This kit includes all items to flow test Taotao 49cc scooter with engine code (1P39QMB) cylinder bore and heads on YOUR flowbench. Items included are plastic bore cylinder with 5-1/2 ” mounting studs and a 2.187″ I.D. bore. The fixture fits superflow bench with 5″ square bolt pattern, valve opening dial indicator, brass rod with quick adjustment bracket, test springs and hardware. (Note cylinder bore and head are not included.)