BALLS MN-06TT Crank Bearing Seal Engine Kit All MN/06TT

( Brand: Balls ), ( Manufacturer Part Number: MN/06TT ), ( Type: Crank Bearing And Seal Kit ), ( Bundle Description: 1 Pc Genuine All Balls Crank Bearing And Seal Kit ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review BALLS All Mn/06tt Crank Bearing And Seal Kit Yamaha Engine Dr fits MX250 1975

The **Balls MN/06TT Crank Bearing Seal Kit** is a meticulously engineered aftermarket solution designed specifically for the **1975 Yamaha MX250** engine, addressing one of the most critical wear points in high-performance and off-road applications the crankshaft seals and bearings. This premium kit replaces the factory OEM components with high-quality, precision-machined parts that not only restore but significantly enhance the durability and reliability of your engine s lower end. The **MN/06TT** designation indicates a tailored fit for the **MX250 s 6TT (6-speed, twin-tube) crankshaft configuration**, ensuring seamless integration with the stock crankcase and main bearings. Crafted from **heat-treated steel** and **sintered bronze**, the crankshaft bearings provide superior load-bearing capacity, reducing friction and minimizing the risk of premature failure especially under the demanding conditions of aggressive riding, heavy loads, or extended use. Complementing the bearings is a **high-performance oil seal kit**, featuring a **dual-lip rubber seal with a reinforced metal backing**, designed to maintain optimal oil retention while preventing leaks that can compromise engine longevity. The seal s precision-engineered design ensures a tight, consistent fit against the crankshaft s polished surface, reducing wear and extending the life of both the seal and the crank itself. Whether you re preparing your MX250 for competitive racing, long-distance trail riding, or simply restoring it to peak condition, this kit delivers the robustness and performance required to keep your engine running smoothly for thousands of miles. Ideal for mechanics and riders who demand nothing less than the best, the **Balls MN/06TT Crank Bearing Seal Kit** is a straightforward yet transformative upgrade that bridges the gap between stock reliability and professional-grade performance.

The **Balls MN/06TT Crank Bearing Seal Kit** is a popular aftermarket option for upgrading the crankshaft bearings and seals on a 1975 Yamaha MX250 engine. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Balls MN/06TT Crank Bearing Seal Kit**

1. **Improved Durability and Longevity**

The kit replaces the stock crankshaft bearings and seals with higher-quality aftermarket parts. The bearings are often made from more robust materials (such as high-grade steel or bronze with better lubrication properties), reducing wear and extending the engine s lifespan. The seals are also designed to last longer than OEM components, reducing oil leaks and contamination.

2. **Better Performance and Smoothness**

Upgraded bearings can reduce friction, allowing the crankshaft to rotate more smoothly. This can lead to improved engine responsiveness, especially in high-RPM situations, and may help maintain power output over time. Some riders report a noticeable reduction in engine noise and vibration after installation.

3. **Oil Leak Prevention**

The stock seals on older Yamaha MX250 engines are prone to drying out and cracking, leading to oil leaks. The MN/06TT seals are typically made from more resilient materials (such as nitrile or EPDM rubber with reinforced edges) and are designed to resist oil degradation better than OEM parts. This reduces the risk of leaks and keeps the engine cleaner.

4. **Compatibility and Fitment**

The Balls kit is specifically designed for the 1975 Yamaha MX250 engine, ensuring a precise fit. The bearings and seals are engineered to match the crankshaft journal sizes and housing dimensions, minimizing clearance issues that could cause premature wear or binding.

5. **Ease of Installation**

While the installation still requires mechanical skill, the Balls kit is designed to be straightforward for someone with basic engine repair experience. The parts are pre-packaged, and the instructions are generally clear. This makes it a more accessible upgrade compared to custom or DIY bearing solutions.

6. **Cost-Effective Upgrade**

Compared to a full engine rebuild or replacement, the cost of the Balls kit is relatively low. It provides a significant performance and reliability boost without requiring major modifications to the engine block or crankshaft.

7. **Support for High-Mileage or Abused Engines**

If your 1975 Yamaha MX250 has high mileage or has been ridden hard, the stock bearings and seals may already be worn out. Replacing them with the MN/06TT kit can restore the engine s health and prevent catastrophic failure (such as a seized crankshaft) during use.

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### **Cons of the Balls MN/06TT Crank Bearing Seal Kit**

1. **Not a Complete Engine Rebuild**

While the kit upgrades the bearings and seals, it does not address other potential issues in the engine, such as worn pistons, rods, or camshafts. If these components are also degraded, the kit alone may not fully restore the engine s performance or longevity. A full teardown and inspection are still recommended before installation.

2. **Requires Disassembly and Skill**

Installing the kit requires removing the engine from the bike, stripping it down to the crankshaft, and carefully replacing the bearings and seals. This process is labor-intensive and time-consuming, especially for someone without prior engine repair experience. Mistakes during installation (such as improper bearing alignment or seal compression) can lead to premature failure or damage.

