Shop › 1615 Bush 1″ Bore 5/16 Keyway Image 1 of 1 1615 Bush 1″ Bore 5/16 Keyway $38.50 Add To Cart Added! 1/4” Keyway1″ BoreSuitable for Honda GX630 engines or any engines with a 1” shaft. You Might Also Like 1615 Bush 1 1/8″ Bore 5/16 Keyway $38.50 Optibelt Omega HP 720-8M-30 $86.90 HTD Timing Pulley 32-8M-50 $75.90 Tensioner Arm ONLY $130.90 2517 Bush 30mm Bore 8mm Keyway $49.50