YAMAHA Piston Kit .50MM 39W-11630-21-00

( Manufacturer Part Number: 39W-11630-21 ), ( Part Type: Piston ), ( Country Of Origin: United States ), ( Manufacturer Warranty: 30 Day ), ( Storage Location: D5 Cha-n Buk 5 )

Review YAMAHA .50mm Os Piston Kit fits YZ125 1983–1984

The Yamaha YZ125 50mm Piston Kit 39w-11630-21-00 is an essential upgrade for any Yamaha YZ125 motorcycle model from 1983 to 1984. This piston kit is specifically designed to enhance the performance and durability of your two-stroke engine.

The piston itself is made of forged aluminum, ensuring superior strength and reliability. Its diameter measures exactly 50mm, which is a common size for high-performance pistons. The piston crown is engineered with a dish shape, providing excellent compression and power transfer.

The piston kit also includes a new ring set. The compression ring is made of chrome nitride, ensuring maximum sealing performance and longevity. The oil control ring is designed to minimize oil consumption and prevent blowby. The skirt rings are made of low-friction material, reducing friction and promoting efficient power transfer.

The piston kit is precision-machined to ensure a perfect fit in your engine. The piston pin is also included, which is made of high-strength steel and features a full floating design for added durability and reliability.

Installation of the piston kit is a straightforward process, but it is recommended that the work be performed by a professional mechanic. The kit includes all necessary hardware, including piston pin retaining clips and rings.

By upgrading to this Yamaha YZ125 50mm Piston Kit 39w-11630-21-00, you can expect improved engine performance, increased power, and enhanced durability. This kit is a must-have for any serious Yamaha YZ125 enthusiast looking to get the most out of their motorcycle.

Pros and Cons of Buying Yamaha YZ125 50mm Piston Kit (39w-11630-21)

The Yamaha YZ125 50mm Piston Kit (39w-11630-21) is designed to enhance the performance of the Yamaha YZ125 motorcycle. This kit is a popular aftermarket upgrade for those seeking improved power and torque. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this piston kit.

1. Increased Power and Torque: The primary benefit of installing a larger piston is the increase in power and torque. This can lead to better acceleration and overall performance improvements.

2. Improved Engine Response: A larger piston allows for a higher compression ratio, which can result in smoother engine response and improved throttle response.

3. Durability: The piston kit is made from high-quality materials, ensuring durability and long-lasting performance.

4. Customization: Installing a larger piston kit can be an appealing option for those seeking to personalize their motorcycle and differentiate it from stock models.

1. Complexity: Installing the piston kit requires significant mechanical knowledge and skill, making it a more complex upgrade compared to simpler modifications.

2. Cost: The piston kit can be quite expensive, and the installation process may require additional expenses for tools and labor.

3. Risk: Upgrading the piston can result in increased engine stress, which may lead to potential engine damage if not installed or maintained properly.

4. Compatibility: The piston kit may not be compatible with all YZ125 models, so it is essential to ensure that it is suitable for your specific motorcycle before making a purchase.

The Yamaha YZ125 50mm Piston Kit (39w-11630-21) offers several benefits, including increased power and torque, improved engine response, and durability. However, it also comes with potential disadvantages such as complexity, cost, risk, and compatibility issues. Ultimately, the decision to purchase this piston kit depends on your mechanical skills, budget, and desired performance improvements.

If you are an experienced motorcycle mechanic with a solid understanding of engine upgrades and are looking for significant power and torque improvements, the Yamaha YZ125 50mm Piston Kit (39w-11630-21) could be an excellent option for you. However, if you lack the mechanical expertise or are not prepared for the potential risks and costs, it might be wiser to consider alternative performance upgrades.

Details:

The image to watch on YouTube. This OEM component ensures optimal compression and longevity for your YZ125. Spotlight: A Day Inside . A genuine Yamaha.

Fits: 1983 Yamaha YZ125.

part #: 39w1163021 prices

• $85.47-$185.50

specifications pistondon:

• for models: Yz125
• for makes: Yamaha
• for years: 1983-1984
• mpn: 39w-11630-21
• part type: Piston
• country of origin: United States
• manufacturer warranty: 30 Day
• storage location: D5 Cha-n Buk 5

seller pistondon:

• rating: 99.3%
• # reviews: 206085
• city: Odessa, Florida

returns pistondon:

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

offer pistondon:

• started: January 20, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

shipping pistondon:

• service: FedEx Ground / FedEx Home Delivery, USPS Priority Mail, FedEx 2Day, Overnight
• cost: $0.00
• type: Fixed
• carrier: FedEx, USPS
• class: Standard, Expedited, One-day
• transit: 3-7 Days

payments pistondon:

• other
• wallet: Paypal
• credit card: Visa

general pistondon:

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

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