YAMAHA 2J5-11638-00 Nos Piston 4TH O/s

( Manufacturer Part Number: 2J5-11638-00 ), ( Type: Piston ), ( Vintage Part: Yes ), ( Country Of Origin: Japan )

Review YAMAHA New Nos Genuine Part# Piston 4th O/s fits YZ80

Introducing the Yamaha 2J5-11638-00 NOS (New Old Stock) piston, specifically designed for the fourth oversize (4OS) cylinder of the legendary YZ80 two-stroke motorcycle. This high-performance piston is an excellent replacement or upgrade option for enthusiasts seeking to optimize the power and efficiency of their YZ80 engine.

The Yamaha 2J5-11638-00 NOS piston is meticulously crafted from a durable and lightweight alloy material. Its precise dimensions and superior quality ensure a perfect fit in the YZ80 engine cylinder, resulting in seamless integration and efficient combustion.

The piston's oversize design provides an increased engine displacement, which translates to more power and torque at your disposal. The 4OS piston is specifically engineered to accommodate larger bore sizes, enhancing the overall performance of your YZ80 motorcycle.

The Yamaha 2J5-11638-00 NOS piston boasts a state-of-the-art ring package, featuring a compression ring, oil control ring, and skirt oil scraper ring. These rings work together to optimize the engine's performance, reduce friction, and improve overall engine efficiency.

In addition to its high-performance capabilities, the Yamaha 2J5-11638-00 NOS piston is designed with durability in mind. Its robust construction ensures that it can withstand the rigors of high-performance riding, making it an ideal choice for racers and enthusiasts alike.

The Yamaha 2J5-11638-00 NOS piston is a genuine Yamaha product, ensuring that it meets the highest standards of quality and performance. It is a direct replacement for the original piston, providing a reliable and efficient solution for those looking to restore or upgrade their YZ80 motorcycle.

In summary, the Yamaha 2J5-11638-00 NOS piston is a top-tier replacement or upgrade option for the fourth oversize cylinder of the YZ80 motorcycle. Its oversize design, superior quality materials, advanced ring package, and durable construction make it an excellent investment for those seeking to maximize the power and efficiency of their YZ80.

Pros and Cons of Buying Yamaha 2J5-11638-00 NOS Piston for a YZ80

a. OEM Part: This piston is a genuine Yamaha part, ensuring a perfect fit and optimal engine performance.

b. Improved Performance: A new piston can lead to improved combustion efficiency and horsepower, enhancing the overall riding experience.

c. Longevity: A new piston can prolong the engine life, reducing the frequency of future replacement needs.

d. Consistency: When replacing multiple parts, using genuine OEM parts like this piston ensures consistent performance and reliability across all components.

a. Cost: OEM parts like this piston can be more expensive compared to aftermarket alternatives.

b. Availability: Depending on the supplier or distributor, it may take some time to source and receive the part.

When deciding to buy the Yamaha 2J5-11638-00 NOS Piston for a YZ80, consider the advantages of using an OEM part, such as improved performance, engine longevity, and consistency. However, be prepared for the potential downsides, such as higher cost and potential shipping delays. Ultimately, the decision to purchase this piston depends on your budget, availability, and preference for genuine Yamaha parts.

If you prioritize optimal engine performance, consistency, and longevity, and have the budget for it, the Yamaha 2J5-11638-00 NOS Piston is a solid choice for your YZ80. However, if you're looking for a more cost-effective option, consider exploring aftermarket alternatives while ensuring they meet the necessary specifications for your engine.

Details:

YZ80 COMPETITION 1979 USA. YZ80 COMPETITION 1977 USA. Fits the following Yamaha model's C132: Other that this item fits.

part #: 2j51163800 prices

• $49.00-$81.86

specifications pistondon:

• for models: Yz80
• for makes: Yamaha
• mpn: 2j5-11638-00
• type: Piston
• vintage part: Yes
• country of origin: Japan

shipping pistondon:

• carrier: USPS
• service: USPS Ground Advantage
• class: Standard
• transit: 6-12 Days
• type: Fixed
• cost: $5.65

offer pistondon:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 2
• started: February 13, 2026
• best offers: True

seller pistondon:

• city: Saugerties, New York
• rating: 99.6%
• # reviews: 919

returns pistondon:

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

general pistondon:

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

payments pistondon:

• credit card: Diners-club
• other
• wallet: Google-pay

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