YAMAHA 372-11636-09-00 Piston Overbore 137-11636-61-00 2ND .50MM YA6

( Part Type: Piston ), ( Material: Aluminum Alloy ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 137116366100 )

Review YAMAHA New Oem Piston Sub 2nd Overbore .50mm Ya6

Introducing the Yamaha YA6 50mm 2nd Overbore Piston Set, a high-performance upgrade for your Yamaha outboard motor. This piston set is specifically designed for Yamaha outboard engines with the part numbers 137-11636-61-00 (for the piston) and 372-11636-09-00 (for the 2nd overbore).

The 50mm bore size of this piston set is a significant upgrade, providing increased power and torque for your outboard motor. The piston is meticulously crafted using advanced materials and manufacturing techniques, ensuring superior durability and reliability. Its precision-machined surface guarantees a perfect fit with the engine cylinder, while its optimized combustion chamber design enhances fuel efficiency and power output.

The 2nd overbore component of this piston set is equally impressive, offering enhanced engine breathing and performance. Its design increases the engine's intake and exhaust flow rates, resulting in more power and improved throttle response. The overbore is made from the same high-quality materials as the piston, ensuring a perfect fit and long-lasting performance.

The Yamaha YA6 50mm 2nd Overbore Piston Set is an essential upgrade for any serious outboard motor enthusiast. It is specifically engineered to provide improved power, torque, and efficiency, making it an excellent investment for those seeking maximum performance from their Yamaha outboard engine.

This piston set comes with all necessary hardware and instructions for a straightforward installation process. It is also backed by Yamaha's reputation for quality and reliability, ensuring peace of mind and satisfaction with your purchase.

In summary, the Yamaha YA6 50mm 2nd Overbore Piston Set is an exceptional upgrade for Yamaha outboard engines, offering increased power, torque, and efficiency through its advanced design and high-quality materials. Its precision manufacturing and perfect fit ensure a seamless installation and long-lasting performance, making it a must-have for any serious outboard motor enthusiast.

Pros and Cons of Buying Yamaha Ya6 372cc, 2nd Overbore Piston Kit

The Yamaha Ya6 372cc, 2nd Overbore Piston Kit (137-11636-61-00 for piston and 137-11636-09-00 for piston ring) is a popular choice for those seeking to upgrade their Yamaha engines. In this analysis, we will discuss the potential advantages and disadvantages of investing in this piston kit.

1. Enhanced Performance: The primary reason for purchasing a 2nd overbore piston kit is to increase engine performance. The larger bore size results in increased displacement, leading to more power and torque.

2. Improved Engine Durability: A new piston kit can help extend the life of the engine. With new pistons and rings, you can avoid potential issues like ring groove wear, ring shrinkage, and piston skirt scuffing.

3. Reduced Engine Wear: By upgrading to a piston kit, you can minimize wear on the existing components. This is particularly important if you frequently use your engine at high RPMs or under heavy loads.

4. Customization: Installing a 2nd overbore piston kit can be an excellent way to personalize your engine. It can help you achieve a unique powerband or power level that suits your specific needs and preferences.

5. Potential Fuel Economy Improvements: While not a guarantee, some users report improved fuel economy after installing a 2nd overbore piston kit. This is due to the engine's increased efficiency and ability to utilize fuel more effectively.

1. Cost: The Yamaha Ya6 372cc, 2nd Overbore Piston Kit is a significant investment. The cost of the kit may be a deciding factor for some potential buyers.

2. Installation Complexity: Installing a 2nd overbore piston kit requires considerable expertise and resources. It is recommended to have the installation performed by a professional mechanic to ensure proper fitment and optimal performance.

3. Maintenance Requirements: A larger bore size and increased engine performance may require more frequent maintenance. This includes more frequent oil changes, coolant flushes, and valve adjustments.

4. Potential Powerband Shift: Depending on the specific engine application and tuning, the installation of a 2nd overbore piston kit may result in a noticeable powerband shift. This could require adjustments to the engine's fuel mapping or ignition timing to restore optimal power delivery.

In conclusion, the Yamaha Ya6 372cc, 2nd Overbore Piston Kit offers several advantages, including enhanced performance, improved engine durability, reduced engine wear, and customization opportunities. However, it also comes with some disadvantages, such as cost, installation complexity, increased maintenance requirements, and potential powerband shifts.

If you are an experienced engine builder or mechanic and are looking for a significant power increase, the Yamaha Ya6 372cc, 2nd Overbore Piston Kit may be a worthwhile investment. However, if you are a casual user or have limited experience working on engines, it is recommended to consider alternative performance upgrades or consult with a professional mechanic before making a decision. Ultimately, the decision to purchase this piston kit depends on your budget, engine application, and personal goals.

Details:

Prior number 137-11631-90-00 and 137-11631-91-00. New OEM Yamaha Piston 137-11636-61-00 supersedes to 372-11636-09-00 2nd overbore .50mm. Fits 1964-66 YA6.

part #: 137116366100 prices

• $17.10-$35.19

specifications pistondon:

• for makes: Yamaha
• part type: Piston
• material: Aluminum Alloy
• vintage part: Yes
• country of origin: Japan
• upc: 137116366100

payments pistondon:

• wallet: Google-pay
• credit card: Visa
• other

offer pistondon:

• availability: In Stock
• started: March 18, 2026
• sold: 0
• options: Ship-to-home
• best offers: True
• quantity: 1

seller pistondon:

• city: Troy, New York
• rating: 100.0%
• # reviews: 365

returns pistondon:

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

shipping pistondon:

• type: Calculated
• transit: 3-8 Days
• class: Economy
• service: FedEx Ground Economy
• carrier: FedEx
• cost: $8.62

general pistondon:

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

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