This exhaust pipe gasket for the Baja Sun City 50 (SC50) motor scooter may fit other scooters with the ubiquitous 50cc 4-stroke GY6 139QMB gas scooter engine.Description This exhaust pipe gasket for the Baja Sun City 50 (SC50) motor scooter may fit other scooters with the ubiquitous 50cc 4-stroke GY6 139QMB gas scooter engine. ? WARNING California Residents: Proposition 65 Warning Specifications Inner Diameter: 22 mmOuter Diameter: 29 mmThickness: 4.5 mm