1941 Knucklehead Motor Start-Up Posted by Highway Classics on August 31, 2016 Posted in: Engine Shop. Tagged: Engine Rebuild, Knucklehead. This is a motor that we completely rebuilt, balances and blueprinted. All finishes are correct for 1941. Posts navigation ← Dennis O’s 1946 Indian Chief Detailed Review and First Ride Bruce’s 1942 WLA Military 45 ci Motor Start-Up →