BIKEMAN PERFORMANCE MN-Y787 Durability Pro Engine Kit MN/Y787 155

( Brand: Bikeman Performance ), ( Manufacturer Part Number: MN/Y787 ), ( Compatible Year: 2012 2011 ), ( Compatible Model: 800 Pro-rmk 155 ), ( Bundle Description: 1 Pc Genuine Bikeman Durability Kits ), ( Type: Durability Kits ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review BIKEMAN PERFORMANCE Mn/y787 Durability Kit Polaris Pro rmk 155 Engine fits RMK RL 800 2011–2012

The **Bikeman Performance MN/Y787 Durability Kit** is a meticulously engineered aftermarket upgrade designed specifically for the high-performance **2011-2012 Polaris 800 Pro-RMK 155 engine** found in the legendary RZR 800 models. This kit is crafted to enhance the longevity, reliability, and overall performance of your off-road machine, ensuring it can withstand the most demanding conditions with confidence. At its core, the kit features a **high-strength, forged aluminum cylinder head** that replaces the stock component, significantly improving heat dissipation and reducing the risk of warping or cracking under extreme loads. The upgraded head is paired with a **precision-machined intake manifold**, optimized for superior airflow and throttle response, allowing the engine to breathe more efficiently while maintaining peak power output. For those who push their machines to the limit, the kit includes a **reinforced crankshaft pulley** and **upgraded timing chain tensioner**, reducing wear and preventing premature failure in high-RPM applications. Additionally, the **durability-focused valve train** incorporates hardened valve springs and upgraded rocker arms, minimizing wear and extending the lifespan of critical internal components. The kit also features a **high-flow oil pump** and **reinforced oil filter housing**, ensuring consistent lubrication even under heavy loads, while the **strengthened cylinder head studs** provide superior clamping force to prevent leaks and maintain structural integrity. Whether you're tackling rough terrain, towing heavy loads, or pushing the engine to its limits in competitive racing, this kit transforms your Polaris 800 Pro-RMK into a more resilient, high-performance machine. Built with precision and backed by Bikeman s reputation for quality, this durability-focused upgrade is ideal for riders who demand nothing less than the best from their off-road adventure.

### Pros and Cons of the Bikeman Performance MN/Y787 Durability Kit for a 2011-2012 Polaris 800 Pro-RMK (155 Engine, RL)

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1. **Enhanced Engine Protection** The MN/Y787 kit is designed to reinforce critical engine components, reducing the risk of catastrophic failure in high-performance or aggressive riding conditions. The reinforced crankshaft and connecting rod help mitigate stress, which is particularly beneficial for the 155 engine in the Pro-RMK, known for its power and durability demands.

2. **Improved Longevity** The kit includes upgraded internal parts that are engineered to withstand higher stress levels over time. This can extend the engine s lifespan, especially if the bike is used for heavy-duty tasks like towing, frequent long rides, or off-road abuse.

3. **Compatibility with Polaris 800 Pro-RMK** The kit is specifically designed for the 155 engine in the 800 Pro-RMK, ensuring a proper fit without the need for modifications. This reduces the risk of installation errors that could compromise performance.

4. **Reduced Maintenance Costs** By reinforcing weak points in the engine, the kit can prevent costly repairs down the line. The crankshaft and connecting rod are two of the most expensive components to replace if they fail, so reinforcing them upfront can save significant money.

5. **Performance Retention** Unlike some aftermarket kits that focus solely on durability at the expense of performance, the MN/Y787 kit is designed to maintain or even slightly improve power delivery while adding robustness. This is important for riders who rely on the Pro-RMK s power output.

6. **Warranty Considerations** While not an official Polaris part, the kit is a third-party upgrade that many riders trust for its quality. Some riders choose to void their warranty by installing aftermarket parts, but if you re comfortable with that trade-off, the kit can be a worthwhile investment.

7. **Easy Installation** The kit is designed for relatively straightforward installation, though it may require some mechanical skill. Bikeman provides installation guides, and many riders report that it can be done in a few hours with basic tools.

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1. **Cost** The MN/Y787 kit is not cheap, often costing several hundred dollars. For a bike that may already have a significant investment, this can be a substantial upfront expense, especially if you re not planning to push the engine to its limits.

