POLARIS 642P8 Wiseco Piston Kit Bike 89-1995 89-1998 2MM

( Brand: Polaris ), ( Manufacturer Part Number: 642P8 ), ( Machine Type: Off-road Motorcycle ), ( Items Included: Piston Rings, Wrist Pin, Clips ), ( Piston Diameter: 68.94mm ), ( Material: Aluminum Alloy ), ( Vintage Part: No ), ( Engine Type: 2-stroke ), ( Type: Piston Kit ), ( Cylinder Bore Diameter: 69.00mm ), ( Pin Diameter: 18mm ), ( Country Of Origin: United States )

Review POLARIS Suzuki Dirt Bike 89-1995 89-1998 2mm Over Wiseco Piston Kit fits RM250 RMX250

Introducing the Wiseco 2mm Overbore Piston Kit for Polaris 642P8 Suzuki Bikes model years 1989-1995 (RM250) and 1989-1998 (RMX250). This high-performance piston kit is specifically designed to deliver increased power and torque, making it an excellent choice for riders seeking to enhance their riding experience.

The Wiseco piston kit includes two forged pistons with a 2mm overbore diameter, which allows for increased displacement and improved combustion efficiency. These pistons are manufactured using Wiseco's proprietary spinning process, ensuring superior strength and durability.

The pistons feature a low-friction, SKF ringset, which reduces friction and wear on the piston and cylinder walls, resulting in longer engine life and improved performance. The ringset includes a compression ring, oil control ring, and two piston rings.

Additionally, the pistons come with a set of Wiseco's high-performance, 100% forged, billet aluminum piston pins. These pins are precision machined and heat-treated for optimal strength and durability.

This Wiseco piston kit is a direct bolt-on replacement for the stock pistons, making installation easy and straightforward. However, we recommend having the cylinder bore honed before installing the new pistons to ensure a proper fit and optimal engine performance.

In summary, the Wiseco 2mm Overbore Piston Kit for Polaris 642P8 Suzuki Bikes is an excellent upgrade for riders seeking increased power, torque, and improved engine performance. With forged pistons, a high-performance ringset, and billet aluminum piston pins, this kit is built to last and deliver impressive results.

Pros and Cons of Buying a Wiseco Piston Kit for Polaris 642P, Suzuki RM250, and RMX250 (1989-1998)

* The Wiseco piston kit is designed to provide better compression, leading to increased engine performance.

* Improved power output and torque.

* Wiseco pistons are known for their superior quality and durability.

* The piston kit may last longer than the OEM pistons, reducing the frequency of replacements.

* The Wiseco piston kit offers the flexibility to customize your engine's performance by choosing the appropriate piston and ring combination.

* Depending on the specific piston and ring combination chosen, the power increase could be significant.

* The Wiseco piston kit may be more expensive than the OEM piston kit.

* The initial investment could be a deterrent for some riders.

* Installing a Wiseco piston kit may be more complicated than installing an OEM piston kit, requiring additional time and expertise.

* A piston kit upgrade might necessitate additional engine tuning to optimize the new components' performance.

The Wiseco piston kit for Polaris 642P, Suzuki RM250, and RMX250 (1989-1998) offers several advantages, including enhanced performance, durability, and customizability. However, it also comes with some drawbacks, such as a higher cost, installation complexity, and potential engine tuning needs. Ultimately, the decision to purchase the Wiseco piston kit depends on your budget, technical expertise, and desired riding experience.

If you are an experienced rider with a good understanding of engine mechanics, seeking maximum performance from your bike, and have the financial resources to invest in a high-quality piston kit, the Wiseco piston kit for your Polaris 642P, Suzuki RM250, or RMX250 (1989-1998) is a worthwhile investment. However, if you are a beginner or budget-conscious rider, it might be more practical to stick with the OEM piston kit.

Details:

This kit consists of piston, rings, pin and clips. This listing is for a NEW Wiseco brand 2mm oversize piston kit. Looked the part number up online and found that this will fit following machines, may others too, Suzuki RM250 1989 1995 RMX250 1989 1998 The on kit is 642P8 supersedes to 642M06900.

part #: 642p8 prices

• $149.99-$246.95

specifications pistondon:

• for models: Rm250, Rmx250
• for makes: Suzuki, Polaris
• brand: Polaris
• mpn: 642p8
• machine type: Off-road Motorcycle
• items included: Piston Rings, Wrist Pin, Clips
• piston diameter: 68.94mm
• material: Aluminum Alloy
• vintage part: No
• engine type: 2-stroke
• type: Piston Kit
• cylinder bore diameter: 69.00mm
• pin diameter: 18mm
• country of origin: United States

seller pistondon:

• city: Aitkin, Minnesota
• # reviews: 15629
• rating: 99.9%

offer pistondon:

• sold: 0
• availability: In Stock
• started: March 12, 2026
• options: Ship-to-home
• quantity: 1

payments pistondon:

• wallet: Paypal
• other
• credit card: Diners-club

shipping pistondon:

• type: Fixed
• class: Standard
• carrier: USPS
• cost: $0.00
• service: USPS Ground Advantage
• transit: 2-6 Days

general pistondon:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
• condition: New other see details

returns pistondon:

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

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