The taper on NPT threads allows them to form a seal when tightened

where builders stripped their bikes down to bare essentials for a narrow

Viscosity & Size: This is a straight 60 weight engine oil and is sold in a 1-quart bottle

one set per motor) for all 650cc and 750cc unit twins as well as pre-unit twins 1954 to 1962 with single piece cranks

The design of these 3-piece

#8809-6 Stem Bolt & Cover Kit 1957-1978 Harley-Davidson Sportster - Chrome Plated Inside Diameter_.75" The taper on NPT threadsComplete kit includes sleeve, stem bolt, dust shield, spacer, rubber plug, and chrome cover. 1957 78 Harley Davidson Sportster without steering damper. Made in Ohio, USA.