BALLS MN-AP0M Crank Bearing Seal Engine Kit All MN/AP0M

( Brand: Balls ), ( Manufacturer Part Number: MN/AP0M ), ( Type: Crank Bearing And Seal Kit ), ( Compatible Year: 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 ), ( Compatible Model: 125 Exc ), ( 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/ap0m Crank Bearing And Seal Kit Ktm Exc Engine fits ZX 125 1998–2007

The **Balls MN/AP0M Crank Bearing Seal Kit** is a meticulously engineered aftermarket solution designed specifically for the high-performance 1998 2007 KTM 125cc EXC and ZX engines, ensuring optimal sealing, durability, and reliability under demanding riding conditions. This premium kit replaces the stock crankshaft seals with high-quality, oil-resistant **AP0M (Amphenol Polyurethane Oil Seal)** components, which are renowned for their superior resistance to abrasion, temperature fluctuations, and chemical degradation critical factors for engines subjected to aggressive off-road use, frequent track sessions, or extreme climates. The seals feature a **metal-reinforced lip design**, providing enhanced structural integrity while maintaining a tight, consistent seal against the crankshaft s polished surface, minimizing oil leaks and contamination of the air filter or chaincase. Complementing the AP0M seals is a **Balls MN crank bearing kit**, which includes precision-machined **needle bearings** and **bronze-backed thrust washers** engineered to reduce friction, absorb shock, and extend the lifespan of the crankshaft and connecting rod bearings. Together, these components address common issues in KTM s smaller displacement engines, such as premature seal failure, crankshaft wear, and oil leakage, which can compromise performance and lead to costly internal damage. This kit is ideal for riders seeking a **direct-fit, no-compromise upgrade** that restores factory-like reliability while accommodating the stresses of modern riding whether on trails, in motocross arenas, or during high-speed enduro adventures. Installation is straightforward, requiring only basic tools, and the use of high-grade materials ensures long-term performance, making it a smart investment for both maintenance-minded enthusiasts and competitive riders prioritizing engine longevity.

Buying the **Balls MN/AP0M crank bearing seal kit** for a **1998 2007 KTM 125 Exc/ZX engine** can be a practical solution for maintaining or restoring your bike s crankshaft assembly. Below are the key pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Compatibility and Fitment**

The Balls MN/AP0M kit is specifically designed for the **KTM 125 Exc/ZX engine family**, ensuring a precise fit for the crankshaft bearings and seals. This reduces the risk of improper installation, which can lead to premature wear or failure.

2. **High-Quality Materials**

Balls Manufacturing is known for producing durable, high-performance bearings and seals. Their products are often made from hardened steel, high-grade bronze, or specialized polymers, which provide better load-bearing capacity and resistance to wear compared to generic or aftermarket alternatives.

3. **Reduced Friction and Improved Efficiency**

Well-lubricated and properly fitted bearings minimize friction in the crankshaft assembly, which can improve engine efficiency, reduce oil consumption, and lower the risk of overheating. This is particularly beneficial for bikes that see heavy use or are modified for performance.

4. **Prevents Oil Leaks**

The seal kit includes updated or replacement seals that prevent oil from leaking into the crankcase or onto the chain, keeping the engine clean and reducing maintenance hassle. This is especially useful for older bikes where seals may have degraded over time.

5. **Easier Maintenance**

The kit typically includes all necessary components (bearings, seals, sometimes even gaskets or shims) in one package, simplifying the rebuild process. This reduces the need to source parts separately, saving time and potential confusion during assembly.

6. **Cost-Effective for Long-Term Reliability**

While the upfront cost may be higher than some generic kits, investing in a reputable brand like Balls can extend the lifespan of your crankshaft assembly, avoiding costly engine damage from bearing failure or oil leaks.

7. **Backed by Industry Reputation**

Balls Manufacturing has a strong reputation in the motorcycle and ATV industry for reliability. Their products are often recommended by mechanics and enthusiasts for critical components like crankshaft bearings and seals.

