[Application] SR500 (all years) SR400 (all years of carburetor vehicles) [Material] Aluminum [Specifications] Piston diameter: 89mm Displacement: 418cc/SR400 522.6cc/SR500 Reference compression ratio: .8.5:1/SR400 10.3: 1/SR500 (Genuine; Piston diameter: 87mm Displacement: 399cc/SR400 499cc/SR500) [Manufacturing method] Forged [Parts contents] ・Yoshimura piston ・Piston ring ・Piston pin ・Circlip ・Gasket set (head gasket, base gasket ) Cylinder boring is required to incorporate the Yoshimura piston kit. Since this work is very important, please have it done by a reliable factory/shop and strictly adhere to the dimensions specified by Yoshimura Japan. Increase the number of displayed items

Among the main parts that control the source of powerful power, the piston is placed under particularly harsh conditions. At the forefront of the compression and explosion process, it plays an important role in producing powerful power. It must be remembered that the piston head forms part of the combustion chamber. It must be remembered that the piston head forms part of the combustion chamber. Therefore, the head part has a small surface area and a smooth shape, so that it can obtain a sufficient compression ratio without interfering with the valve, can withstand the pressure and high heat of an explosion, has good airtightness with the cylinder, and has good sliding resistance with the cylinder. Many conditions are required, including low dynamic resistance, appropriate lubrication, light weight as it is a reciprocating part, and minimal thermal changes. Yoshimura's original piston kits are created under these strict conditions. The image is an illustrative image. Cylinder boring is required to incorporate the Yoshimura piston kit. This work is very important, so please have it done by a reliable factory/shop and strictly adhere to the dimensions specified by Yoshimura. In addition, Yoshimura also accepts precision boring services, so please feel free to contact us. (The boring is done at a reliable factory selected by Yoshimura.)


Manufacturer: YOSHIMURA Brand: YOSHIMURA Model name: 200- 351-E890
Package size: ‎24.1 x 20 x 13.9 cm; 937.99 g
Product model number: ‎200-351-E890
Product weight: ‎938 g