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  3. YAMAHA 1W6-11636-00-00

YAMAHA 1W6-11636-00-00 Piston Overbore 2ND .50MM

fits model: It400. make: Yamaha. year: 1977-78.

1w6-11636-00-00 Yamaha New Oem Piston 2nd Overbore .50mm 1977-78 It400

( Manufacturer Part Number: 1W6-11636-00-00 ), ( Part Type: Piston ), ( Material: Aluminum Alloy ), ( Vintage Part: Yes ), ( Country Of Origin: Japan )

Review YAMAHA New Oem Piston 2nd Overbore .50mm fits IT400 1977-78

Yamaha IT400 1W6-11636-00-00 Piston - 2nd Overbore, 50mm, for Year Model 1977-78

Description:

This is a genuine Yamaha replacement piston (Part No: 1W6-11636-00-00) designed specifically for the IT400 model motorcycles manufactured between the years 1977 and 1978. The piston undergoes Yamaha's rigorous quality control process to ensure optimal performance and reliability.

Key Features:

1. 2nd Overbore: This piston comes with a 50mm overbore, which is a common modification among enthusiasts for increased engine performance. The overbore allows for a larger bore diameter, enabling the engine to take in more fuel-air mixture for a more powerful combustion process.

2. High-quality Material: The piston is made from a high-strength aluminum alloy that offers excellent heat resistance, durability, and lightweight properties. The piston's skirt is designed with a honed finish for a perfect seal with the cylinder wall.

3. Precise Engineering: The piston is engineered with a precise fit and finish to ensure proper clearance with the crankshaft, connecting rod, and cylinder head. This ensures efficient power transfer and minimal friction for smooth engine operation.

4. Enhanced Performance: The piston's second overbore design allows for improved engine breathing, resulting in increased horsepower and torque. This makes the motorcycle more responsive and agile, providing a thrilling riding experience.

5. Engine Compatibility: This piston is compatible with the Yamaha IT400 motorcycles produced between 1977 and 1978, ensuring a perfect fit and function. It's essential to use the correct piston for your specific motorcycle make, model, and year to maintain optimal engine performance and longevity.

6. Easy Installation: Installing the new piston involves removing the old one and installing the new one with the correct rings and other components. It's recommended to consult the user manual or seek professional assistance for proper installation to ensure the best results.

By upgrading your motorcycle with this high-performance Yamaha IT400 piston, you'll enjoy increased power, improved engine breathing, and enhanced reliability. This piston is an excellent investment for any Yamaha IT400 enthusiast looking to take their motorcycle to the next level.

The Yamaha IT400 is a two-stroke, enduro-style motorcycle that was produced by Yamaha between 1977 and 1981. One common modification for these bikes is the use of a 50mm overbore piston, which can increase engine performance. Here are some pros and cons of buying a Yamaha 1W6-11636-00-00 piston, which is a second overbore piston for the IT400 engine:

Pros:

1. Increased power output: A larger piston allows the engine to compress more fuel-air mixture with each stroke, resulting in increased power output. This can make the bike faster and more responsive.

2. Improved torque: The larger piston also increases the engine's torque, making it easier to ride the bike in low-speed situations, such as climbing hills or riding in rough terrain.

3. Better engine breathing: A larger piston can improve engine breathing by reducing the compression ratio, allowing more air and fuel to enter the engine. This can lead to better fuel efficiency and increased power.

Cons:

1. Cost: A second overbore piston can be expensive, especially when compared to the cost of a stock piston. This could be a significant investment for some riders.

2. Complexity: Installing a second overbore piston requires removing the engine from the bike and performing a significant amount of engine work. This can be a complex and time-consuming process, especially for those without mechanical experience.

3. Potential reliability issues: Installing a second overbore piston can increase the risk of engine damage or reliability issues. This is because the engine is being modified to operate outside of its original specifications.

Conclusion:

A Yamaha 1W6-11636-00-00 piston can offer significant performance benefits for a Yamaha IT400, including increased power output, improved torque, and better engine breathing. However, these benefits come with some drawbacks, such as cost, complexity, and potential reliability issues. Ultimately, whether or not to purchase a second overbore piston for a Yamaha IT400 depends on the rider's goals, budget, and mechanical skills.

Recommendation:

If you are an experienced mechanic with a strong understanding of two-stroke engines and a significant budget for engine modifications, a second overbore piston for a Yamaha IT400 could be a worthwhile investment. However, if you are a beginner or have limited mechanical experience, it may be better to start with less complex modifications or seek professional help. Additionally, it is important to ensure that all necessary modifications are made to the engine to ensure safe and reliable operation.

Details:

New OEM Yamaha Piston 1W6-11636-00-00 2nd overbore .50mm 1977-78 IT400.

part #: 1w6116360000 prices

  • $25.00-$28.95

specifications pistondon:

  • for models: It400
  • for makes: Yamaha
  • for years: 1977-78
  • mpn: 1w6-11636-00-00
  • part type: Piston
  • material: Aluminum Alloy
  • vintage part: Yes
  • country of origin: Japan

returns pistondon:

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

general pistondon:

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

offer pistondon:

  • sold: 0
  • availability: In Stock
  • best offers: True
  • quantity: 2
  • options: Ship-to-home
  • started: March 16, 2026

payments pistondon:

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

shipping pistondon:

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

seller pistondon:

  • # reviews: 348
  • rating: 100.0%
  • city: Troy, New York
for models: it400, for makes: yamaha, for years: 1977-78, part type: piston, vintage part: yes, country of origin: japan,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, material: aluminum alloy, sku: 11240145521947721,

Yamaha 1W6-11636-00-00 Is Similar To:

pistondon logo
2 offers $25.00–$28.95 USD
  • Offer #1: $25.00 price + $9.66 shipping estimate = $34.66* total.+$9.66 shipping
  • Offer #2: $28.95 price + $12.36 shipping estimate = $41.31* total. Fits IT250/IT400(77-78). Yamaha.+$12.36 shipping

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