1. Pistons, Rings & Piston Kits Products
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  3. YAMAHA 401-11637-00-00

YAMAHA 401-11637-00-00 Piston O/s 0.75MM

fits model: Mx125a, Mx125b, Yz. make: Yamaha. year: 1973–1975.

401-11637-00-00 Yamaha New Oem 401-11637-00 Piston 3 O/s 0.75mm Yz Mx125a Mx125b 1973-1975

( Engine Type: 2-stroke ), ( Type: Piston ), ( Machine Type: Off-road Motorcycle ), ( Oe/oem Part Number: 401-11637-00 ), ( Items Included: Oem Piston ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 401116370000 )

Review YAMAHA New Oem 401-11637-00 Piston O/s 0.75mm fits MX125A MX125B YZ 1973–1975

Introducing the Yamaha 401-11637-00 piston for the YZ MX125A and MX125B motorcycles manufactured between 1973 and 1975. This high-quality piston is designed with precision and durability in mind, ensuring optimal engine performance.

The piston features a 0.75mm oversize diameter, which allows for increased power output and improved combustion efficiency. The piston skirt is designed with a full-skirted profile to minimize friction and provide superior ring sealing, reducing the likelihood of oil leaks and improving engine efficiency.

The piston is made from a forged aluminum alloy material, providing superior strength and durability. The material also helps to keep the weight of the piston to a minimum, reducing rotating mass and improving engine response.

The piston crown is designed with a flat top profile, which is ideal for high-compression, two-stroke engines. The crown also features a dish design, which helps to improve the scavenging process and enhance engine power.

The piston rings included with this kit are made from high-quality, heat-resistant material, ensuring they can withstand the extreme temperatures and pressures generated within the engine. The rings are also designed to provide a tight seal, reducing the likelihood of oil leaks and improving engine efficiency.

The piston is designed to work seamlessly with the other components of the YZ MX125A and MX125B engines, ensuring a hassle-free installation process. The piston also comes with all necessary hardware, including pins and clips, making it a complete kit for your motorcycle engine rebuild or upgrade project.

In summary, the Yamaha 401-11637-00 piston is a high-performance, durable upgrade for the YZ MX125A and MX125B motorcycles manufactured between 1973 and 1975. With oversized dimensions, forged aluminum alloy construction, and high-quality piston rings, this piston is sure to provide improved engine performance and reliability.

The Yamaha 401-11637-00 piston for YZ MX125A and MX125B motorcycles produced between 1973 and 1975 is a crucial part for maintaining the optimal performance of these classic bikes. Here are some pros and cons that may help you decide whether to purchase this piston.

Pros:

1. Authentic OEM part: This piston is an original equipment manufacturer (OEM) part, meaning it is designed, manufactured, and tested by Yamaha specifically for their MX125A and MX125B motorcycles. This ensures a perfect fit and reliable performance.

2. Enhanced engine durability: A new piston can help extend the life of the engine by reducing wear and tear. This can be especially important if the current piston shows signs of damage or has exceeded its recommended lifespan.

3. Improved engine performance: A new piston can help restore the original performance of the engine. Worn pistons can lead to power loss, reduced efficiency, and poor fuel economy.

4. Peace of mind: By using a genuine OEM part, you can have confidence that the part is of high quality and will perform as intended. This can be especially important when working on a valuable or sentimental motorcycle.

Cons:

1. Cost: OEM parts, such as this Yamaha piston, can be more expensive than aftermarket alternatives. However, the increased cost may be worth it for the peace of mind and performance benefits that come with using a genuine OEM part.

2. Availability: Depending on the specific model and year of the motorcycle, it may be more challenging to find an OEM piston compared to aftermarket alternatives.

3. Installation: Installing a new piston can be a complex and time-consuming process. It may require specialized tools and knowledge, and it is important to ensure that the installation is done correctly to avoid any potential issues.

In conclusion, the decision to purchase the Yamaha 401-11637-00 piston for a YZ MX125A or MX125B motorcycle ultimately depends on your individual circumstances and priorities. If you value the peace of mind and performance benefits that come with using a genuine OEM part, and if you have the necessary resources to install it correctly, then this piston may be the best choice for you. However, if cost or availability are major concerns, you may want to consider aftermarket alternatives. Ultimately, the most important factor is ensuring that your motorcycle remains safe, reliable, and performing at its best.

Details:

It includes an oversized piston with a 0.75mm oversize for added performance and durability. This high-quality piston is an essential component for maintaining and repairing the engine of these classic motorcycles. Made in Japan, this vintage part is a genuine Yamaha product with the manufacturer number 401-11637-00. This product is a new OEM Yamaha piston designed for off-road motorcycles, specifically the YZ MX125A and MX125B model's from 1973 to 1975.

part #: 401116370000 prices

  • $22.95-$24.99

specifications pistondon:

  • for models: Mx125a, Mx125b, Yz
  • for makes: Yamaha
  • for years: 1973-1975
  • engine type: 2-stroke
  • type: Piston
  • machine type: Off-road Motorcycle
  • oe/oem part number: 401-11637-00
  • items included: Oem Piston
  • vintage part: Yes
  • country of origin: Japan
  • upc: 401116370000

shipping pistondon:

  • transit: 5-11 Days
  • carrier: USPS
  • cost: $0.00
  • type: Calculated
  • class: Standard
  • service: USPS Ground Advantage

returns pistondon:

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seller pistondon:

  • # reviews: 2242
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offer pistondon:

  • options: Ship-to-home
  • started: April 24, 2026
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  • availability: In Stock
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general pistondon:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
for models: mx125a, mx125b, yz, for makes: yamaha, for years: 1973-1975, engine type: 2-stroke, type: piston, machine type: off-road motorcycle, oe/oem part number: 401-11637-00, items included: oem piston, vintage part: yes, country of origin: japan,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 12007129919513722,

Yamaha 401-11637-00-00 Is Similar To:

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5 offers $22.95–$24.99 USD
  • Offer #1: $24.99 price + $8.75 shipping estimate = $33.74* total.+$8.75 shipping
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  • Offer #5: $25.00 price + $0.00 shipping estimate = $25.00* total. This high-quality piston is an essential component for maintaining and repairing the engine of these classic motorcycles. It includes an oversized piston with a +0.75mm oversize for added performance and durability.FREE SHIPPING

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