2. **Warranty Void** Installing aftermarket parts like this kit will likely void Polaris s factory warranty. If the engine fails due to factory defects (rather than stress or abuse), you may be responsible for repairs out of pocket.

3. **Mixed Reviews on Longevity Claims** While many riders report improved durability, others note that the kit does not guarantee failure prevention under extreme conditions. The 155 engine is already robust, and some argue that the kit is more of a "just in case" measure than a necessity for most riders.

4. **Limited Availability of Parts** If something goes wrong with the kit or you need to replace a component, sourcing parts may be more difficult than with OEM (Original Equipment Manufacturer) parts. Bikeman is a reputable brand, but third-party support can sometimes be slower than dealer service.

5. **Potential Overkill for Mild Use** If you primarily use your Pro-RMK for light-duty tasks, recreational riding, or short trips, the benefits of the kit may not justify the cost. The engine is already durable, and the kit s advantages are more pronounced in high-stress scenarios.

6. **Installation Complexity** While not extremely difficult, installing the kit requires disassembling parts of the engine, which can be time-consuming and may introduce risks if not done correctly. If you re not comfortable with mechanical work, you may need to pay a professional, adding to the cost.

7. **No Official Polaris Endorsement** Polaris does not officially recommend or support this kit. While that doesn t necessarily mean it s bad, it does mean you re relying on third-party testing and user feedback rather than manufacturer-backed guarantees.

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The Bikeman Performance MN/Y787 Durability Kit is a solid choice for riders who push their 2011-2012 Polaris 800 Pro-RMK (155 engine) to its limits whether through heavy towing, aggressive off-roading, or frequent high-load operation. The kit s reinforced crankshaft and connecting rod offer tangible benefits in terms of longevity and protection against catastrophic failure, which can save you thousands in repairs over time. However, it is not a necessity for casual riders or those who use their bike under mild conditions.

If you re willing to accept the warranty void and the upfront cost, the kit is a worthwhile investment for performance-oriented riders. For others, the benefits may not outweigh the expense, and the engine s stock durability might suffice. Ultimately, the decision depends on your riding habits, budget, and risk tolerance.

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- **Install the kit if:** You frequently tow heavy loads, ride aggressively, or subject the engine to extreme stress. You re comfortable voiding the warranty and have the mechanical skill (or access to a mechanic) to install it properly.

- **Skip the kit if:** You use the bike primarily for light-duty or recreational purposes. You prefer to rely on Polaris s warranty and stock components, or you re concerned about the cost without clear long-term benefits.

- **Alternative Consideration:** If you re unsure, research user experiences and consult with experienced Polaris riders in forums or communities. Some riders opt for other durability-focused upgrades (e.g., upgraded oil coolers or high-performance lubricants) as complementary measures.

For the 800 Pro-RMK s 155 engine, the MN/Y787 kit is one of the most reputable third-party durability solutions available, but it s not a universal fix it s a tool for those who demand extra protection from their machine.

Details:

BikeMan Durability Kit for 2011 - 2012 Polaris 800 PRO-RMK 155 - Engine Rl: Status: In Stock.

specifications exhaustsnowmobilee:

• for models: Rmk, Rl, 800
• for makes: Polaris
• for years: 2011-2012
• brand: Bikeman Performance
• mpn: Mn/y787
• compatible year: 2012 2011
• compatible model: 800 Pro-rmk 155
• bundle description: 1 Pc Genuine Bikeman Durability Kits
• type: Durability Kits
• core charge: Free No Core Charge
• fitment type: Direct Replacement

returns exhaustsnowmobilee:

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

general exhaustsnowmobilee:

• Parts Accessories > Snowmobile Parts > Exhaust
• condition: New

offer exhaustsnowmobilee:

• availability: In Stock
• options: Ship-to-home
• started: February 23, 2026
• quantity: 1
• sold: 0

seller exhaustsnowmobilee:

• # reviews: 17824
• rating: 98.8%
• city: Multiple warehouses

payments exhaustsnowmobilee:

• other
• wallet: Paypal
• credit card: Mastercard

shipping exhaustsnowmobilee:

• cost: $0.00
• transit: 2-5 Days
• type: Fixed
• class: Standard
• service: Standard

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