Shop › 1615 Bush 1 1/8″ Bore 5/16 Keyway Image 1 of 1 1615 Bush 1 1/8″ Bore 5/16 Keyway $38.50 Add To Cart Added! 1/4” Keyway1 1/8″ BoreSuitable for Honda GX690 engines or any engines with a 1 1/8” shaft. You Might Also Like Optibelt Omega HP 720-8M-30 $86.90 Omega Optibelt 800-8M-50 $218.90 Tensioner Arm and Roller $250.80 HTD Timing Pulley 64-8M-30 $196.90 HTD Timing Pulley 32-8M-50 $75.90