Specs: Top-End Piston Kit, Compression Ratio: 10.2:1, Cylinder Diameter: 80 mm, Displacement: 800 cc, Piston Diameter: 79.950mm ENGINEER-TESTED EXCELLENCE: All of our wiring products go through a rigorous testing program developed by prestigious engineers to ensure optimal output and performance. This relay switch produces high quality output in any weather conditions. MECHANICS CHOICE: Our key to success is selling parts that fit and perform like the originals, which is why beginner and professional mechanics make us their top choice. We offer electrical parts and motors for your car, electric lawn mower, truck, boat, PWC, motorcycle, ATV, tractor or virtually anything you ride or drive. Trusted Seller: Vertex is your go-to seller for quality and reliability. With a strong reputation for excellence, we offer a wide range of premium products backed by our exceptional customer service. Shop with confidence knowing that you are buying from a seller who values your business and strives to exceed your expectations. 100% New Aftermarket Top-End Piston Kit built to meet OEM specifications