POLARIS 5130611 Gearcase Rh

( Manufacturer Part Number: 5130611 ), ( Type: Gearcase, Rh )

Review POLARIS Oem Gearcase Rh fits TRAIL BOSS 250 1987

The **Polaris 5130611 1987 Trail Boss 250 Gearcase (RH)** is a meticulously crafted, high-performance transmission assembly designed exclusively for the iconic 1987 Polaris Trail Boss 250, a legendary off-road motorcycle known for its rugged durability and adventurous spirit. This gearcase represents the backbone of the Trail Boss s drivetrain, housing the precision-engineered gears, bearings, and seals that translate engine power into seamless, reliable torque for conquering rough terrain with confidence. Crafted from high-grade cast aluminum, the gearcase is built to withstand the demands of heavy-duty off-roading, featuring a robust right-hand (RH) orientation that aligns perfectly with the Trail Boss s original engine placement. The internal components include a hardened steel mainshaft and countershaft, precision-machined to minimize friction and maximize efficiency, ensuring smooth shifting and extended longevity even under the most grueling conditions. The gearcase also incorporates a robust oil seal system to prevent leaks and maintain optimal lubrication, safeguarding the internal mechanisms from dust, debris, and the elements. Whether restoring a classic Trail Boss to its former glory or upgrading an existing bike for enhanced performance, this gearcase is a critical component that embodies the reliability and heritage of Polaris engineering. Its compatibility with the 1987 model ensures a perfect fit, allowing riders to experience the unmatched freedom and power of this legendary off-road machine.

The Polaris 5130611 from 1987, specifically the Trail Boss 250 with a gearcase (part number 1987 Trail Boss 250), is a classic ATV that has both advantages and disadvantages depending on your intended use, budget, and experience level. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Classic Design and Nostalgia**

The 1987 Trail Boss 250 is a well-known model from Polaris early years, prized by collectors and enthusiasts for its vintage appeal. If you appreciate the history of ATVs or enjoy restoring and maintaining older machinery, this bike offers a unique piece of automotive heritage.

2. **Simplicity and Reliability**

Older ATVs like this one are often simpler in design compared to modern models, which can make repairs and maintenance more straightforward for those with mechanical experience. The basic engine and drivetrain components are easier to source and replace than parts from newer, more complex machines.

3. **Lower Purchase Price**

Due to its age, this ATV is significantly cheaper to buy than a new or even a used modern ATV. For buyers on a tight budget, this represents a great opportunity to own an ATV without the high cost of newer models.

4. **Off-Road Capability**

The Trail Boss 250 was designed for off-road use, featuring a sturdy frame, basic suspension, and a durable engine. While not as advanced as modern ATVs, it can handle light to moderate trails, rocky terrain, and rough conditions, making it suitable for recreational riding or light utility work.

5. **Ease of Modification**

For those interested in customization, older ATVs like this one offer a blank canvas. You can easily upgrade components such as the engine, suspension, tires, or exhaust to improve performance or comfort. Many aftermarket parts are still available for classic Polaris models.

6. **Lower Operating Costs**

Fuel efficiency on older ATVs like this one is generally better than on modern, high-performance models. Additionally, maintenance costs are lower because parts are cheaper and less complex to replace.

7. **Community and Support**

There is a dedicated community of owners, restorers, and enthusiasts for classic Polaris ATVs. Online forums, clubs, and local meetups provide access to shared knowledge, parts, and support for troubleshooting issues.

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### **Cons**

1. **Age and Wear**

The ATV is nearly 40 years old, which means it may have significant wear and tear. Rust, degraded rubber components (such as hoses, belts, and seals), and general deterioration are common issues. A thorough inspection and potential restoration work may be required before it is safe or reliable to ride.

2. **Outdated Safety Features**

Modern ATVs come with advanced safety features such as roll cages, improved braking systems, and better suspension designs. The 1987 Trail Boss 250 lacks many of these, making it less safe for aggressive riding or high-speed off-roading. Riders must exercise extreme caution to avoid accidents.

