrestor End Cap w/o Silent Insert.

Fluids: Shell Rotella every 15 hours

Gearing: 13/50 works everywhere for me, the free flowing engine with YZF Exhaust, well jetted, Merge Ap Spring pulls 13/50 great.

Suspension: Bel Ray 5wt at 124mm, clickers and Sag move around depending where I'm at.

Chassis: Forks flush top clamp, 105 mm race sag .48kg Fork springs, 6.0 Shock Spring, Shorai battery, Guts Tall-Med Seat, Fastway pegs (the spikey ones), TM Designs Chain Slider/Guide, NO Stabilizer and NO Auto Crutch.

Protection: Moose Contour Handguards,, Moose Pro skid plate, Flatlands Radiator gaurds,

Tires/Wheels: Pirelli XC Mid Soft Front MT 16 rear on Silver Excels and Maxxis SI or Michelin S12 for Enduro on Black Excels

Bike runs awesome, very responsive and clean. YZF Exhaust is loud, but I like the power delivery. In about a month I will be installing revalved KYB SSS forks w/.50kg Fork springs, YZF Triple clamps, front hub, axle and spacers. I will also have my 2nd wheel set for just IT Terrain for Mtn and Dual Sport riding.

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  • Dirtyhall

Posted September 15, 2012 - 08:00 AM


I think it might be a good idea to put rider weight in the listings because it would be helpful for the suspension aspect. Suspension mods are done with rider weight in mind, so someone looking to tune their suspension would have a better idea of what mods to do if they knew how much a rider weighed & the mods they did.

  • Dirtyhall

Posted September 17, 2012 - 04:31 PM


Model/Year: 2005 WR450
Engine: AIS Kit, Twin Air Filter, K&N Oil Filter
Carb: Free Mods comepleted: Throttle Stop, Gray Wire, & ACV
Exhaust: Pro Circuit TI-4
Fluids: Maxima Coolanol(w/ water wetter) and engine oil, 7.5# Amsoil Shock Therapy
Suspension: Stock or as set up by previous owner
Chassis: Tag bars and top clamp, Scotts steering damper
Protection: Acerbis Rally Pro Handguards
Tires/Wheels: OEM Wheels w/ Kenda Millville front, Maxxis rear
Driveline: Stock
Electrical: Stock with gray wire mod
Cosmetic: A few scatches and stickers
Miscellaneous: IMS Desert Tank
Comments: Need to tune the suspension.

Rider Weight: 170 w/o gear.

  • yellowhornet18

Posted May 07, 2013 - 11:17 AM


Model/Year: 2000 yz 426
Engine: hot cams exhaust can, k&n filter, the rest is stock
Carb: hand adjustable air screw, that's it
Exhaust: dr. D pipe
Fluids: engine ice
Suspension: n/a
Chassis: (Bars, Grips, Triple Clamps, Levers, Pegs, Brakes, Lines, Modifications, etc.)
Protection: (Skid Plate, Bark Busters, Pipe Guard, Caliper/Rotor Guards, etc.) Han guards an devol rad guards
Tires/Wheels: (Rims, Spokes, Hubs, Tubes, Axles, etc.) stock
Driveline: stock
Electrical: (GPS, Computers, Dual-Sport Kits, etc.)
Cosmetic: (Graphics, Plastic, Seat Covers, etc.) black and white

Model/Year: 2002 yz 426
Engine: (Cams, plugs, Filters, AIS kit, etc.) k&n filter
Carb: (Quickshot, Fuel Screw, Jetting Kit, Modifications, Replacement, etc.) stock- for now
Exhaust: (Can, Header, Mid-pipe, Modifications, etc.) white bros e series
Fluids: (Oil, Coolant, Brake Fluid)
Suspension: (Springs, Fluids, Modifications, Replacements, etc.)
Chassis: (Bars, Grips, Triple Clamps, Levers, Pegs, Brakes, Lines, Modifications, etc.) some kind of aftermarket top triple, super moto front fender
Protection: (Skid Plate, Bark Busters, Pipe Guard, Caliper/Rotor Guards, etc.)
Tires/Wheels: (Rims, Spokes, Hubs, Tubes, Axles, etc.) warp 9 wheels, Michelin pilot powers
Driveline: (Sprockets, Chain) 14/44, standard chain
Electrical: (GPS, Computers, Dual-Sport Kits, etc.) Baja kit an electrical stator, spliced in pigtail for battery charger, trail tech vapor computer.
Cosmetic: (Graphics, Plastic, Seat Covers, etc.) working on the graphics

  • jojo1224

Posted May 07, 2013 - 01:04 PM


I know its not a wr but close enough.

Model/Year: 2000 yz426
Engine: Ported Head, Hot cams, Kibble white valves, Wiseco 95mm 12.5:1 piston, rebuilt crank, new cylinder, all new bearings, full hinson clutch. Cracked the cylinder last year running a 13.5:1 JE +2mm 444cc setup.
Carb: Zipty fuel screw, 168 main (?), oring mod, uni dual stage filter
Exhaust: Stock yz exhaust cut down 4 inches off the can (looking for a full system)
Fluids: Prestone coolant, Belray DOT 5.1 silicone brake fluid, Trying a few different oils, rotella, amsoil, belray
Suspension: Stock valving and springs so far, will revalve later. Forks and shock fully rebuilt all wear parts replaced and fluids done with 0 hours right now.
Chassis: Renthals with a riser, Powdercoated wrinkle black frame/subframe/swingarm, Braided Stainless brake lines, billet wide pegs, all bearings replaced, Acerbis plastics + tank, tm design works sliders/guides, ebay oversized rads
Protection: Stock skid plate
Tires/Wheels: Excel stainless spokes, Rims painted with black wheel paint, Hubs smoothed and painted black with duplicolor wheel paint
Driveline: 14/42 steel sprockets, RK 520 chain
Electrical: Stealth Black Trailtech Vapour, Watercraft style tether switch added to bars
Cosmetic: Gripper seat cover with shaved seat foam
Comments: Missing a bunch of small things, I am building a Big Bore Stroker engine using 426 cases, wr trans, wr lighting, 450 +3mm cylinder, ported big valve 450 head, not sure on which stroker crank and cams and piston yet. Also working on fuel injection using microsquirt.

  • Dakar Dan

Posted August 22, 2013 - 03:27 PM



Model/Year: 2011 WR450F
Engine: Stock, no AIS fitted in Oz.
Carb: 45PJ, 168MJ, O ring mod, JD Blue needle, brass idle jet, TwinAir with Belray filter oil.
Exhaust: Stock with GYTR tip
Fluids: BelRay Thumper 10w40
Suspension: Stock, forks raised 3mm 
Chassis: Stock
Protection: Force bashplate, Barkbusters Ego handguards with triple clamp mounts, ghetto style gutter guard rad shields, Acerbis blue chain guide & slider
Tires/Wheels: Bridgestone M404
Driveline: Stock 13/50
Electrical: Shorai lithium battery, removed all of the road registration gear that comes fitted in Oz.
Cosmetic: One Ind sticker kit
Miscellaneous: Clarke 13litre fuel tank
Comments: Awesome bike. I have derestricted it for smoothness and modded it for reliability & range rather than outright power gains. 


Edited by Dakar Dan, August 22, 2013 - 03:29 PM.


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