WISECO 393P2 Piston Kit

( Brand: Wiseco ), ( Manufacturer Part Number: 393P2 ), ( Part Type: Piston ), ( Vintage Part: Yes ), ( Performance Part: No )

Review WISECO Yamaha Piston Kit See Below fits RD350 RD400 1973-82

WiseCo 393P2 Piston Kit for 1973-1982 Yamaha RD350 and RD400 Motorcycles

The WiseCo 393P2 Piston Kit is an excellent upgrade solution for the owners of the iconic Yamaha RD350 and RD400 motorcycles from the 1973 to 1982 period. This piston kit, manufactured by WiseCo, is specifically designed to enhance the performance and durability of these classic two-wheeled machines.

The pistons in this kit are forged from high-quality aluminum alloy, ensuring superior strength and heat resistance. The piston crown shape is optimized for efficient combustion, enhancing power output and improving overall engine performance. The piston rings are made from a nitrided steel alloy, ensuring a perfect seal and minimizing the risk of compression loss.

The piston kit also comes with new piston pins, which are made from chrome-molybdenum steel, known for its high strength and resistance to wear and fatigue. The piston pin bushings are included in the kit, ensuring a smooth and snug fit for the piston pins.

The WiseCo 393P2 Piston Kit is a direct replacement for the stock pistons in the RD350 and RD400 engines. The pistons are precision machined to ensure a perfect fit in the engine cylinder, and they come with new piston rings and piston ring grooves machined into the pistons.

Installing the WiseCo 393P2 Piston Kit is a straightforward process, and it can be done with the use of standard hand tools. The kit includes detailed instructions to guide you through the installation process.

In conclusion, the WiseCo 393P2 Piston Kit is an essential upgrade for any Yamaha RD350 or RD400 motorcycle from the 1973 to 1982 period. It not only enhances the performance of the engine but also improves its durability, ensuring that these classic motorcycles continue to run strong for years to come.

Buying a WISCO 393P2 piston kit for a 1973-1982 Yamaha RD350 or RD400 can be a beneficial upgrade for performance-oriented riders. Here are some pros and cons to consider before making a purchase.

1. Increased Power: The WISCO piston kit is designed to provide increased power output. The oversized pistons and rings are engineered to handle higher compression ratios, resulting in better combustion efficiency and increased horsepower.

2. Enhanced Durability: The pistons in this kit are made from forged aluminum, making them stronger and more durable than the original OEM pistons. This can help extend the life of the engine, especially for high-performance riding.

3. Improved Thermal Efficiency: The oversized pistons help increase the engine's thermal efficiency by reducing the amount of heat lost to the cooling system. This can lead to improved fuel economy and better overall engine performance.

4. Easy Installation: The WISCO piston kit comes with all the necessary components for a complete installation, including new piston rings, wrist pins, and gudges. This can save time and money compared to sourcing individual parts.

1. Higher Cost: The WISCO piston kit is more expensive than the original OEM pistons. Riders looking to save money may be better off sticking with the stock parts.

2. Increased Complexity: Installing a performance piston kit like the WISCO 393P2 requires more expertise and experience than a standard piston replacement. Riders without the necessary skills or tools may want to consider having the work done by a professional mechanic.

3. Potential Compatibility Issues: While the WISCO piston kit is designed to fit the 1973-1982 Yamaha RD350 and RD400 engines, there is always a risk of compatibility issues. Riders should ensure that their specific engine model and year are compatible before making a purchase.

4. Potential Impact on Reliability: Increasing the engine's performance can also increase the risk of reliability issues. Riders should be prepared for the possibility of additional maintenance or repairs as a result of the upgraded pistons.

In conclusion, the WISCO 393P2 piston kit offers several benefits for performance-oriented riders, including increased power, enhanced durability, improved thermal efficiency, and easy installation. However, it also comes with some potential drawbacks, such as higher cost, increased complexity, potential compatibility issues, and potential impact on reliability. Ultimately, the decision to purchase this kit depends on the individual rider's goals, skills, and budget. For those who are willing to invest in the upgraded components and have the necessary expertise to install them, the WISCO piston kit can be an excellent choice for improving the performance of their Yamaha RD350 or RD400. For those who are unsure or have limited experience with engine upgrades, it may be worth considering alternative options or seeking the advice of a professional mechanic.

Details:

Lots more parts for many different bikes. //Please look close at pictures before buying. This part could fit other Bikes # RNS MIDDLE #2 WEST SIDE.

part #: 393p2 prices

• $78.99-$188.37

specifications pistondon:

• for models: Rd350, Rd400
• for makes: Yamaha
• for years: 1973-82
• brand: Wiseco
• mpn: 393p2
• part type: Piston
• vintage part: Yes
• performance part: No

seller pistondon:

• city: Clinton, Montana
• rating: 99.8%
• # reviews: 12390

shipping pistondon:

offer pistondon:

• quantity: 2
• availability: In Stock
• sold: 0
• started: November 27, 2025
• options: Ship-to-home
• best offers: True

returns pistondon:

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

general pistondon:

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

payments pistondon:

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

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