Rebuild YZ450F WR 450F Big Bore Motor Build Service 500cc Assemble YOUR Engine!
Yamaha WR450F 500cc Big Bore Engine Rebuild Service – Complete Motor Build by BPRATV
⚙️ Complete Professional Engine Rebuild – You Send It, We Build It!
When it comes to rebuilding your Yamaha WR450F or YZ450F engine, trust BPRATV — the proven name in high-performance and reliability. Simply send us your complete engine, and our expert technicians will handle the entire process from teardown to final assembly. Unlike “shops” that just clean and reassemble, BPRATV delivers a true professional rebuild that restores your motor to better-than-new performance. This is a full 500cc Big Bore Engine Build Service designed for both serious racers and riders who want dependable power every ride.
🔥 Key Features & Benefits
Every rebuild is done with precision craftsmanship and premium components — all new, all installed by skilled technicians.
- BPRATV Big Bore Cylinder – OEM-spec precision for durability and long life
- Wiseco, JE, or CP Forged Piston* – race-proven design for maximum compression on pump gas
- Hot Rods or Wiseco Crankshaft Assembly – completely new crank with connecting rod installed
- Crank Bearings, Balancer Bearings, Transmission Bearings, Shift Cam Bearings – all new, all OEM-spec replacements
- Clutch, Starter Clutch, Arm Bearings – complete replacement ensures smooth clutch and start engagement
- Maxlock TITANIUM Head Stud Kit – lifetime warranty, prevents head lift under extreme compression
- Complete Gasket Set – including Cometic MLS Head Gasket for superior sealing
- Oil Pump + Water Pump Shaft with Impeller – new and preassembled for maximum flow and reliability
- K&N Oil Filter + Complete Oil Seal Kit – keeps your motor protected and leak-free
- Cam/Timing Chain & Guides – precision-timed installation for consistent valve performance
- Valve Stem Seals + Clutch Kit – everything replaced for a completely refreshed top and bottom end
🧰 Professional Labor & Expert Assembly
Your rebuild is performed by highly experienced engine builders with race-level precision. Every step is done right the first time.
- Complete teardown and detailed inspection of your engine
- Thorough cleaning and ultrasonic flushing of cases and internal components
- Professional valve service including 3-angle valve and seat cuts, lapping, and assembly
- Sandblasting of cases and cylinder head for clean, uniform finish
- Sizing and gapping of piston rings to precise bore measurements
- Camshaft installation, shimming, and timing set to factory performance spec
- Final torque and inspection on all fasteners using manufacturer torque charts
✅ Compatibility
This rebuild service applies to the following Yamaha models and engines:
- 2003–2005 YZ450F engines
- 2003–2006 WR450F engines
- Lead time: approximately 4–5 weeks from the date we receive your engine
- All parts and labor covered under a 1-year limited warranty*
- Every build includes detailed inspection and optional performance upgrades
💪 Optional Upgrades & Add-Ons
Customize your build for racing or enhanced reliability with premium upgrades:
- Assembled cylinder head with Kibblewhite valves & springs – $1850
- Full race-ported and polished cylinder head – $2250
- Installation for either head option – $250 ($400 with cams and timing setup)
- Hot Cams performance camshafts – $350
- Web Cams racing camshafts – $600
- New OEM clutch cover – $120 (used available for $50)
- Many other parts and performance options available – contact us for details
❓ Frequently Asked Questions (FAQ)
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Q: What do I need to send?
A: Please send your complete WR450F or YZ450F engine. We’ll handle every aspect of teardown, inspection, and rebuild in-house.
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Q: How long does the rebuild take?
A: Typical turnaround time is about 4–5 weeks after receiving your engine.
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Q: What’s included in the price?
A: All internal parts, precision labor, and a 1-year limited warranty on both parts and workmanship.
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Q: Can I add performance upgrades?
A: Absolutely! We offer Kibblewhite valves, ported heads, Hot Cams, Web Cams, and more. Just let us know your goals.
🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟
At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. For over two decades, we’ve specialized in Yamaha rebuilds and performance engines that deliver power, reliability, and precision craftsmanship. Every motor is assembled by experts using only trusted components from Wiseco, JE, Hotrods, Kibblewhite, and Cometic. Trust BPRATV to keep your Yamaha WR450F or YZ450F running at its best, every single time.
Send in your WR450F engine today and experience a true BPRATV-built 500cc powerhouse!
BPRATV - The Best Parts. The Best Performance. The Best Price.
BRAPPPPPPPPPP!
© BPRATV LLC
