Colony Crankcase Bolt Kits

39 products — part of all Crankcase Bolt Kits

Colony crankcase bolt kits cover the earliest Harley-Davidson engine cases in the catalogue — the 1936 to 1939 74 and 80-inch Flathead side-valve, the 1936 to 1939 Knucklehead, the 1937 to 1973 45-inch Servi-Car, the 1940 to 1947 Knucklehead, and the 1940 to 1948 74 and 80-inch Flathead. Pre-war Harley-Davidson crankcase hardware is a specialist topic: the bolt grade, thread standard, and plating specification for a 1937 Knucklehead are different from any post-war generation, and a restorer fitting an incorrect fastener through a pre-war case is a mistake that shows. Colony's almost 50-year commitment to cataloguing Harley-Davidson hardware from 1911 to the present — more than 3,000 engineered kits — makes their pre-war crankcase sets uniquely accurate. Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, stocks Colony through Iron Stable. For a period-correct engine case rebuild on a Knucklehead or pre-war Flathead Harley-Davidson, Colony is the definitive source. Browse the full Colony Crankcase Bolt Kits range below.