This timing chain fits all GY6 engines as defined below:

• All long case 150cc to 200cc scooter engines
• All short case 150cc to 200cc go-kart engines both internal and external reverse engines.
• All 150cc to ATV engines.

Be sure to oil before use, and loosen the adjustment on the auto chain tensioner before final assembly.

Replace these items together. They're all sold separately.