ITEM DESCRIPTION: Piston Kit with bearing for 43cc & 47cc engines with 40mm bore & 10mm wrist pin found on X1 X2 X8 X7 Mini Chopper, Mini Moto, Pocket bikes, Stand-Up Gas Scooters etc.
NOTE: This piston includes a 10mmID x 13mmOD bearing (I have another piston with a 10x14mm bearing in another listing). You must check your old bearing to know which your engine uses (You can also measure your rod small end ID to know if you need the 13 or 14mm OD bearing).