1. Pistons, Rings & Piston Kits Products
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  3. YAMAHA 3E1-11635-00-00

YAMAHA 3E1-11635-00-00 Piston Overbore 109-11635-01-00 .25MM U5

fits make: Yamaha.

3e1-11635-00-00 Yamaha 109-11635-01-00 New Oem Piston 1st Overbore .25mm Sub U5

( Part Type: Piston ), ( Material: Aluminum Alloy ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 109116350100 )

Review YAMAHA New Oem Piston 1st Overbore .25mm Sub U5

The Yamaha 109-11635-01-00 Piston Overbore Kit is an essential upgrade for Yamaha XT250, XT225, and XT200 motorcycle models. This kit includes three overbored pistons (3E1-11635-00-00 U5) with a 25mm bore diameter, designed to enhance the performance and durability of your engine.

Each piston is meticulously crafted with high-quality aluminum alloy, ensuring a lightweight yet robust construction. The overbore design increases the cylinder volume, resulting in improved combustion efficiency and more power. The piston tops are treated with a Nikasil coating, which provides excellent heat dissipation and reduces friction between the piston and cylinder walls.

These pistons come with optimized piston rings, ensuring a perfect seal and reducing the chance of oil leaks. The piston skirts are designed with a parabolic shape, which enhances the piston's rigidity and improves ring sealing.

The Yamaha 109-11635-01-00 Piston Overbore Kit also includes new piston pins, which are made from high-tensile steel and have been treated with a nitriding process for increased strength and durability. The piston pin bushings are also included in the kit, ensuring a precise fit and reducing the chance of engine wear.

In summary, the Yamaha 109-11635-01-00 Piston Overbore Kit is an excellent investment for riders seeking to enhance the performance and longevity of their Yamaha XT250, XT225, or XT200 motorcycle engine. With its high-quality materials, precise engineering, and proven design, this kit is sure to provide superior results and a more enjoyable riding experience.

Yamaha 109-11635-01-00 Piston Overbore Kit (3E1-11635-00-00 U5) - Pros, Cons, and Conclusion

The Yamaha 109-11635-01-00 Piston Overbore Kit (3E1-11635-00-00 U5) is an aftermarket upgrade designed for specific Yamaha outboard engines. This kit aims to improve engine performance and durability by increasing the piston bore size by 25mm. In this article, we will discuss the advantages and disadvantages of using this piston overbore kit.

Pros:

1. Enhanced Engine Performance: The larger piston bore size allows for more fuel and air to be burned in each cycle, resulting in increased power output and torque.

2. Improved Thermal Efficiency: The piston overbore kit facilitates better combustion, which in turn leads to improved thermal efficiency and reduced fuel consumption.

3. Increased Displacement: With the larger piston size, the engine's total displacement increases, providing more power and improved acceleration.

4. Enhanced Durability: The piston overbore kit is designed using high-quality materials, ensuring long-lasting performance and resistance to wear and tear.

Cons:

1. Higher Cost: The Yamaha 109-11635-01-00 Piston Overbore Kit is a premium aftermarket upgrade, and the cost may be a significant investment for some boat owners.

2. Custom Installation: Installing the piston overbore kit requires specialized skills and knowledge, which may necessitate professional installation to ensure proper engine functioning.

3. Potential Engine Damage: Improper installation or incorrect use of the piston overbore kit can lead to engine damage, potentially requiring expensive repairs or engine replacement.

Conclusion:

The Yamaha 109-11635-01-00 Piston Overbore Kit (3E1-11635-00-00 U5) offers significant advantages for boat owners looking to enhance their outboard engine performance and durability. However, it comes with a premium price tag and the need for professional installation. Additionally, the potential for engine damage if not installed correctly is a major concern.

Recommendation:

If you are a serious boat owner seeking maximum performance and durability from your Yamaha outboard engine, the piston overbore kit may be a worthwhile investment. However, ensure that you work with a certified and experienced installer to minimize the risk of engine damage. Proper installation and maintenance will help you enjoy the benefits of this upgrade for years to come.

Details:

New OEM Yamaha Piston 109-11635-01-00 1st overbore .25mm supersedes to 3E1-11635-00-00. Other numbers 109-11635-02- 109-11631-11-00 and 109-11631-12-00.

part #: 109116350100 prices

  • $20.00-$38.17

specifications pistondon:

  • for makes: Yamaha
  • part type: Piston
  • material: Aluminum Alloy
  • vintage part: Yes
  • country of origin: Japan
  • upc: 109116350100

shipping pistondon:

  • cost: $8.62
  • carrier: FedEx
  • type: Calculated
  • transit: 4-9 Days
  • service: FedEx Ground Economy
  • class: Economy

offer pistondon:

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

general pistondon:

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

seller pistondon:

  • city: Troy, New York
  • rating: 100.0%
  • # reviews: 356

payments pistondon:

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

returns pistondon:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted
for makes: yamaha, 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: 11250839924947721,

Yamaha 109-11635-01-00 Is Similar To:

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4 offers $20.00–$38.17 USD
  • Offer #1: $20.00 price + $8.62 shipping estimate = $28.62* total. Other numbers 109-11635-02-00, 109-11631-11-00 and 109-11631-12-00. New OEM Yamaha Piston 1st overbore +.25mm supersedes to.+$8.62 shipping
  • Offer #2: $20.00 price + $8.62 shipping estimate = $28.62* total. Other numbers 109-11631-21-00 and 109-11636-01-00. New OEM Yamaha Piston 109-11636-02-00 2nd overbore +.50mm supersedes to 3E1-11636-00-00.+$8.62 shipping
  • Offer #3: $38.17 price + $20.94 shipping estimate = $59.11* total.+$20.94 shipping
  • Offer #4: $28.36 price + $14.31 shipping estimate = $42.67* total.+$14.31 shipping

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