20001, 4785M09500, C3066, 71014-5, 5TA-11311-12-00, CR8EIX, 5TA-11311-00-00, 5TG-11633-10-00, 5TG-11603-00-00, 99999-03528-00, 99009-20500-00, 5TA-11181-00-00, 5TA-11351-00-00, 4FM-12213-00-00, 5TA-11311-01-00, 5TA-11311-02-00, 5TA-11311-10-00, 5TA-11311-11-00, 5TG-11631-00-00, 5TG-11633-00-00, 3KS-12213-00-00, 4BE-12213-00-00

0305 YZ450F / 0306 WR450F 480 cc Big-Bore Top-End Rebuild Kit 98 mm Nikasil Cylinder + Forged Piston + Cometic Gaskets

Product Description

Unlock serious, reliable horsepower with this all-in-one 480 cc big-bore top-end rebuild package. The 98 mm Nikasil-plated cylinder drops straight into your YZ450F or WR450F with no machining required just bolt on and ride! Paired with a CP-Carrillo or JEforged piston*, plus a complete Cometic MLS gasket set, heavy-duty cam chain, and titanium head stud kit, this combo adds arm-wrenching torque while staying bullet-proof dependable on the track or trail.

Key Features

• 98 mm Nikasil Cylinder precision-plated for top-tier wear resistance (1-year warranty)

• CP-Carrillo / JE / Wiseco Forged Piston includes rings, wrist-pin & clips for race-grade durability

• Cometic Complete Top-End Gasket Kit MLS head gasket engineered for big-bore compression

• Talon Heavy-Duty Cam Chain thicker side plates handle high-rev stress

• Titanium Head Stud Kit lightweight, stretch-resistant studs hold torque under heat

• Everything in the Box arrives brand-new in original packaging, ready to install

Advantage What It Means for You +3 mm / 480 cc Displacement Massive torque jump & quicker pull out of corners Nikasil vs. cast-iron sleeve Cooler running, longer cylinder life Forged, not cast piston Survives high RPM abuse without skirt collapse MLS head gasket Secure seal under elevated combustion pressures One-year warranty Confidence that your investment is protected

FAQs

Will it fit my bike?
Yes! Direct fit for YZ450F (2003-2005) & WR450F (2003-2006) with 98 mm cylinders.

Do I need special jetting or ECU changes?
A richer fuel setting is recommended to maximize the extra displacement and keep temps down.

Pump gas or race gas?
The kits 11:1 piston works great on high-octane pump gas; race fuel unlocks full potential.

Can I install this myself?
If youre comfortable with top-end service and have a torque wrench, youre set. Otherwise, any experienced engine builder can handle the swap quickly.

Does it include instructions?
A detailed component checklist is provided; follow your factory service manual for specs.

– The Best Parts. The Best Performance. The Best Price. BRAPPPPPPPPPP!