19 Tooth 428 Chain Front Engine Sprocket for GY6 150cc ATVs Quad 4 Wheeler Go Kart Dune Buggys Sandrail Roketa Taotao Sunl Coolster 19 Tooth 428 Chain Front Engine Sprocket. Top Quality Guaranteed. 19 Tooth 428 Chain Front Engine Sprocket for GY6 150cc ATVs, Go Karts Compatible with 150cc GY6 Engine with built-in reverse gear Outside Diameter: 1.15"; Inside Diameter: 0.79"; Height: 1.92"; Please check pictures and specifications for compatibility