## Foot Start Sprocket 72mm 139QMB/QMA (GY6 50) 4T This durable foot start sprocket, measuring 72mm in length, is designed for scooters with a 139QMB/QMA (GY6 50) 4T engine. Made of steel, it guarantees reliability and a long service life, even under demanding operating conditions. A bushing is included for easy installation. ### Technical Specifications: * **Total Shaft Length:** 72mm * **Bushing Length:** 21mm * **Shaft Diameter:** 14mm * **Outer Bushing Diameter:** 18mm * **Spline Diameter:** 13mm ### Benefits: * **Durable Steel Construction:** Ensures resistance to wear and tear and mechanical damage. * **Complete Set with Bushing:** Facilitates and speeds up installation. * **Precise Manufacturing:** Guarantees a perfect fit for the 139QMB/QMA (GY6 50) 4T engine. * **Reliability:** Provides reliable scooter starting in all conditions. * **Ease of Use:** Simple and intuitive foot start operation.