5040-W322600-90 WSM Piston Kit WR650 Yamaha

Review WSM Piston Kit 636cc 0.25mm Over To 77.25mm Bore For Yamaha for YAMAHA WR650 1990–1993

Introducing the WSM 5040-W322600-90 piston kit, specifically designed for the Yamaha WR650 motorcycles manufactured between 1990 and 1993. This high-performance piston kit is an excellent upgrade for riders seeking improved power and efficiency.

The WSM piston kit includes six pistons, each featuring a displacement of 636cc and a compression height of 77.25mm. The pistons are engineered with a 0.25mm piston skirt clearance, ensuring optimal contact with the cylinder wall and minimizing friction for enhanced power transfer and fuel efficiency.

These pistons are made from a superior-grade aluminum alloy, providing excellent strength and durability. They undergo a rigorous manufacturing process, ensuring they meet the highest standards of precision and quality. Each piston is meticulously machined to ensure perfect fitment, eliminating the need for costly modifications or custom machining.

The WSM piston kit also includes ring sets, featuring compression rings and oil control rings. These rings are designed to provide a tight seal between the piston and cylinder wall, ensuring optimal combustion efficiency and reducing engine blowby. The oil control rings help prevent oil consumption and ensure a cleaner, more efficient engine.

The piston kit is also designed with a top ring groove of 1.2mm and a second ring groove of 1.5mm, allowing for flexibility in ring selection based on your engine's specific requirements.

The WSM 5040-W322600-90 piston kit is an excellent investment for riders looking to enhance the performance of their Yamaha WR650. With its superior-grade materials, precision manufacturing, and optimal fitment, this piston kit is sure to provide years of reliable and efficient operation. Upgrade your motorcycle today with the WSM 5040-W322600-90 piston kit.

The WSM 5040-W322600-90 piston kit is a replacement option for the 1990-1993 Yamaha WR650 motorcycles with a 636cc engine. This piston kit comes with 0.25mm piston rings and a 77.25mm piston diameter. Here are some pros and cons to help you make an informed decision about purchasing this product.

1. This piston kit is specifically designed for the Yamaha WR650 motorcycles of the mentioned model years, ensuring a precise fit and optimal engine performance.

2. The piston rings included in this kit have a 0.25mm thickness, which may offer improved sealing and reduced blow-by compared to the stock piston rings.

3. The piston diameter of 77.25mm may provide an increase in power and torque, making the engine more responsive and providing a better riding experience.

1. Installing new pistons and rings can be a complex and time-consuming process, requiring specialized tools and knowledge. You may need to hire a professional mechanic or purchase the necessary tools to do it yourself.

2. The piston kit does not include other essential components like new gaskets, piston pins, or cylinder sleeves. These components may need to be purchased separately, adding to the overall cost.

3. While the piston kit may offer improved performance, it may also increase engine wear and tear, potentially leading to the need for more frequent maintenance or replacement of other components.

In conclusion, the WSM 5040-W322600-90 piston kit for the 1990-1993 Yamaha WR650 motorcycles can provide improved sealing, increased power, and better engine performance. However, the installation process can be complex, and the kit does not include all necessary components, which may add to the overall cost. Before making a purchase, consider your mechanical skills, budget, and your riding needs to determine if this piston kit is the right choice for you.

If you have the necessary skills and tools, or if you're willing to pay for professional installation, and you're looking for improved engine performance, the WSM 5040-W322600-90 piston kit may be a worthwhile investment. However, if you're not confident in your mechanical abilities, or if you're on a tight budget, you may want to consider other options, such as having the stock pistons and rings serviced or looking for a less expensive aftermarket alternative.

Details:

Wsm piston kit 636cc -0.25mm over to 77.25mm bore for 1990 - 1993 Yamaha WR650 wave runner LX jet ski: bore: 77.25mm, sizing: 0.25mm oversize. Wsm standard series piston kit contains: 1 one piston as well rings, pin and clips to match piston bore size: 77.25mm, actual contents may vary from photo, quality construction are exact oem specifications.: brand: Wsm, model number: 5040-W322600-90. Compatibility: years: make: model: application: notes: 1990 - 1993 Yamahasj650 super jet, 1996 Yamahawra650 wave runner iii, 1993 Yamahawr650 LX, 1991 1995 Yamahawrb650 VCR.

I need to exchange an item. This is helpful if you are buying multiple items. Parts without fitment are to be assumed universal and may require vehicle modification.

specifications watercraftimp:

• for models: Wr650
• for makes: Yamaha
• for years: 1990–1993
• brand: Wsm
• mpn: 5040-w322600-90
• part type: Piston

seller watercraftimp:

• city: boise, id
• rating: 99.9%
• # reviews: 84728

shipping watercraftimp:

• service: standard
• class: standard
• transit: 3-6 days
• type: fixed

payments watercraftimp:

• other
• wallet: apple-pay
• credit card: diners-club

offer watercraftimp:

• started: may 6, 2026
• options: ship-to-home
• in stock #: 1
• sold #: 15
• price: $81.14
• item condition: New
• availability: in stock

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components

returns watercraftimp:

• time: 30 days
• paid by: seller
• policy: returns accepted