3. **Limited Availability of Parts**

While some parts are still available, many components for this model may be hard to find or require sourcing from specialty suppliers or collectors. This can increase the cost and time required for repairs or maintenance.

4. **Poor Fuel Efficiency Compared to Modern Standards**

The 250cc engine is not as fuel-efficient as modern ATV engines, especially when compared to newer, more advanced models. You may find yourself refueling more frequently, depending on the intensity and duration of your rides.

5. **Reliability Issues**

Older engines, especially two-stroke engines (common in early Polaris ATVs), are prone to wear and may require frequent maintenance. Issues such as oil leaks, piston wear, and carburetor problems are common and can lead to breakdowns if not addressed promptly.

6. **Inferior Suspension and Comfort**

The suspension on this model is basic and not designed for long hours of riding. Modern ATVs offer superior comfort, better shock absorption, and adjustable settings, which can make a significant difference during extended off-road trips.

7. **Environmental Concerns**

Two-stroke engines, which were common in older ATVs, are less environmentally friendly due to their higher emissions and lack of catalytic converters. If you are concerned about environmental impact, this may be a drawback.

8. **Resale Value**

Classic ATVs can appreciate in value if well-maintained, but they also depreciate rapidly if neglected. The resale market for this specific model is limited, and finding buyers may be difficult unless it is in excellent condition or restored.

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### **Conclusion**

The 1987 Polaris Trail Boss 250 with a gearcase is a fascinating piece of off-road history that offers a unique riding experience. It is well-suited for collectors, restorers, or enthusiasts who enjoy the challenge of maintaining and customizing an older ATV. For those who prioritize reliability, safety, and modern performance, this model may not be the best choice due to its age and lack of advanced features.

If you are considering purchasing this ATV, it is crucial to conduct a thorough inspection or have it professionally evaluated. Ensure that the engine, drivetrain, suspension, and frame are in good working condition, and be prepared for potential restoration work. Additionally, consider whether you are buying it for recreational riding, restoration, or as a project vehicle.

---

### **Recommendation**

- You are an experienced rider or mechanic comfortable with older machinery.

- You enjoy restoring or customizing classic ATVs and are willing to invest time and effort into bringing it back to working condition.

- You are on a tight budget and are looking for an affordable ATV for light off-road use or as a project vehicle.

- You appreciate the nostalgia and history of vintage ATVs and are not concerned about modern safety or performance features.

- You are looking for a reliable, ready-to-ride ATV for frequent use without significant maintenance.

- You prioritize safety and modern features such as roll cages, advanced suspension, or fuel efficiency.

- You are not prepared for the potential costs and challenges of restoring or maintaining an older ATV.

- You plan to use it for heavy-duty work or aggressive off-roading, where modern ATVs offer superior performance and safety.

For most casual riders or those seeking a practical ATV, a well-maintained used or new modern model would likely be a better investment. However, if you are passionate about classic ATVs and willing to put in the work, the 1987 Polaris Trail Boss 250 can be a rewarding and enjoyable project.

Details:

All parts are carefully packaged. See photos for exact condition.

part #: 5130611 prices

• $42.99-$150.00

specifications cyclevintagee:

• for models: 250, Trail, Boss
• for makes: Polaris
• for years: 1987
• mpn: 5130611
• type: Gearcase, Rh

shipping cyclevintagee:

• class: Standard
• transit: 3-9 Days
• cost: $0.00
• service: Standard
• type: Fixed

offer cyclevintagee:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: March 18, 2026
• quantity: 1

general cyclevintagee:

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

returns cyclevintagee:

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

payments cyclevintagee:

• wallet: Google-pay
• other
• credit card: Discover

seller cyclevintagee:

• city: Granton, Wisconsin
• # reviews: 1659
• rating: 99.9%

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