Norton motorcycle dating

The primary chain tensioning bolt tended to loosen at inconvenient times.

The rear chain adjusting bolts pushed, rather than pulled, the rear axle, and would bend, making them difficult to turn.

The early clutches could not handle the engine torque, and two small internal pins would shear off, leading to severe slippage (later resolved).

The side-stand tended to break off, particularly if the owner insisted on starting the machine on the side-stand, leaving a hole in the frame beneath the engine, while the center-stand was too short to provide good support for the motorcycle, dragged on the pavement, and tended to break in half (both later improved).

In 1972 both bearings became roller-type, and the crankcase was stiffened.