YAMAHA 134-11635-01-00 Piston Overbore .25MM YL1

( Part Type: Piston ), ( Material: Aluminum Alloy ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 134116350100 )

Review YAMAHA New Oem Piston 1st Overbore .25mm Fits Yl1 fits 1966-67

The Yamaha YL-1 134-11635-01-00 Piston Overbore is a replacement part designed for Yamaha YL-1 saxophones manufactured between 1966 and 1967. This piston overbore features a 25mm (1 inch) diameter, making it an ideal fit for those in need of a larger piston size for improved response and tone.

Crafted from premium materials, this piston overbore boasts a durable construction that can withstand the rigors of regular use. The piston is made from a high-quality brass alloy, providing excellent strength and resistance to corrosion. The sealing surface is made from a synthetic material, ensuring a consistent and airtight seal for optimal sound production.

The overbore design of this piston enhances the saxophone's intonation and response, allowing for superior articulation and projection. The larger diameter also provides increased airflow, resulting in a richer and fuller sound.

Installation of this piston overbore is straightforward and can be completed by a skilled saxophone technician or an experienced player. It is important to note that the use of aftermarket parts may require additional adjustments to ensure proper function and alignment.

In conclusion, the Yamaha YL-1 134-11635-01-00 Piston Overbore is a high-quality replacement part that can significantly enhance the performance of a Yamaha YL-1 saxophone manufactured between 1966 and 1967. Its durable construction, larger diameter, and overbore design make it an excellent choice for players seeking improved response, tone, and intonation.

The Yamaha YL-1 motorcycle, produced between 1966 and 1967, is a classic two-stroke engine that can be enhanced through piston overbore kits like the Yamaha part number 134-11635-01-00. Here are some potential pros and cons of buying this piston overbore kit for your YL-1 motorcycle.

1. Increased engine displacement: The 25mm piston overbore kit increases the engine's displacement from 125cc to approximately 142cc. This results in increased power output, improved torque, and potentially better performance.

2. Enhanced top-end power: The larger piston diameter allows for more fuel-air mixture to be compressed during each stroke, resulting in increased combustion efficiency and more power at higher RPMs.

3. Improved engine breathing: The larger piston also increases the engine's stroke length, which can lead to improved engine breathing and better power delivery throughout the rev range.

1. Complex installation: Installing a piston overbore kit can be a complex and time-consuming process. It requires disassembling the engine, machining the cylinder, and installing new piston rings and other components.

2. Potential compatibility issues: It's essential to ensure that the piston overbore kit is compatible with your specific YL-1 motorcycle model and year. Incorrectly sized or mismatched components can result in engine damage or poor performance.

3. Increased fuel consumption: Due to the increased engine size and power output, the motorcycle may consume more fuel than before, leading to higher operating costs.

4. Potential emissions issues: Two-stroke engines like the YL-1 produce more emissions than modern four-stroke engines. Installing a piston overbore kit may increase emissions, which could be a concern for environmental reasons or if you live in an area with strict emissions regulations.

In conclusion, the Yamaha 134-11635-01-00 piston overbore kit for the YL-1 motorcycle can provide increased power, improved engine breathing, and potentially better performance. However, the complex installation process, potential compatibility issues, increased fuel consumption, and potential emissions concerns should be carefully considered before making a purchase.

If you are an experienced motorcycle mechanic or enthusiast with a good understanding of two-stroke engines and the Yamaha YL-1 model, and you are looking for improved performance, then a piston overbore kit like the Yamaha 134-11635-01-00 could be a worthwhile investment. However, if you are new to motorcycle maintenance or unsure about the installation process, it may be better to consult with a professional mechanic or seek out alternative performance modifications that are less complex. Additionally, consider the cost of increased fuel consumption and potential emissions concerns before deciding to purchase.

Details:

New OEM Yamaha Piston 134-11635-01-00 1st overbore .25mm fits 1966-67 YL1. Prior numbers 134-11631-11-00 and 134-11631-10-00.

part #: 134116350100 prices

• $18.36-$20.00

specifications pistondon:

• for makes: Yamaha
• for years: 1966-67
• part type: Piston
• material: Aluminum Alloy
• vintage part: Yes
• country of origin: Japan
• upc: 134116350100

seller pistondon:

• rating: 100.0%
• city: Troy, New York
• # reviews: 354

payments pistondon:

• other
• credit card: Discover
• wallet: Apple-pay

shipping pistondon:

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

offer pistondon:

• availability: In Stock
• sold: 0
• best offers: True
• options: Ship-to-home
• started: March 16, 2026
• quantity: 1

returns pistondon:

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

general pistondon:

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

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