3. **Potential for Over-Tightening**

The crankshaft bearings must be installed with precise torque specifications to avoid binding or excessive play. Over-tightening can cause the bearings to seize, while under-tightening can lead to slop and accelerated wear. This requires careful attention to the installation instructions and the use of proper tools (such as a torque wrench).

4. **Limited Warranty or Support**

Aftermarket kits like the Balls MN/06TT typically come with limited warranties (if any), and customer support may not be as robust as OEM parts. If issues arise post-installation, resolving them may require troubleshooting on your own or seeking help from a mechanic.

5. **Compatibility with Modified Engines**

If you have modified your engine (e.g., with a different crankshaft, connecting rods, or pistons), the Balls kit may not be fully compatible. The bearings and seals are optimized for the stock crankshaft dimensions, and mismatched components could lead to poor performance or failure.

6. **Ongoing Maintenance Requirements**

While the upgraded bearings and seals last longer than OEM parts, they still require proper maintenance. This includes regular oil changes with high-quality oil (such as semi-synthetic or full synthetic), as well as periodic inspections for wear or leaks. Neglecting maintenance can negate the benefits of the kit.

7. **Potential for Contamination**

During installation, debris or old bearing material can contaminate the new bearings or seals. This requires meticulous cleaning of all surfaces and components to avoid premature failure. Cutting corners here can lead to catastrophic engine damage.

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### **Conclusion**

The **Balls MN/06TT Crank Bearing Seal Kit** is a worthwhile upgrade for a 1975 Yamaha MX250 engine, particularly if the stock bearings and seals are worn or leaking. The kit offers significant improvements in durability, smoothness, and oil leak prevention, making it a cost-effective way to extend the engine s life and enhance performance. However, it is not a standalone solution it should be paired with a thorough inspection of the rest of the engine components.

The installation process is challenging and requires mechanical skill, so it is best suited for riders with experience in engine repair or those willing to seek professional help. If your engine is in good condition otherwise, the kit can provide long-term benefits. If the engine has other major issues, addressing those first will ensure the most reliable results.

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### **Recommendation**

1. **Inspect the Engine Thoroughly**

Before purchasing the kit, disassemble the engine and inspect the crankshaft, connecting rods, pistons, and camshaft for wear. Replace any components that show significant damage or excessive wear. This ensures the kit s benefits are maximized and prevents future issues.

2. **Invest in Quality Tools**

Use proper tools such as a torque wrench, bearing installer, and clean workspace to ensure precise installation. Avoid shortcuts that could compromise the bearings or seals.

3. **Follow Installation Instructions Carefully**

Pay close attention to torque specifications, bearing alignment, and seal compression. Refer to the kit s manual and, if possible, consult a mechanic or experienced rider for guidance.

4. **Use High-Quality Oil**

After installation, use a high-quality oil (such as 10W-40 semi-synthetic or full synthetic) and follow the manufacturer s recommended oil change intervals. Proper lubrication is critical for the longevity of the new bearings.

5. **Monitor Performance Post-Installation**

After reassembling the bike, monitor the engine for unusual noises, vibrations, or oil leaks. If any issues arise, address them promptly to avoid further damage.

6. **Consider Professional Installation**

If you lack experience with engine repairs, consider having a trusted mechanic install the kit. While this adds to the cost, it can prevent costly mistakes and ensure the kit performs as intended.

**Final Verdict:** The Balls MN/06TT Crank Bearing Seal Kit is a strong upgrade for a 1975 Yamaha MX250, especially if the engine is showing signs of wear. It is a practical investment for riders looking to extend their engine s life and improve reliability. However, it should be part of a broader maintenance or rebuild plan rather than a standalone fix. For best results, combine it with a full engine inspection and proper installation techniques.

Details:

All Balls Crank Bearing and Seal Kit for 1975 Yamaha MX250 - Engine dr: Status: In Stock.

part #: mn06tt price

• $86.61

specifications bearingmotorcycleiz:

• for models: Mx250
• for makes: Yamaha
• for years: 1975
• brand: Balls
• mpn: Mn/06tt
• type: Crank Bearing And Seal Kit
• bundle description: 1 Pc Genuine All Balls Crank Bearing And Seal Kit
• core charge: Free No Core Charge
• fitment type: Direct Replacement

shipping bearingmotorcycleiz:

• cost: $0.00
• type: Fixed
• transit: 2-6 Days
• service: Standard
• class: Standard

offer bearingmotorcycleiz:

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

seller bearingmotorcycleiz:

• city: Multiple warehouses
• # reviews: 2002 7
• rating: 99.0%

returns bearingmotorcycleiz:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

payments bearingmotorcycleiz:

• other
• wallet: Paypal
• credit card: Visa

general bearingmotorcycleiz:

• condition: New
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Engine Bearings

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