YFZ450 YFZ 450 OEM Crank Big Bore Cylinder Kit Complete Motor Rebuild 98mm 478cc
YFZ450 YFZ 450 OEM Crank Big Bore Cylinder Kit Complete Motor Rebuild 98mm 478cc
Genuine Yamaha OEM, 5TG-11400-31-00,21001-K01,21001, 4044-1E, 4023-1IN, C3068,5TA-11311-12-00, 5TG-11631-11-00, 5TG-11631-12-00, 5TG-11603-00-00, 5TA-12170-00-00, 5TA-12170-10-00, 1PD-12180-00-00, 5TG-12180-00-00, 5TG-12180-10-00, 94591-57118-00, 21001, 13029M09800, C3068, 71014-5, 23001-G01, H1683027S, 5TJ-11631-00-00, MX-09151-1, 202421811570, 23001-K01, A-YFZ-98-CG, P400485100047, 4906M09800, 247952, M1009, 22208
🔥 YFZ450 YFZ 450 OEM Crank Big Bore Cylinder Kit Complete Motor Rebuild 98mm 478cc 🔥
🛠️ Product Overview
Upgrade your Yamaha YFZ450 carbureted model with this comprehensive 478cc big bore engine rebuild kit. Featuring a 98mm BPRATV Nikasil-plated cylinder and a genuine OEM Yamaha crankshaft, this kit delivers enhanced performance and reliability.
✅ What’s Included
- BPRATV 98mm Big Bore Nikasil Cylinder – 1-year warranty
- Genuine Yamaha OEM Crankshaft Assembly – Made in Japan
- Wiseco or CP-Carrillo 98mm 12.75:1 Forged Piston Kit* – Includes high-temp rings, chrome wristpin, and circlips
- MAXLOCK Titanium Cylinder Head Stud Kit – Lifetime warranty*
- SKF or Hot Rods Heavy-Duty Main Crank Bearings
- Transmission Bearing Kit
- Water Pump Rebuild Kit – Includes bearing and mechanical seal
- Complete Gasket Kit – With Cometic Big Bore MLS Head Gasket
- Complete Engine Oil Seal Kit
- BPRATV Heavy-Duty Cam Chain
- BPRATV Heavy-Duty Clutch Kit
🚚 Model Fitment
• Yamaha YFZ450 Carbureted Models Only (2004–2009, 2012–2013)
🔁 OEM Replacement
• Replaces OEM Part Numbers: 5TA-11311-00-00, 5TA-11311-12-00, 5TA-12111-00-00, 5TA-11631-00-00, 5TA-12112-00-00, 5TA-12121-00-00, 3GM-12126-00-00, 5TA-12113-00-00, 5TJ-11631-00-00, 5JG-11603-00-00, 5TA-11633-00-00, 93420-18082-00, 5TA-11351-00-00, 5TA-11193-00-00, 5TA-12114-00-00, 5BE-12117-00-00, 4GY-12117-00-00, 33M-12119-00-00, 4SV-12119-00-00
| Advantage | What It Means for You |
|---|---|
| 98mm Big Bore Cylinder | Increases displacement to 478cc for enhanced power |
| OEM Yamaha Crankshaft | Ensures factory-level reliability and performance |
| Forged Piston | Provides durability and compatibility with pump or race gas |
| Comprehensive Kit | Includes all necessary components for a complete engine rebuild |
❓ FAQs
- Is this kit compatible with fuel-injected YFZ450 models? – No, it's designed for carbureted models only (2004–2009, 2012–2013).
- Does the piston require race gas? – The 12.75:1 compression piston is compatible with high-octane pump gas; race gas is optional for maximum performance.
- Are any modifications required for installation? – No, this is a bolt-on kit with no case or head modifications needed.
🌟 Why Buy from BPRATV?
BPRATV – The Best Parts. The Best Performance. The Best Price.
All items are new, factory-sealed, and backed by full manufacturer warranty.
BRAPPPPPPPPPP!
Enhance your YFZ450's performance with this complete 478cc big bore rebuild kit! 🏁
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NOTICE REGARDING PHOTOS: Product photos used in our listings are for example only to show the high quality of our components. You will receive the correct quantity, size, and fitment of bearings, titanium fasteners, nuts, and bolts for the specific kit listed.
BEARING NOTICE: In some cases, you may receive SEALED bearings. If your application requires an OPEN bearing, the seals can easily be removed.
EMISSIONS & RACE USE ONLY: This product is exempt from emission standards and requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code §§ 27156 and 38391]. Sold ONLY for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing. Installation may void vehicle manufacturers' warranty and/or may be illegal in some locations.
WARRANTY & LIABILITY: © BPRATV LLC 1-year limited warranty from manufacturer for material/workmanship defects.* Due to the nature of high performance and racing, components are sold without express/implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not be liable for specific, incidental, or consequential damages (loss of property, equipment, profits, or revenue) resulting from sale, installation, or use of these parts. This product is NOT DIY; we strongly recommend work be done by a qualified, experienced mechanic.
RETURNS: Returns accepted within 30 days for items 100% complete, brand new, and in original packaging. Items installed or prepped (lubricated/sealed) are ineligible. For warranty consideration, parts MUST be sent back for physical inspection. No exceptions. We do not warranty based on photos, emails, or third-party assessments.
SPECIALTY WARRANTIES: Cub Cylinders: Lifetime warranty for original owner via BPRATV/Millennium Technologies inspection; covers cylinder only. Titanium Fasteners: Failure during use results in replacement only. Neither warranty covers improper tuning, installation, maintenance, or misuse.
INTERCHANGEABLE PARTS: We may substitute parts of equal quality from different manufacturers to prevent backorder delays. Prices and listings subject to change without notice.
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