Simple commuter thumper with its roots in the sixties (CB100/150). Engine life (20 to 40,000 miles) depends entirely on frequent (750 mile) oil changes. Whilst town work’s okay, the combination of wobbly frame, fading drum brakes and crude vibration make speeds over 60mph a test of character, but some wicked thrashing is possible. Piston, camchain and camshaft most likely areas of demise. Later J version had better disc brake but poorer performance and economy.