YAMAHA B4M-F6206-V0-00 Crankshaft Bearing 93306-30633

( Manufacturer Part Number: B4M-F6206-V0-00 ), ( Part Type: Bearing Crankshaft ), ( Country Of Origin: Japan )

Review YAMAHA Oem Crankshaft Bearing fits YZ450F

The **Yamaha YZ450F Crankshaft Bearing (Part Number: 93306-30633, Model Code: B4M-F6206-V0-00)** is a precision-engineered component designed to deliver exceptional performance, durability, and reliability in the high-stress environment of a high-performance dirt bike engine. This bearing is a critical part of the crankshaft assembly, serving as the foundational support for the main journals and connecting rods, ensuring smooth rotation while withstanding extreme forces generated during aggressive riding, high-revving conditions, and intense cornering. Crafted from Yamaha s proprietary high-grade materials, this bearing is engineered to minimize friction, reduce wear, and maintain optimal lubrication efficiency, even under the most demanding circumstances. Its robust construction features a robust steel backing paired with a specialized bearing surface, optimized for both load-bearing capacity and thermal stability, allowing it to endure prolonged use without deformation or premature failure. The bearing s design incorporates advanced manufacturing techniques, including precision machining and heat treatment, to achieve an ultra-smooth surface finish that enhances oil retention and reduces metal-to-metal contact, thereby extending the lifespan of the entire crankshaft assembly. Whether used in stock applications, aftermarket modifications, or competitive racing setups, this bearing is a testament to Yamaha s commitment to performance engineering, offering riders the confidence of a dependable component that can handle the rigors of motocross, enduro, or track racing with ease. Its compatibility with the YZ450F s engine ensures seamless integration, providing a perfect balance of strength and efficiency for those seeking to maximize power output while maintaining structural integrity.

### **Pros and Cons of buying a Yamaha B4M-F6206-V0-00 (93306-30633) YZ450F Crankshaft Bearing**

1. **OEM Quality** This is an original Yamaha part, meaning it meets the manufacturer s exact specifications for fit, performance, and durability. It is designed to match the engine s internal tolerances precisely, reducing the risk of premature wear or failure.

2. **Reliability** Yamaha s aftermarket and OEM parts are known for their high quality and longevity. The crankshaft bearings in this part number are engineered to handle the stress of high-RPM performance, making them suitable for both street and off-road use.

3. **Compatibility** This bearing is specifically designed for the **Yamaha YZ450F**, ensuring a perfect fit without modification. It replaces the stock bearing in the crankshaft assembly, which is critical for smooth operation and power transfer.

4. **Performance Stability** High-quality bearings reduce friction, which helps maintain engine efficiency, power output, and longevity. Poor-quality or worn bearings can lead to increased drag, overheating, or even catastrophic engine failure.

5. **Ease of Installation** Since it is an OEM part, it should fit seamlessly into the existing crankshaft assembly with minimal adjustments. This makes it a straightforward upgrade or replacement for mechanics with basic tooling.

6. **Warranty Coverage** If purchased directly from Yamaha or an authorized dealer, this part may come with a warranty, providing peace of mind against defects.

7. **Prevents Costly Damage** Worn or failing crankshaft bearings can cause severe engine damage, including rod bearing failure, piston damage, or even a seized engine. Replacing them proactively can save hundreds or thousands in repair costs.

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1. **Cost** OEM parts are generally more expensive than aftermarket alternatives. While this bearing is high-quality, its price may be prohibitive for budget-conscious buyers, especially if they are replacing multiple components.

2. **Limited Availability** Depending on the region, finding this exact part number may require ordering from a Yamaha dealer, an online specialty store, or a distributor. Availability could be a concern if you need the part urgently.

3. **Installation Requires Skill** While the part itself is straightforward, removing and installing a crankshaft bearing often involves disassembling the engine, which requires mechanical expertise. Improper handling can lead to damage to other components (e.g., seals, gaskets, or the crankshaft itself).

4. **Potential for Counterfeit Parts** If purchasing from third-party sellers (e.g., eBay, Amazon, or unverified online marketplaces), there is a risk of receiving counterfeit or low-quality replicas. Always verify the seller s reputation and authenticity.

5. **Not a "Performance Upgrade"** Unlike some aftermarket bearings designed for increased load capacity or durability, this is a direct OEM replacement. It will not improve power or handling beyond stock specifications.

6. **Wear Over Time** Even high-quality bearings will eventually wear out, especially with heavy use (e.g., aggressive riding, frequent high-RPM operation, or off-road abuse). Regular maintenance and inspection are necessary to catch wear before failure.

7. **Environmental Factors** If the bike is ridden in extreme conditions (e.g., dusty off-road terrain, high humidity, or saltwater exposure), the bearings may degrade faster due to contamination or corrosion. Additional protection (e.g., seals, lubrication) may be needed.

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The **Yamaha B4M-F6206-V0-00 (93306-30633) crankshaft bearing** is a **high-quality, reliable OEM replacement** that ensures proper engine function and longevity for the YZ450F. It is the **best choice for owners who prioritize durability, fitment, and peace of mind**, especially if the bike is used heavily or shows signs of bearing wear (e.g., unusual noise, vibration, or oil contamination).

However, the **higher cost and potential installation complexity** make it less ideal for casual riders or those on a tight budget. If the bike is not showing severe symptoms of bearing failure, delaying replacement until symptoms appear may be a cost-effective alternative.

For riders who want a **balance of quality and affordability**, **aftermarket bearings from reputable brands** (e.g., **NSK, INA, or JE** if compatible) could be considered, though they may not offer the exact same fit or warranty as OEM.

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- You are experiencing **visible signs of bearing wear** (e.g., oil leaks, unusual noise, or vibration).

- You want **maximum reliability and warranty coverage**.

- You are comfortable with **engine disassembly** or have a mechanic perform the installation.

- Budget is not a major concern, and you value **long-term engine health**.

- The bike is **not showing severe symptoms** of bearing failure.

- You want to **save money** while still using a high-quality bearing (e.g., **NSK or INA bearings**, if they match the part number).

- You are **not experienced with engine work** and prefer a simpler replacement process.

- **Avoid third-party sellers unless verified** to prevent counterfeit or low-quality parts.

- **Always inspect the crankshaft and other components** (e.g., seals, gaskets) during replacement to ensure no additional damage exists.

For most serious riders, **the OEM bearing is the safest and most practical choice**, especially if the bike is used aggressively. However, weigh the cost against the urgency of replacement to make the best decision.

Details:

Box has writing on it.

part #: b4mf6206v000 prices

• $24.88-$75.00

specifications cyclevintagee:

• for models: Yz450f
• for makes: Yamaha
• mpn: B4m-f6206-v0-00
• part type: Bearing Crankshaft
• country of origin: Japan

seller cyclevintagee:

• city: Waterloo, Illinois
• # reviews: 980
• rating: 100.0%

offer cyclevintagee:

• sold: 0
• options: Ship-to-home
• started: April 11, 2026
• quantity: 1
• best offers: True
• availability: In Stock

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

shipping cyclevintagee:

• cost: $7.57
• type: Calculated
• transit: 4-9 Days
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage

returns cyclevintagee:

• policy: No Returns

payments cyclevintagee:

• credit card: Visa
• other
• wallet: Apple-pay

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