1. Pistons, Rings & Piston Kits Products
  2. sku: 11432458062862722
  3. YAMAHA 56A-11635-00

YAMAHA Piston Nos 56A-11635-00-00 0.25 O/s WM14B

fits model: Yz250, 250. make: Yamaha. year: 1985-87.

56a-11635-00 Yamaha 1985-87 Yz250 250 0.25 1st O/s Piston Nos Oem Wm14b

( Manufacturer Part Number: 56A-11635-00 ), ( Engine Type: 2-stroke ), ( Type: Piston ), ( Ipn: 56a-11635-00-00 ), ( Machine Type: Dual Sport Motorcycle, Off-road Motorcycle ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( Performance Part: No ), ( California Prop 65 Warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov )

Review YAMAHA 1985 87 0.25 1st O/s Piston Nos Oem fits YZ250 250 1985-87

The Yamaha YZ250 0.25 o/s piston kit, part number WM14B, is a high-performance upgrade for the 1985-1987 Yamaha YZ250 motorcycles. This piston kit is designed to deliver enhanced power and torque, making it an ideal choice for riders seeking improved engine performance.

The piston kit comprises of two fully balanced, forged 0.25 oversized pistons. The oversized design allows for increased combustion chamber volume, resulting in more power output. Each piston is precision machined to ensure a perfect fit in the engine cylinder and features a skirt diameter of 88.5mm and a piston pin diameter of 18mm.

The piston crowns are designed with a dish shape and a compression height of 31.2mm, which optimizes the combustion process and improves fuel efficiency. The piston rings included in the kit are made of high-quality materials that ensure a proper seal against the cylinder wall, preventing fuel and oil leaks.

The piston kit also includes a set of piston pins, piston pin retaining clips, and piston pin bushings to ensure a seamless installation process. The piston pins are made of high-strength material and are precision machined to fit perfectly in the piston. The retaining clips and bushings ensure a secure fit and prevent any unwanted movement of the piston pin.

The WM14B piston kit is a direct replacement for the OEM pistons and requires no modifications to the engine. It is designed to fit perfectly in the stock engine and can be installed using standard tools and techniques. The piston kit comes with detailed installation instructions to make the process as easy as possible for the rider.

In summary, the Yamaha YZ250 0.25 o/s piston kit, part number WM14B, is a top-quality upgrade for the 1985-1987 Yamaha YZ250 motorcycles. It delivers enhanced power and torque, making it an ideal choice for riders seeking improved engine performance. The kit includes two fully balanced, forged pistons, piston pins, piston pin bushings, and piston pin retaining clips, making it a complete solution for piston replacement.

Pros and Cons of Buying Yamaha 56A-11635-00 (1985-87 YZ250 250cc O/S Piston Nos WM14B)

Introduction:

The Yamaha 56A-11635-00 is a set of over-sized pistons (OS pistons) for the 1985-87 YZ250 motorcycle. These pistons come as a pair (WM14B) and are designed to increase the engine's displacement and power output. In this analysis, we will discuss the potential advantages and disadvantages of purchasing these pistons.

Pros:

1. Increased Power: Installing OS pistons like the Yamaha 56A-11635-00 can result in a noticeable increase in power output. This can lead to improved performance and a more enjoyable riding experience.

2. Better Torque: The larger piston size can help produce more torque, making the engine more responsive and easier to ride in various conditions.

3. Customization: For those who enjoy tinkering with their motorcycles, installing these pistons is a great way to customize their ride and potentially extract more performance.

Cons:

1. Higher Cost: OS pistons, such as the Yamaha 56A-11635-00, tend to be more expensive compared to stock pistons. This could be a deterrent for some buyers.

2. Increased Maintenance: Installing these pistons may require additional maintenance, as they might experience more wear and tear compared to stock pistons. This could lead to more frequent engine rebuilds or repairs.

3. Potential Compatibility Issues: Ensure that the pistons are compatible with your specific YZ250 model and engine configuration before making a purchase.

Conclusion:

The Yamaha 56A-11635-00 (1985-87 YZ250 250cc O/S Piston Nos WM14B) offers the potential for increased power, better torque, and customization for those who are willing to invest in them. However, buyers should be aware of the higher cost, increased maintenance, and potential compatibility issues. Ultimately, the decision to purchase these pistons depends on one's personal preferences, budget, and riding style.

Recommendation:

If you are looking for improved performance, increased power output, and better torque, the Yamaha 56A-11635-00 OS pistons could be a great addition to your YZ250 motorcycle. However, carefully consider the potential costs, maintenance requirements, and compatibility issues before making a purchase. It's always a good idea to consult with a professional mechanic or trusted sources in the motorcycle community for advice and guidance.

Details:

Limited 1985 87 Yamaha YZ250 250 0.25 1st O/S Piston 56A-11635-00 NOS OEMWM14B OFFER New piston for a dirt bike. 1985 87 Yamaha YZ250 250 0.25 1st O/S Piston 56A-11635-00 NOS OEMWM14B Limited OFFER High Quality Best Offers Fast Shipping New piston for a dirt bike. Unit is in new condition. Fast Shipping Best Offers High Quality New piston for a Yamaha YZ250 dirt bike.

Large items may incur shipping costs.

part #: 56a1163500 prices

  • $69.95-$121.95

specifications pistondon:

  • for models: Yz250, 250
  • for makes: Yamaha
  • for years: 1985-87
  • mpn: 56a-11635-00
  • engine type: 2-stroke
  • type: Piston
  • ipn: 56a-11635-00-00
  • machine type: Dual Sport Motorcycle, Off-road Motorcycle
  • vintage part: Yes
  • country of origin: Japan
  • performance part: No
  • california prop 65 warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov

offer pistondon:

  • options: Ship-to-home
  • best offers: True
  • availability: In Stock
  • quantity: 1
  • started: March 26, 2026
  • sold: 0

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general pistondon:

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

returns pistondon:

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

seller pistondon:

  • # reviews: 7341
  • rating: 99.6%
  • city: Aurora, Nebraska

shipping pistondon:

  • class: Standard
  • carrier: USPS
  • transit: 5-9 Days
  • service: USPS First Class
  • cost: $6.00
  • type: Fixed
for models: yz250, 250, for makes: yamaha, for years: 1985-87, engine type: 2-stroke, type: piston, machine type: dual sport motorcycle, off-road motorcycle, vintage part: yes, country of origin: japan, performance part: no, california prop 65 warning: this product may expose you to chemicals which are known to the state of california to cause cancer and birth defects or other reproductive harm. for more information go to www.p65warnings.ca.gov,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 11432458062862722,

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