Norton Power Tuning – Motor Cycle Mechanics, June 1978
Download the complete PDF version using the green download button at the top right of this page for a classic June 1978 Motor Cycle Mechanics feature on Norton Commando power tuning. Written by Dave Walker, this illustrated period article follows tuning advice and workshop methods associated with Mick Hemmings, focusing on ways to make the Commando engine stronger, more responsive and better suited to fast road or competition-style use.
The article covers a broad range of Norton engine tuning work, beginning with cylinder head and valve improvements, exhaust thread repair, camshaft sprocket removal, oil seal care and checking oil pump wear. It then moves into practical engine strip-down and bottom-end work, including crankcase separation, cam chain tensioner updates, crankshaft cleaning, oilway preparation and precautions when removing pistons, connecting rods and crank components.
Later sections discuss larger valves, opened-out ports, lightened rockers, 4S camshaft selection, valve train concerns, rod balancing, crankshaft balance factors, piston and valve pocket comparisons, oil pickup modifications and breather relocation. The magazine pages combine workshop photographs, captions and tuning commentary, making this a valuable period reference for anyone interested in traditional Norton Commando engine performance development.
Contents Include
- June 1978 Motor Cycle Mechanics Norton power tuning feature
- Dave Walker article with Mick Hemmings tuning insight
- Cylinder head, valve and porting recommendations
- Exhaust thread repair and workshop repair notes
- Camshaft sprocket removal and timing cover precautions
- Oil pump, oil seal and engine strip-down guidance
- Crankcase separation and cam chain tensioner discussion
- Rocker lightening and 4S camshaft reference
- Connecting rod and crankshaft balance considerations
- Piston crown, valve pocket and compression comparisons
- Oil pickup and breather modification notes
- Period workshop photographs and tuning captions
