Crankshaft Re-Grinding Details for Norton Lightweight Twins
Download the complete PDF version using the green download button at the top right of this page for a crankshaft re-grinding reference covering Norton lightweight twin engines. This technical drawing provides the correct crankpin diameters and face radius requirements for first, second and third undersize re-grinds.
The sheet clearly identifies the machining dimensions for each re-grind stage and shows where the crankshaft should be stamped after the work is completed. It also highlights the importance of maintaining the specified .095"–.090" face radius during every grinding operation.
Contents Include
- Crankshaft re-grinding data for Norton lightweight twins
- First re-grind crankpin size: 1.4905"–1.4900"
- Second re-grind crankpin size: 1.4805"–1.4800"
- Third re-grind crankpin size: 1.4705"–1.4700"
- Required .095"–.090" face radius
- Crankshaft stamping locations for .010, .020 and .030 undersizes
- Clear machining diagrams for each re-grind stage
