14" x 5/8" Jackshaft 3/16" Keyway Go Kart / Mini Bike Parts. Description: 14" long. This is the popular 5/8" diameter jackshaft with a 3/16" keyway. PLEASE CHECK OUT OUR STORE FOR MORE EXCITING AND HARD TO FIND PARTS FOR GO KARTS, MINI BIKES, DIRT BIKES AND ATVS