Honda GX340, GX390 genuine OEM thin style piston. This thin piston has the following specification(s):

• Honda 13101-Z1C-900

• Fits GX340 GX390 new style with thin piston only

• Does NOT include piston rings, order part 13010-Z5R-004

• Note: This piston DOES NOT fit all Honda GX340 & GX390 engines. This piston fits new style Honda GX340 & GX390 that uses thin piston rings. If you're unsure if your engine requires a new style or old style piston, please contact us with your serial number for fitment confirmation.