Products | Yamaha | YZ450F | Yamaha YZ450F 2004
Fits The Following Bikes:Yamaha YZ450F 2003-2005Yamaha WR450 2003-2006 Exhaust Description:The T-4 Slip-On has an impressive design, polished aluminum canister, stainless steel mid pipe and end-cap and ultra-responsive performance. The T-4 Slip-On was developed to increase the horsepower and torque throughout the power curve. This silencer is designed to be used with OEM stock head pipes or Pro Circuit head pipes. Features Include:Incredible horsepower gains when compared to stockAluminum/stainless construction for reduced weight and increased durabilityStrong mounting bracket(s) for increased durabilityDesigned for easy disassembly and re-packing when neededRemovable USFS approved spark arrestor
Ref: 4-STR CYL HEAD MOD
- Modified Head by Pro Circuit *Note: * Indicates parts to be supplied by customer (this cost is for your bare cylinder head, no valves, valve springs etc). If you would like CGH to strip/rebuild your cylinder head this will incurr extra charges.Pro Circuit four-stroke cylinder head tuning to your own cylinder head. Send your cylinder head to CGH and we will forward this to Pro Circuit USA to be modified in house, once this has been completed it will be then returned to CGH and then returned to you.The above cost includes the cost of sending your standard bare head to Pro Circuit USA, modifications by Pro Circuit USA and return to CGH plus all of your import duties, vat, delivery etc (no hidden costs, unless we have to strip your cylinder head valves, valve springs etc - check with us for this cost if required). There is a fine line to building an engine. If the limits are pushed too far (like many engine builders do) there are reliability issues. Pro Circuit's goal is to give you the very best in high-performance service without any loss of reliability. Pro Circuit engine modifications will give you increased power from bottom to top!Pro Circuit has specialized in motor modifications since the early two-stroke Husky days. Our expertise in building the world's most advanced engines is a direct result of working with the fastest and most talented racers. Riders like James Stewart, Ricky Carmichael, Ryan Villopoto, Chad Reed and more have been a great help in our engine development process. In addition, every motor we build is thoroughly tested using our flow bench and race shop dynos. From two-strokes to four-strokes, races bikes to ATV's, almost any machine can benefit from Pro Circuit motor modifications.This modification does not include copper valve seats or installation, this option can be added to your head while at Pro Circuit USA - please contact us for prices.You can also buy a brand new cylinder head from Pro Circuit with these modifications if you have a damaged cylinder head - please contact us for prices.
The JD electronic ignition is used on all our race bikes and improves low- to top-end power while producing a smooth rev-limiting action. This ignition technology gives you a huge advantage over your competition by creating precise timing control for maximum engine performance.
Fits The Following Bikes: Yamaha YZ450F 2003-2009Yamaha YFZ450 2004-2009 (ATV) Cover Description:Pro Circuit Clutch Covers are CNC machined from T-6 billet aircraft-grade aluminum to improve durability and heat dissipation, which improves performance. These covers are designed to be stronger and lighter than the stock clutch cover.
Fits The Following Bikes:Kawasaki KX250F 2004-2019Kawasaki KX450F 2004-2020Suzuki RM-Z250 2004-2006Yamaha WR/YZ250F 2001-2013Yamaha WR/YZ400F 1998-2000Yamaha YZ450F 2003-2013Kawasaki Throttle Tube Description:Pro Circuit throttle tubes are CNC machined out of aluminum, and are Teflon coated on the inside to reduce friction which gives you a smoother twist of the throttle.
Fits The Following Bikes:Yamaha YZ85-450F(Call for application years) Rear Brake Clevis Description:Pro Circuit's Rear Brake Clevis is made from aluminum and comes with an anodized red finish to achieve that "works look". The purpose of the rear brake clevis is to eliminate the free play on the stock brake pedal set-up.
Fits The Following Bikes:Yamaha YZ125 2002-2020Yamaha YZ250 2002-2020Yamaha YZ250X 2016-2017Yamaha YZ450F 2004-2008Axle Blocks Description:The Pro Circuit Axle Blocks are CNC machined from billet aluminum for lightweight and durability. The axle blocks have adjustment lines on the side which make for precise and easy wheel alignment.Features Include:CNC machined from billet aluminumBrown anodizingAdjustment lines for easy wheel alignment
Ref: 24-360 - 24-370
Precision CNC machined from durable, weight saving 6061-T6 aluminum and include pre-drilled safety wire holes for added confidence over the stock nut. Brilliant anodized finish and engraved WC logo\\\'s create that \\\'Factory\\\' look. Pre-drilled for safety wire CNC machined 6061-T6 aluminum CNC engraved WC logos Anodized in Blue, Red or BlackClick here to watch the video...
* One piece cast 6AL-4V Titanium construction yields superior strength and lighter weight than welded Ti pegs * 55mm wide platform with triple cleat design for improved impact dispersion * Open cleat feature to minimize mud buildup * Raised outer teeth for additional grip * Up to a half pound weight savings over stock * Made in the USA Click here to watch the video...