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### **Cons**

1. **Higher Upfront Cost**

Compared to generic or budget aftermarket kits, the Balls MN/AP0M kit is more expensive. For riders on a tight budget, this may be a deterrent, especially if the bike is not heavily used or modified.

2. **Requires Professional Installation (Optional but Recommended)**

While the kit is designed for DIYers, improper installation such as incorrect bearing alignment, seal compression, or lubrication can lead to premature failure. If you lack experience with engine rebuilds, hiring a mechanic may add to the cost.

3. **Limited Availability**

Balls Manufacturing may not be as widely stocked as some mainstream aftermarket brands. You may need to order directly from their website, a specialty motorcycle parts dealer, or an online retailer, which could involve shipping delays.

4. **Potential Overkill for Light Use**

If your bike is ridden infrequently or under mild conditions, the benefits of a high-end bearing/seal kit may not be immediately noticeable. For such cases, a more budget-friendly option might suffice.

5. **Mixed Reviews on Longevity in Extreme Conditions**

While Balls products are generally durable, extreme conditions (e.g., heavy off-roading, extreme temperatures, or aggressive modifications) may still stress the components. Some users report that even high-quality bearings can wear out faster if the engine is not properly maintained (e.g., insufficient oil changes, poor lubrication).

6. **Compatibility with Modifications**

If your bike has been heavily modified (e.g., forced induction, custom crankshafts, or altered engine specs), you should verify whether the Balls kit is fully compatible. Some aftermarket parts may require custom bearings or seals.

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### **Conclusion**

The **Balls MN/AP0M crank bearing seal kit** is a strong choice for KTM 125 Exc/ZX owners who prioritize **durability, reliability, and long-term engine health**. Its precision engineering, high-quality materials, and compatibility with the stock engine make it ideal for riders who want to avoid common issues like oil leaks, bearing wear, or premature engine failure. However, the higher cost and potential need for professional installation may not justify the purchase for casual riders or those on a tight budget.

For **stock or lightly modified bikes**, the kit is a worthwhile investment if you plan to keep the bike for years. For **heavily modified or high-mileage engines**, it may be even more critical to prevent catastrophic failure. If cost is a concern, a reputable but slightly less expensive brand (e.g., **SKF, NTN, or a high-end aftermarket kit**) could be considered, though with slightly less assurance of longevity.

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### **Recommendation**

- You want the best available quality for your KTM 125 Exc/ZX crankshaft.

- You plan to keep the bike long-term or ride it frequently.

- You are comfortable with a DIY rebuild or have access to a skilled mechanic.

- Your bike is stock or has minor modifications.

- You are on a tight budget and the bike is lightly used.

- You prefer to test a more budget-friendly kit first (e.g., **SKF or NTN bearings with OEM seals**).

- Your bike has extensive modifications that may require custom parts.

Ultimately, the Balls kit is one of the most reliable options for this engine, and the investment is often justified by the reduction in long-term maintenance and engine failure risks. Always pair the purchase with proper lubrication (high-quality motor oil) and follow the manufacturer s installation guidelines.

Details:

All Balls Crank Bearing and Seal Kit for 1998 - 2007 KTM 125 EXC - Engine Zx: Status: In Stock.

part #: mnap0m price

• $136.83

specifications bearingmotorcycleiz:

• for models: Zx, 125
• for makes: Ktm
• for years: 1998-2007
• brand: Balls
• mpn: Mn/ap0m
• type: Crank Bearing And Seal Kit
• compatible year: 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998
• compatible model: 125 Exc
• bundle description: 1 Pc Genuine All Balls Crank Bearing And Seal Kit
• core charge: Free No Core Charge
• fitment type: Direct Replacement

offer bearingmotorcycleiz:

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

shipping bearingmotorcycleiz:

• service: Standard
• cost: $0.00
• type: Fixed
• class: Standard
• transit: 3-7 Days

returns bearingmotorcycleiz:

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

seller bearingmotorcycleiz:

• # reviews: 2001 9
• city: Multiple warehouses
• rating: 99.0%

payments bearingmotorcycleiz:

• other
• credit card: Mastercard
• wallet: Paypal

general bearingmotorcycleiz:

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

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