Norton Commando 750 850 Workshop Manual 1970 Onwards PDF – Interstate Roadster Fastback SS Hi Rider Interpol

Description

Norton Commando 750 850 Workshop Manual — File Details

• Manual Type: Workshop Manual
• Brand: Norton (Norton Villiers Ltd.)
• Models: Commando 750 and 850 — Interstate, Roadster, Hi Rider, Interpol, Fastback, “SS”, S Type, Fastback L.R.
• Coverage: From 1970
• Part Number: 065146
• Copyright: 1973, Norton Villiers Ltd., Wolverhampton
• Language: English
• Pages: 172
• File Format: PDF
• Note: European Type 850 MK1A variations are covered in a separate supplement; not included in this document.

Sections Covered

The Norton Commando 750 850 Workshop Manual is organised into lettered sections, each covering a major system. Sections are laid out in disassembly and reassembly order, with line illustrations throughout. A separate glossary of British/American part name equivalents is provided at the front.

• Section A — Technical Data: Complete engine specifications for both 750 (745 cc) and 850 (828 cc) variants — bore, stroke, compression ratios, crankshaft materials and dimensions, connecting rod specifications, piston and ring data, cylinder block and head dimensions, camshaft profiles (Standard and Combat), valve timing, ignition timing, contact breaker settings, spark plug specification, carburetor settings by year and model, torque settings for every major fastener, gearbox ratios and pinion tooth counts, overall gear ratios, speedometer gearing, capacities, and wheel/brake/fork/electrical specifications
• Section B — Conversion Tables
• Section C — Engine/Primary Drive: Engine top end (cylinder head removal/servicing/refitting, cylinders and pistons), engine bottom end (crankcase removal from frame, dismantling, crankcase overhaul, crankshaft servicing, connecting rod removal and refitting, crankcase and crankshaft reassembly), engine accessory systems (lubrication, oil pump, other lubrication components), timing (timing cover, timing side assembly, tachometer), ignition (ignition timing, auto advance and contact breaker), primary transmission (primary chaincase removal, dismantling and assembling primary transmission and clutch, chains), and engine complete removal and refitting
• Section D — Gearbox: Description, dismantling, inspection of gearbox parts, assembly, servicing gearbox outer cover, changing countershaft sprocket, removing gearbox from motorcycle
• Section E — Carburetor and Air Filter: Description of Amal concentric float carburetors, removal and disassembly, examination and reassembly, carburetor adjustment (main jet, pilot jet, needle and needle jet), fuel taps, air filter
• Section F — Frame and Ancillaries: Removal and refitting of power unit complete, frame checking dimensions, servicing suspension units (shocks), servicing swinging arm, fuel tank removal and replacement, oil tank removal and replacement, accessory and side covers, servicing the Isolastic mounting assembly, rear fender, exhaust systems
• Section G — Forks/Steering Head Bearings: Description of telescopic hydraulically damped forks, removing and dismantling forks, servicing steering head bearings, refitting front forks
• Section H — Brakes, Wheels and Tyres: Removing and dismantling rear wheel, reassembling and refitting rear wheel, servicing disc front wheel, servicing drum front wheel, rear brake adjustment, front brake adjustment (drum), drum brake overhaul, Norton-Lockheed disc brake, tyres
• Section J — Electrical: Description, charging system, alternator (RM 21), rectifier, Zener diode, battery and fuse, warning light and assimilator, ignition switch (pre-1971 and 1971-onward models), coils, capacitors, ballast resistor, contact breaker and auto advance, spark plugs, lighting system, head and tail lamps, handlebar switch clusters, power take-off socket, flashing direction indicators, alternating horn set (Police), horn adjustment, electrolytic capacitor, making a 1 Ohm test resistor, wiring diagrams
• Section K — Routine Maintenance: Breaking in, routine maintenance introduction, maintenance table, engine/gearbox/primary oil service, swing arm pivot lubrication, front fork oil, hydraulic brake fluid level, battery electrolyte level, spark plugs, tire pressure, adjusting cam timing chain

The scope of this Norton Commando Workshop Manual is thorough by the standards of any parallel-twin workshop reference — from pulling a cylinder head and lapping valves, through splitting the cases and servicing the crankshaft, to diagnosing the Isolastic engine mounting system that gives the Commando its defining vibration-isolation characteristic. The electrical section addresses both pre-1971 and 1971-onward ignition switch configurations, and documents the full charging circuit from the RM 21 alternator through the Zener diode regulator — a system that still trips up even experienced mechanics.

Models and Engine Variants Covered

The manual addresses both the 750 cc (745 cc, 2.875 in. bore, 3.503 in. stroke) and 850 cc (828 cc, 3.030 in. bore, 3.503 in. stroke) engines, and both Standard and Combat states of tune. Combat engine differences — higher compression (10:1 vs 9:1 on the 750), revised camshaft profiles, Combat carburetor jetting, and tighter valve timing — are documented throughout the Technical Data and engine sections. The eight model variants share the same fundamental architecture but differ in fuel tank capacity, equipment levels, and exhaust configurations; where relevant, the manual notes model-specific differences.

The Isolastic Mounting System

One of the technically most important sections of this Norton Commando 750 850 Workshop Manual is the coverage of the Isolastic engine mounting system in Section F. Unlike conventional unit-construction motorcycles, the Commando carries its engine, gearbox, and swinging arm as a sub-assembly isolated from the main frame by rubber-bonded bushings. Correct setting of the front and rear mounting clearances — with specified shim thicknesses and free-play limits — is what keeps the Commando’s handling sharp and its vibration levels low. This manual documents both Method 1 and Method 2 front mounting service procedures in full.

Why This Workshop Manual Belongs on Your Bench

For anyone rebuilding, restoring, or maintaining a Norton Commando 750 or 850, this is the primary technical reference. Torque figures, clearances, carburetor jetting by year, gearbox ratio tables, electrical component types, and fork oil capacity are all in Section A’s Technical Data — the kind of information that is otherwise scattered across period magazine articles and club tech sheets. The step-by-step disassembly and assembly procedures with line illustrations make this manual usable by an owner-mechanic as well as a shop technician.

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