YZ & WR
Athena 480cc Big Bore Kit
- Aluminum cylinder designed with wider water jackets for better cooling.
- Forged hi-compression piston
- Includes all necessary Rings, Clips, and Gaskets.
Hotcams Performance Camshaft
Excellent midrange and top-end increase. Exhaust cam includes auto-decompression mechanism. Uses stock valve springs.
Hi-Flo Oil Filters
YZ/WR 250F '03-'08 & YZ/WR 450F '03-'07
TUV approved high quality paper oil filters. Manufactured to OEM specifications.
Athena 290cc Big Bore Kit
YZ250F 01-07 WR250F 01-09 - Aluminum cylinder designed with wider water jackets for better cooling.
- Forged hi-compression piston
- Includes all necessary Rings, Clips, and Gaskets.
Valve Shim Kit
Includes three valve shims of each size from 1.20 to 3.50mm in .05mm increments. 141 shims in total. 57 cents per shim!
FCR Carburetor "Dial it in" Combo
YZ/WR 250F/400F/426F/450F
Buy both and save! Includes the Boyesen QuickShot 3 and Sunline Mixture Screw
Boyesen QuickShot 3 Accelerator Pump Cover
YZ/WR 250F '01-'08, YZ/WR 400F '98-'99, YZ/WR 426F '00-'02, YZ/WR 450F '03-'08
Designed for Keihin FCR 38, 39, 40, 41 and 42mm
- Eliminates hesitation and bogging
- Provides instant response to throttle movements
- Reduces hot engine stalling
- Improves low end performance
- Bolt-on product that requires no modification
Merge Racing FCR-MX accelerator pump spring
Sunline Calibrated Fuel Mixture Screw
Replaces the stock screw. Easy adjustment, without a screwdriver, of fuel mixture while the bike is running. For Keihin FCR carburetors.
Moose DynoJet Kit
Designed for use with stock engines using either stock or aftermarket exhaust and air filters.
- Provides a simple and affordable solution to carburetor tuning problems
- Allows you to tune your bike for increased power and smoothness while retaining fuel economy
- Includes a guide booklet on how to install and use your jet kit to it's full potential
K&N Air filter
- Designed to increase horsepower and throttle response
- OEM replacement filters designed to fit inside the factory air box
- Larger surface area over foam filters, offers longer service intervals in dusty conditions
- Four layers of premium cotton gauze provides outstanding filtration
Powernow
Highly recommended for trail-riding use on motocross bikes. Improves power delivery at smaller throttle openings, smoothing out throttle response for a more controllable ride.
Powernow Plus
Similar to the Powernow, the Powernow Plus fits to the intake manifold. Can be used in conjunction with the Powernow.
Small Fuel Filters - 90 Degree or straight
Hinson Slipper Clutch
Slipper clutches are designed to reduce the effect of engine braking. They are an essential addition to any race bike and offers better clutch and braking control.
- Provides more controllable downshifting and braking
- Reduces rear wheel lockup and patter caused by excessive engine braking
- Offers better protection against engine and gearbox damage caused by the engine going past redline on a downshift
- Reduced wear and tear on the gearbox
Hinson Slipper Clutches are easy to install and adjust. Highly recommended for non-race applications and beginner to intermediate racers.
Front Sprocket
Machined from impact and wear resistant chromoly steel. Heat treated, then finished with a nickel coating for corrosion resistance.
Rear Sprocket
WR250F, YZ400/426/450, WR400/426F/450 
Black hard anodized alloy sprocket from Moose Racing. Machined sprockets made from 7075 T651 aluminum reduces distortion and provides optimal thickness, to extend sprocket and chain life.
Sprocket bolts
A set of six high quality grade 10 sprocket bolts with locknuts. Threadlock compound has already been applied for extra security.
Shorai Power Lithium Iron Battery
- No more dead batteries. Holds charge for one year without maintenance
- Two to four times the life of lead-acid batteries
- Carbon Fiber Composite Case
- Faster cranking for better starts
- Environmentally friendly, just discharge and dispose
- Ultra light and compact - You could easily carry a spare!
For each motorcycle shown Shorai often, but not always, has three battery options. The first is the Standard Recommendation, second is the Race Recommendation and third is the Duration Recommendation. See below for the explanation of each of these recommendations, sample pricing and weight comparisons against the Yuasa YTZ7S that is standard for the WRF450.
- The Standard recommendation is the best overall pick for most applications, and has been selected to give strong cranking performance and long lifespan. For comparison sake, the LFX09L2 is 3.54 lbs. lighter than the lead-acid Yuasa YTZ7S and is ProCycle priced at $96.95.
