Category: Performance Upgrades for Personal Watercrafts Introduction: Personal watercrafts, also known as jet skis or sea doos, are a popular recreational activity that allows individuals to enjoy the thrill of riding on the water. However, these vehicles can be limited in their performance and speed due to their standard bore engines. This is where performance upgrades come into play. Performance upgrades involve modifying the engine or other components of the personal watercraft to improve its power output, acceleration, and overall performance. In this review, we will explore some of the best performance upgrades available for personal watercrafts, specifically focusing on piston kits and top end kits. Piston Kits: Piston kits are one of the most common types of performance upgrades for personal watercrafts. These kits typically involve replacing the standard pistons with oversized ones that have a larger bore size. This allows more air and fuel to enter the cylinder, resulting in increased power output and acceleration. One popular option is the WK Top End Kit (643cc) - 0.50mm Oversize to 76.50mm Bore for 1987 Kawasaki JS650 650SX Personal Watercrafts. This kit provides a significant boost in power and acceleration, making it an excellent choice for those looking to take their personal watercraft to the next level. The oversized pistons also provide improved reliability and durability compared to the standard pistons. Another option is the Piston Kit - Standard Bore 76.00mm For 1987 Kawasaki JS650 650SX Personal Watercrafts. While this kit does not provide as much of a power boost as the oversized pistons, it can still improve the overall performance and speed of the personal watercraft. The standard bore size also makes it easier to install and maintain compared to the oversized pistons. Piston kits are generally easy to install and require minimal tools. However, it is important to note that some kits may require additional modifications to the engine or other components in order to achieve optimal performance. It is always recommended to consult with a professional mechanic before making any modifications to your personal watercraft. Top End Kits: Top end kits are another popular type of performance upgrade for personal watercrafts. These kits typically involve replacing the standard top end with an oversized one that has a larger bore size. This allows more air and fuel to enter the cylinder, resulting in increased power output and acceleration. One option is the WK Top End Kit (643cc) - 0.50mm Oversize to 76.50mm Bore for 1989 Kawasaki JS650 650SX Personal Watercrafts. This kit provides a significant boost in power and acceleration, making it an excellent choice for those looking to take their personal watercraft to the next level. The oversized top end also provides improved reliability and durability compared to the standard top end. Another option is the WK Top End Kit (657cc) - 1.00mm Oversize to 77.00mm Bore for 1989 Kawasaki JS650 650SX Personal Watercrafts. This kit provides an even greater boost in power and acceleration compared to the previous option, making it a popular choice among experienced riders. The oversized top end also allows for increased fuel efficiency and improved reliability. Top end kits can be more difficult to install than piston kits due to their larger size and complexity. It is important to consult with a professional mechanic before attempting to install any top end kit, as improper installation can result in damage to the engine or other components. Conclusion: Performance upgrades for personal watercrafts are an excellent way to improve the power output, acceleration, and overall performance of these vehicles. Piston kits and top end kits are two popular types of performance upgrades that can provide significant improvements in speed and power. However, it is important to note that these modifications require careful consideration and professional installation to ensure optimal results and avoid damage to the engine or other components.