Azusa Jack Shaft Kit - 5/8in. x 10in. Go Kart/Minibike Complete Jackshaft Kit 5/8" X 10" Brand New. This Kit includes 5/8" by 10" Jackshaft. 8 Tooth Sprocket with built in Key for # 40/41 Chain, 5/8" ID. 14 Tooth Sprocket for #40/41 Chain, 5/8" ID. 2 Bearing Hangers. 2 sealed, precision Bearings. 1 key, 3/16" by 3/16" by 3/4". 1 Collar 5/8" ID.