659P2 WISECO Overbore Forged Piston Sts Zxi Jet Ski Stx 900

Review WISECO 73.5mm Overbore Forged Piston Kawasaki Sts Zxi Jet Ski for KAWASAKI STX 900

The WISCO 659P2 659M07350 73.5mm Overbore Forged Piston Kit is a high-performance upgrade designed specifically for Kawasaki Jet Skis with the model numbers 900 STX, STS, and ZXI. This piston kit is an excellent choice for jet ski owners who are looking to enhance their engine's power and durability.

Each piston in this kit is meticulously forged from premium-grade aluminum alloy. The forging process gives the pistons exceptional strength, allowing them to handle the rigors of high-performance jet skiing. The pistons also feature a 73.5mm overbore, which increases the engine's displacement and provides more power and torque.

The pistons in this kit come with matching rings, ensuring a perfect fit and optimal engine performance. The rings are made from high-quality materials that provide excellent sealing and durability, reducing the risk of engine blowby and improving overall engine efficiency.

The piston tops are machined to precise tolerances, ensuring a perfect fit in the cylinder bore. The piston skirts are also designed with a thin, optimized profile that minimizes friction and reduces piston slap, resulting in smoother engine operation and improved engine life.

The pistons in this kit are also designed with cooling in mind. They feature a unique design that enhances cooling flow, reducing the risk of piston overheating and improving overall engine reliability.

Installation of the WISCO 659P2 659M07350 73.5mm Overbore Forged Piston Kit is relatively straightforward, but it is recommended that the installation be performed by a professional jet ski mechanic to ensure proper installation and optimal engine performance.

In summary, the WISCO 659P2 659M07350 73.5mm Overbore Forged Piston Kit is an excellent upgrade for Kawasaki Jet Skis with the model numbers 900 STX, STS, and ZXI. This piston kit provides increased power, improved durability, and enhanced cooling, making it an ideal choice for jet ski owners who demand the best performance from their watercraft.

Buying a Wiseco 659P2 659M07350 73.5mm overbore forged piston for a Kawasaki 900 STX/STS/ZX jet ski can offer several potential benefits, along with some considerations.

1. Increased Power: Overbore pistons allow for increased displacement, resulting in more power output. This can lead to improved acceleration and top end speed.

2. Enhanced Durability: Forged pistons are known for their superior strength and durability compared to cast pistons. They can better withstand the high compression and heat generated during jet ski operation, extending engine life.

3. Improved Efficiency: The forged pistons' increased strength allows for higher compression ratios, which can lead to improved fuel efficiency and better overall engine performance.

4. Customization: The Wiseco piston kit is designed specifically for the Kawasaki 900 jet ski engines, ensuring a proper fit and optimal performance.

1. Cost: Overbore pistons and forged pistons can be more expensive than stock pistons. The investment in these upgrades may not be feasible for all budgets.

2. Installation: Installing an overbore piston kit and forged pistons requires specialized knowledge and tools. It's essential to ensure the installation is done correctly to avoid any potential damage or issues.

3. Jet Ski Modifications: Installing an overbore piston kit and forged pistons may be just one part of a larger engine modification plan. Consider the potential impact on other engine components and the overall cost and complexity of the project.

The Wiseco 659P2 659M07350 73.5mm overbore forged piston kit for a Kawasaki 900 STX/STS/ZX jet ski can offer significant power gains, improved durability, and increased efficiency. However, it also comes with a higher cost, the need for specialized installation, and potential considerations regarding other engine modifications.

If you are looking for improved performance, power, and durability for your Kawasaki 900 STX/STS/ZX jet ski and have the budget for it, the Wiseco 659P2 659M07350 73.5mm overbore forged piston kit could be a worthwhile investment. Ensure that the installation is done by a qualified professional to ensure optimal performance and engine longevity.

Details:

1x Wiseco 659M07350 73.50mm forged pistons. Wiseco part number: 659M07350 - as used in wk1101 piston kit. Wiseco high performance 903cc forged overbore piston for Kawasaki 900 personal water craft applications.

specifications watercraftimp:

• for models: Stx, 900
• for makes: Kawasaki
• brand: Wiseco
• mpn: 659p2
• part type: Jet Piston
• unit quantity: Each
• country of origin: United States

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components

payments watercraftimp:

• wallet: apple-pay
• other
• credit card: mastercard

offer watercraftimp:

• prices: $139.99–$156.99
• item condition: New
• options: ship-to-home
• in stock #: 3
• started: december 20, 2025
• sold #: 9
• availability: in stock

returns watercraftimp:

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

seller watercraftimp:

• city: clearwater, florida
• # reviews: 22814
• rating: 100.0%

shipping watercraftimp:

• type: calculated
• class: standard, expedited
• transit: 6-10 days
• carrier: usps
• service: usps first class, usps priority mail, usps priority mail express