- The Race recommendation is for closed-course competition vehicles, and only when every gram of weight counts. Cranking speed and lifespan may be reduced in this case, depending on the starter current draw for your particular vehicle. Not recommended for daily road use, especially in vehicles which have significant Key-Off current draw. The LFX07L2 is 3.33 lbs. lighter than the YTZ7S and is ProCycle priced at just $106.95
- The Duration recommendation is for those who want the strongest possible cranking performance and lifespan, and don’t mind a slight increase in weight and cost compared to the Standard recommendation. Users with extra electrical accessories - like stereo systems used regularly when the vehicle isn’t running - may also choose the duration suggestion. The LFX 14L2 battery is 2.92 lbs. lighter than the YTZ7S and ProCycle priced at only $149.95
Shorai Charger
You can charge your Shorai battery with a regular battery charger but if you want the very best for it, this charger is designed for optimum performance by balancing the individual cells in the battery. Balanced charging ensures the battery reaches its fullest capacity and longest life. 'Store' mode allows long term long term mainenance storage.
Shorai Charge/Store Dedicated Battery Management System for Shorai LFX only. 2A Max charge rate, connects via BMS 5-pin port on LFX batteries. Includes modes for full charge, or long-term storage. Input USA 110~120V 50/60 Hz.
For Shorai Lithium Iron batteries only
Procycle Supermoto 17" Wheel Set
Complete set of supermoto wheels. We custom build our wheels to fit your bike!
Unlike other supermoto wheels that use aftermarket hubs, our supermoto wheels are built on OEM hubs for maximum compatibility with your bike!
Stock hubs allow you to use the rotors and sprockets built for your bike instead of expensive and difficult to obtain parts for aftermarket hubs.
Our Supermoto wheels are carefully laced and trued to provide you with a solid, high-quality wheel.
We use high quality Excel rims and Buchanan's heavy gauge spokes and heavy-duty nipples. All bearings and seals come pre-installed.
- New OEM hubs
- Excel 3.5"x17" front rim, clear-anodized aluminum
- Excel 4.25"x17" rear rim, clear-anodized aluminum
- Buchanan's stainless steel heavy gauge spokes
- Buchanan's heavy-duty zinc-plated nipples
- Bearings and seals pre-installed
All our wheels are custom built to order, please allow 2-3 weeks for delivery.
EBC 320mm Supermoto Front Brake Rotor
YZ/WR 250F/400F/426F/450F '98-'06
- High friction 320mm steel rotors for greater stopping power over stock rotors
- Includes a caliper relocation bracket
- Designed to fit standard hubs
EBC Brake Pads
Sintered Pads are best for regular riding. Long life, and good performance in all conditions.
EBC Front/Rear Brake Rotors
Made with heat-treated carbon steel for longer wear life and reduced galling.
Goodridge Steel-Braided Brake Line
Steel braided brake lines provide better braking power over stock, and greater water resistance. High quality stainless steel braided hose.
Vapor Tachometer / Speedometer
Speedometer:
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Clock:
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Voyager Moto-GPS from Trail Tech
- New! An on-bike GPS system with all the features you've come to expect from Trail Tech
- View, Organize, Edit and Share Entire Trail Systems in 3D
- Designed Specifically to Meet the Needs of Off-Road Riders
- 240x400 LCD display - Readable even in Intense Sunlight
- Crash Resistant, Off-Road Design
- Upload Routes from any GPS
- Customizable User Screens
- Accurate Tracks, Even in the Toughest Terrain
- Runs on Vehicle Power (or internal battery)
- Back-lit for Operation in the Dark
G2 Throttle Cam System
YZ/WR 250F/400F/426F/450F '98-'09
- 3 Different throttle cams to adjust ratio for various types of conditions
- Each cam is designed for different track conditions such as slippery or highly technical conditions
- Billet throttle tube with removable end-cap for hand guard installation
MXHandStand
No more hefting your bike up on a box stand after a race or trail ride. No more burning your hand on the exhaust pipe when you grab the back of your bike to lift it onto your stand. Instead, just press down on the levered handle and easily lift your bike up onto the adjustable platform quickly and easily.
Some of the great features about the MXHandStand:
- Easily leverage your bike up onto a flat, adjustable platform!
- Adjustable platform angle allows either wheel to be elevated
- Foldable to less than 3" for easy transport & storage
- Adjustable for overall height
- Independently adjustable legs compensate for uneven ground
Trail Tech Vapor Dashboard
- Optional plastic dashboard with indicator lights protects the computer and places it in an optimum viewing position.
- Included mounting bracket installs easily to triple clamp of most motorcycles.
- Includes an assortment of indicator light lenses allowing customization to fit your needs.
W.E.R. Steering Damper
Take back control of your bike! Reduces front wheel deflection making your offroad ride more comfortable and controllable.
- Delivers normal damping 25° right and left from center then fades to no damping
- Returning to center there is no damping which improves handling unlike many other brands
- Please allow 10 days for delivery
Lighting Stator
- Separate circuits for lighting and ignition
- 50 Watt lighting output (except 40W on YZ250F)
- Fits under the stock flywheel with no modification
- Replaces the stock OEM stator