Target Audience:
Norton Commando owners, restorers, and independent motorcycle mechanics
Intended Use:
Parts identification, rebuild, refurbishment, and restoration work
Advantage:
Complete official parts catalog data for the MK3, the final and most refined Commando variant
Era Significance:
The 850 MK3 was the last Commando generation, ending Norton's air-cooled twin production run
Engine:
828cc air-cooled parallel twin with isolastic frame mounting
Electric Start:
Standard on MK3 models
Brakes:
Front disc brake, rear drum brake
Engine Assembly:
Cylinder head, barrels, pistons, crankshaft, and internal components
Fuel System:
Carburetors, fuel tank, petcocks, and lines
Ignition System:
Coil ignition components, spark units, and wiring
Electric Start:
Starter motor, solenoid, and related MK3-specific components
Transmission:
Gearbox internals, gear clusters, and shift mechanism
Clutch:
Clutch plates, springs, and actuation components
Frame:
Isolastic frame, engine mounts, and rubber components
Front Forks:
Telescopic fork internals, sliders, and seals
Wheels and Brakes:
Front disc brake, rear drum brake, wheel, hub, and spindle parts
Wiring:
Complete wiring schematics and harness component listings
Parts Identification:
Exploded view diagrams with OEM part numbers for every assembly
Rebuild Reference:
Component listings supporting repair, rebuild, and refurbishment
Restoration Support:
Correct part numbers for authentic restoration work
Detail Level:
Complete component-level breakdown of every assembly
Diagrams:
Detailed exploded illustrations and diagrams
Schematics:
Wiring schematics included
Specifications:
Specifications and step-by-step instructions included
Part Numbers:
Original Norton factory part numbers throughout
Interchange Data:
MK3-specific components identified, including electric start parts
Illustrations:
Line drawings keyed to part listings
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Type:
Air-cooled 4-stroke parallel twin
Displacement:
828cc (approximately 828cc / 50.5 cu in)
Bore and Stroke:
Approximately 77.6mm x 89mm
Compression Ratio:
Approximately 8.9:1
Carburetor:
Twin Amal carburetors
Power Output:
N/A - not specified in this parts catalog
Top Speed:
N/A - not specified in this parts catalog
Electric Start:
Factory electric starter with backup kickstart
Instrumentation:
Speedometer and tachometer
Lighting:
12-volt electrical system
Assistance Systems:
None - 1975 vintage motorcycle, no electronic rider aids
Engine Oil:
N/A - parts catalog only; see service manual for intervals
Chain Adjustment:
Regular primary and final drive chain inspection recommended
Isolastic Mounts:
Periodic check and adjustment of rubber isolastic components
Engine Oil:
N/A - not specified in this parts catalog
Gearbox Oil:
N/A - not specified in this parts catalog
Isolastic Rubbers:
Known wear item on all Commando models
Amal Carburetors:
Carb rebuild kits and jets commonly replaced
Fork Seals:
Front fork seals and stanchions are frequent renewal items
Manufacturer:
Norton Motors (Norton-Villiers-Triumph era)
Commando Introduction:
Commando launched in 1967 with the isolastic frame
MK1:
1968-1970, 750cc Fastback and roadster variants
MK2:
1971-1974, revised styling and disc front brake
MK3:
1975, final Commando version with electric start and right-side shift
Country:
United Kingdom (Wolverhampton / Andover, England)
