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 HTD Timing Pulley 34-8M-50 $75.90 HTD Timing Pulley 64-8M-50 $251.90 Omega Optibelt 800-8M-50 $218.90 2517 Bush 24mm Bore 8mm Keyway $49.50 Optibelt Omega HP 720-8M-30 $86.90