GY6 Tappet Adjusters - Nut & Screw Rocker Arm Tappet Adjusters for 150cc and 125cc GY6 4-stroke QMI152/157 and QMJ152/157 engines and 150cc GY6 4-stroke ZNEN engines commonly found in Bintelli, Gorilla Motor Works (GMW) and Puma scooters. Set of 2 Thread Size: M5x0.50