New Complete Jackshaft kit, 5/8" by 12". This is very popular for use on Go-carts and Mini bikes. This Kit includes 5/8" by 12" Jackshaft 3/16" Keyway . 8 Tooth Sprocket with built in Key, 5/8" ID. 14 Tooth Sprocket, 5/8" ID. 2 Bearing hangers. 2 Sealed Precision Bearings. 1 key, 3/16" by 3/16" by 3/4". 2 Collar 5/8" ID. This kit will work for 40/41/420 chains. PLEASE CHECK OUT OUR STORE FOR MORE EXCITING AND HARD TO FIND PARTS FOR SMALL ENGINES LIKE GO KARTS, MINI BIKES, DIRT BIKES, ATVS, LAWNMOWERS, GENERATORS AND MORE.