WISECO ORWI-CO425705-ON Piston Bike 86.5MM

( Brand: Wiseco ), ( Manufacturer Part Number: ORWI-CO425705-ON ), ( Part Type: Piston )

Review WISECO Yamaha Dirt Bike Piston 86.5mm fits YZ400 1977–1978

Introducing the WISECO ORWI-CO425705-ON piston, specifically designed for the 1977 and 1978 Yamaha YZ400 motorcycles. This piston is an excellent upgrade for riders seeking enhanced performance and reliability.

Measuring 86.5mm in bore size, this piston is meticulously crafted from high-quality forged aluminum alloy. Its precise shape and dimensions ensure a snug fit within the engine cylinder, minimizing the potential for unwanted play or excess clearance.

The WISECO piston features a state-of-the-art cooling fin design, which effectively dissipates heat generated during combustion. This cooling fin design not only increases the piston's durability but also maintains optimal engine temperatures, contributing to the overall efficiency and longevity of your engine.

The piston crown is engineered with a domed shape, allowing for a more efficient transfer of energy during the power stroke. This design increase the compression ratio, which translates into more power being generated from each combustion cycle.

The piston ring grooves are machined with the utmost precision, ensuring the rings fit perfectly and seal effectively. This minimizes the potential for blow-by and reduces power losses, allowing for improved engine performance and fuel efficiency.

WISECO's piston is also accompanied by a matching conrod (connecting rod) and piston pin, ensuring a complete and cohesive upgrade. These components are meticulously crafted from high-quality materials, ensuring a perfect fit and seamless integration into your engine.

In summary, the WISECO ORWI-CO425705-ON piston is an excellent upgrade for 1977 and 1978 Yamaha YZ400 motorcycles. Its high-quality materials, precise dimensions, and advanced design features contribute to enhanced performance, reliability, and longevity. This piston is the ideal choice for riders seeking to maximize the potential of their classic Yamaha YZ400.

Wiseco or WI-CO425705-ON 1977-1978 Yamaha YZ400 Piston: A Comparison and Recommendation

Wiseco is a well-known aftermarket piston manufacturer for various motorcycle brands. Their pistons are often praised for their high-performance capabilities, durability, and precise machining.

a. Enhanced Power: Wiseco pistons are designed to deliver increased horsepower and torque, making them an excellent choice for performance enthusiasts.

b. Durability: Wiseco pistons are engineered to withstand the rigors of high-performance riding, ensuring long-lasting use.

c. Precision Machining: Wiseco's attention to detail and exacting machining techniques result in pistons that fit perfectly in the engine, ensuring optimal engine performance.

a. Cost: Wiseco pistons are typically more expensive than OEM (original equipment manufacturer) pistons due to their high-performance capabilities.

b. Customization: Wiseco pistons offer various options for customization, such as different ring materials and skirt coatings, which can add to the cost and complexity of the installation process.

The WI-CO425705-ON piston is an aftermarket offering specifically designed for the 1977-1978 Yamaha YZ400. This piston may offer performance benefits and cost savings compared to the OEM piston.

a. Competitive Pricing: The WI-CO425705-ON piston may be more affordable than the Wiseco piston, making it an attractive option for budget-conscious riders.

b. Performance Gains: Depending on the specific design and materials used, this aftermarket piston may offer performance gains comparable to the Wiseco piston.

a. Unknown Manufacturer: The WI-CO425705-ON piston comes from an unknown manufacturer, which may raise concerns regarding quality and durability compared to a reputable brand like Wiseco.

b. Limited Information: Due to the lack of detailed information about the WI-CO425705-ON piston, it is difficult to assess its exact performance capabilities and potential drawbacks.

Both the Wiseco piston and the WI-CO425705-ON piston offer performance benefits for the 1977-1978 Yamaha YZ400. However, the Wiseco piston is a well-established, high-performance aftermarket option with a proven track record, while the WI-CO425705-ON piston is an unknown quantity.

Based on the available information, the Wiseco piston is the recommended choice for those seeking a high-performance, reliable, and durable piston option for their 1977-1978 Yamaha YZ400. While the WI-CO425705-ON piston may offer cost savings, the potential risks of an unknown manufacturer and limited information make it a less attractive choice for most riders.

Details:

Parts without fitment are to be assumed universal and may require vehicle modification.: Brand: Wiseco, model Number: ORWI-CO425705-ON. This is helpful if you are buying multiple items. 1977-1978 Yamaha YZ400 Dirt Bike Wiseco Piston 86.5mm: Compatibility: YZ4 Size: 86.5mm.

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part #: orwico425705 price

• $203.53

specifications pistondon:

• for models: Yz400
• for makes: Yamaha
• for years: 1977-1978
• brand: Wiseco
• mpn: Orwi-co425705-on
• part type: Piston

returns pistondon:

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

seller pistondon:

• rating: 99.9%
• city: Sparks, NV
• # reviews: 74643

payments pistondon:

• credit card: Discover
• wallet: Paypal
• other

offer pistondon:

• started: January 10, 2026
• quantity: 6
• options: Ship-to-home
• sold: 0
• availability: In Stock

general pistondon:

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

shipping pistondon:

• class: Standard
• cost: $0.00
• transit: 3-5 Days
• type: Fixed
• service: Standard

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