YAMAHA 1W5-11638-00-00 Piston Overbore 4TH 1.00MM

( Manufacturer Part Number: 1W5-11638-00-00 ), ( Part Type: Piston ), ( Material: Aluminum Alloy ), ( Vintage Part: Yes ), ( Country Of Origin: Japan )

Review YAMAHA New Oem Piston 4th Overbore 1.00mm fits IT250 1977-78

Yamaha IT250 1.0mm 4th Overbore Piston (1W5-11638-00-00)

The Yamaha IT250 1.0mm 4th Overbore Piston (Part Number: 1W5-11638-00-00) is a high-performance replacement component designed specifically for the Yamaha IT250 engine, manufactured between 1977 and 1978. This piston undergoes an advanced overboring process, expanding the piston diameter by 1.0mm to improve engine performance.

Crafted from a forged aluminum alloy material, this piston offers superior strength and durability. Its sleek design ensures a snug fit within the engine cylinder, while its precision-engineered dimensions ensure seamless compatibility with the engine's other components.

The 4th overbore piston is engineered to enhance the engine's power output by increasing the combustion chamber volume. This results in more efficient fuel burning and an increase in horsepower, making it an excellent choice for riders seeking a more responsive and powerful riding experience.

The piston features a compression height of approximately 31.5mm and a total height of around 54.5mm. The piston's ring grooves are designed to accommodate standard piston rings, ensuring a proper seal and optimal engine performance.

Installing this 4th overbore piston involves disassembling the engine, which may require the assistance of a professional mechanic. It is recommended to use a high-quality piston ring set and cylinder hone to ensure proper sealing and optimal engine performance.

By upgrading to this Yamaha IT250 1.0mm 4th Overbore Piston, riders can expect improved engine performance, increased power output, and a more responsive riding experience. This piston is an excellent investment for anyone looking to enhance the capabilities of their vintage Yamaha IT250 engine.

The Yamaha 1W5-11638-00-00 piston is a fourth overbore piston with a 1.00mm increase in size, specifically designed for use in IT250 engines manufactured between 1977 and 1978. This piston upgrade is aimed at enhancing engine performance by increasing compression and power output. Let's examine the potential pros and cons of installing this piston in your IT250 engine.

1. Increased power: The primary benefit of using a larger overbore piston is the potential for increased power output. The larger piston displaces more fuel and air into the combustion chamber, resulting in more power.

2. Improved combustion efficiency: The larger piston can lead to improved combustion efficiency due to the increased compression ratio. This can result in better fuel economy and reduced exhaust emissions.

3. Enhanced durability: A larger piston can help reduce engine wear and tear by allowing for a more efficient combustion process.

1. Cost: The cost of purchasing and installing a larger piston can be significant. Additionally, the installation process may require professional assistance, adding to the overall cost.

2. Potential for engine damage: Installing a larger piston can increase the risk of engine damage if not done correctly. Improper installation or use of the wrong piston for your engine can result in serious damage, potentially requiring expensive engine repairs or even a replacement.

3. Requires other modifications: Installing a larger piston may require other modifications to the engine, such as upgraded cylinder heads or camshafts, to ensure optimal performance and prevent damage.

The decision to install a Yamaha 1W5-11638-00-00 piston in your IT250 engine depends on your specific goals and budget. If you are looking for increased power and improved combustion efficiency, this piston upgrade could be a worthwhile investment. However, it is essential to consider the potential costs, risks, and necessary modifications before making a final decision. It's recommended to consult with a professional mechanic or engine specialist to determine if this upgrade is right for your engine and to ensure proper installation.

Details:

New OEM Yamaha Piston 1W5-11638-00-00 4th overbore 1.00mm 1977-78 IT250.

part #: 1w5116380000 prices

• $25.00-$34.99

specifications pistondon:

• for models: It250
• for makes: Yamaha
• for years: 1977-78
• mpn: 1w5-11638-00-00
• part type: Piston
• material: Aluminum Alloy
• vintage part: Yes
• country of origin: Japan

returns pistondon:

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

payments pistondon:

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

seller pistondon:

• rating: 100.0%
• # reviews: 348
• city: Troy, New York

shipping pistondon:

• transit: 3-8 Days
• type: Calculated
• carrier: FedEx
• class: Economy
• service: FedEx Ground Economy
• cost: $9.66

general pistondon:

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

offer pistondon:

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

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