Simple bolt-on item that helps prevent wheelying off the start Billet start button anodized in brilliant Type II RedStainless steel, spring loaded, start pinFork ring hard anodized for durabilityDetailed installation instructions include photos for each stepApproximate install time: 30 minutesDrilling template and countersinking tool includedMade in the USA
Ref: 24-001 thru 24-003
CNC machined from 6061 T-6 aluminum Replaces the stock plastic plug Sealing O-ring includedAvailable Blue, Red or BlackMade in the USA. Click here to watch the video...
Ref: 21-030 thru 21-035
CNC machined from billet aluminum to exacting specifications Polished to a mirror finish prior to anodizing Engraved logo Available in Blue, Red or Black Made in the USAClick here to watch the video...
Ref: 21-700 thr 21-705
CNC machined from billet aluminum to exacting specifications* Polished to a mirror finish prior to anodizing * Engraved logo * Available in Blue, Red or Black anodized finish* Made in the USAClick here to watch the video...
Ref: 31-615 - 31-625
* Vertical throw Hot Start lever design* Simple one finger access and operation* Poly sleeve allows master cylinder assembly to rotate upon impact* Relocates Hot Start to the right hand side of the handlebars* Stainless Steel pivot bushing* CNCd from 6061 T-6 billet aluminum* Available in Blue, Red or Silver * Made in the USA
Ref: 24-530 - 24-535
Precision machined from 6061 T-6 aluminum Simple positive installation with an Allen wrench Replaces the stock plugs Polished to a mirror finish prior to anodizing resulting in a brilliant look Available in Blue, Red or Black Made in the USA Click here to watch the video...
Ref: 17-265 thr 17-320
* Integrated caliper receiver post to ensure precise measurement for true chain alignment* Ultra-slim design precision CNCd from 6061 T-6 billet aluminum* Manufactured with tighter tolerances than O.E.M. parts* Reversible design to keep your axle adjustment bolts from extending beyond their service range* Laser engraved WC logos* Anodized in Blue, Red, Black or Silver (raw)* Made in the USAClick here to watch the video...
Ref: 17-030 to 17-135
Precision CNCd from 6061 T-6 billet aluminumTighter tolerances than O.E.M. parts to help insure accurate alignment of the rear wheel so critical to prolonging chain and sprocket life Reversible design to keep your axle adjustment bolts from extending beyond their service rangeAnodized in Red Made in the USAClick here to watch the video ...
CNCd and formed from aircraft grade 5052 aluminumReinforces radiator to help prevent costly radiator replacement Lightweight, custom fit, tuck in cleanly behind radiator shroudSimple bolt-onMounting hardware included Made in the USAClick here to watch the video - See it in action ...
CNC machined from aircraft grade 6061 T-6 aluminum Type III hard anodized coating for smooth throttle pull Knurled surface for maximum grip adhesionReplaces the stock plastic tube Click here to watch the video ...
CNCd and formed from aircraft grade 5052 aluminum Simple bolt-on installation Smoothes out the rough edges on your bike and creates flatter surfaces for better grip and control All necessary mounting hardware includedMade in the USA
Ref: Fuel Mix Screw
The Pro Circuit fuel mixture screw was designed to make quick and easy adjustments. The knob is easy to grab and adjust even with your gloves on!
Allows No tools tuning to obtain crisp, clean, positive off idle throttle response Includes sealing O-ring, tension spring and washer CNCd 7075 T-7 billet aluminum to precision tolerances EZ Dial knob with laser etched numerals O-ring design helps resist engine vibration to increase product accuracy and longevityClick here to watch the video...
Fits Most Showa/KYB USD ForksEZ push-button operation eliminates harsh, built up air pressure instantlyRelieving air pressure allows your suspension to operate as designedCompatible with Kayaba and Showa upside-down forks equipped with stock bleeder screws Simple installation replaces OE bleeder screws in minutesTwo bleeder valves with adapters included in setClick here to watch the video...
Fits all.Lets air supply into the fuel tank, but stops fuel from coming outInstalls in place of the stock overflow hose in secondsCNC machined from 6061 T-6 billet aluminumAnodized rich Midnight Black with distinctive laser etched WC logoDurable 19mm long mounting hose includedClick here to watch the video...
Used by all major factory teams and ridersImproves clutch performance and lifeImproves heat dissipationPrecision machined from billet T-6 aircraft quality aluminum to aerospace tolerances, and Akadized for five times the wear resistance to stock* (*with proper maintenance)Allows clutch assembly to spin more true creating less heat when clutch is disengagedWhen used with Hinson Clutch Components pressure plate and inner hub helps eliminate clutch chatter
Used by all major factory teams and ridersImproves clutch performance and lifeImproves heat dissipationPrecision machined from billet T-6 aircraft quality aluminum to aerospace tolerances, and Akadized for five times the wear resistance to stock* (*with proper maintenance)Allows clutch assembly to spin more true creating less heat when clutch is disengagedWhen used with Hinson Clutch Components clutch basket and pressure plate helps eliminate clutch chatter