Cylinder kit 40mm for Yamaha FS1

Ostrypt Cylinder 50cc with 40mm piston, for Yamaha FS1. Intended for speed wind cooled engines. Develops 3~5hp depending on other equipment. Exhaust pipe attachment: Thread Intended for engines with slide feed Made of cast iron Inspected and supplemented with NTS quality piston in Sweden. NOTE: The cylinder must be cleaned carefully before assembly as chips or grinding dust from production may occur! For the longest possible durability and service life the cylinder kit should be "run in" during the first approx. 20 miles. Suitable piston (included): 13529 Suitable gasket kit: 13216