1975 Norton 850 Commando Mark 3 Workshop Manual (200 P.)
Documents the 850 Commando Mark 3 electric-start model with complete engine, transmission, brake, and electrical system service procedures plus maintenance tables. Reference: Publication 00-4224.
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Sample pages from the 1975 Norton 850 Commando Mark 3 Workshop Manual (200 P.) manual
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Models Covered & Key Technical Specifications
Norton 850 Commando Mark 3 (Electric Start) — 1975 Licensed Specification Index | Mark 3 Series Repository.
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Reference Linear Velocity: Engine rated displacement is standardized to 828 cc (50.5 cu in) as the cylinder volume Benchmarks.
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Integral Form Factor: For optimal combustion, compression ratio determines 8.4:1 as the chamber pressure Range.
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General Optical Resolution: Maximum power output is calibrated to 56 lb-ft at 5,000 rpm representing peak torque Sequences.
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Certified Storage Capacity: The valve lift is rated at 0.375 in (9.525 mm) providing intake and exhaust opening Baseline.
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Factory Electrical Specs: Front fork oil capacity achieves 150 cc (5 fl oz) per leg as the damping requirement Requirements.
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Established Operational Speed: Steering head bearing spacing corresponds to 128.524 mm head tube length as the assembly Threshold.
Professional Workshop Service Manual & Technical Specifications
Certified Technical Installation Manual: Norton 850 Commando Mark 3 Workshop Manual (1975) Repository
Component-Focus: Norton 850 Commando Mark 3 Electric Start models (1975) // Reference-Category: Workshop and Maintenance Technical Documentation // Engine-Type: 828 cc Twin Parallel Twin Cylinder with Electric Start.
| Documentation Section | Content Coverage | Technical Status |
|---|---|---|
| Engine Systems | Top-end and bottom-end overhaul procedures, crankshaft servicing, lubrication systems | Complete specifications provided |
| Primary Transmission | Clutch assembly, primary chain tensioner, electric starter reduction gear train | Full component specifications |
| Gearbox Assembly | Four-speed transmission, selector fork positioning, bearing specifications | Documented assembly procedures |
Cataloging major assemblies into engine and transmission systems, this comprehensive resource encompasses cylinder head removal and rocker servicing, gearbox dismantling and reassembly techniques, establishing primary transmission and clutch operation, and documenting suspension unit adjustment procedures and brake hydraulic system maintenance. The manual presents exhaust system removal and refitting procedures, front fork operation and steering head bearing renewal specifications, rear wheel bearing reassembly sequences, and electrical system charging circuit description.
Electrical system documentation covers alternator output verification, rectifier bridge configuration, Zener diode regulation function, and battery charging and maintenance protocols. Suspension service documentation covers Girling damper unit spring adjustment, swinging arm pivot bushing renewal, and Isolastic engine mounting clearance verification procedures. Disassembly instructions are documented for cylinder bores and pistons, connecting rod and crankshaft components, and oil pump gear-type configuration. Wear limits are specified for valve guide interference fits, main bearing journal regrinding dimensions, clutch friction plate thickness evaluation, and piston ring gap measurement standards.
System operation descriptions cover oil circulation routing through crankshaft oil seals and rocker feed passages, engine breather separation of oil mist from crankcase vapors, hydraulic disc brake pressure lines and caliper piston seal operation, and front fork damping valve action during compression and extension cycles. The manual documents torque specifications for engine assembly securing bolts and fastener hardware to ensure proper component assembly and structural integrity across the entire motorcycle platform.
| Tables | Technical Index | Specifications | Reference Material |
|---|---|---|---|
| System Categories | Engine/Primary/Gearbox/Brakes | Bearing sizes, spring rates, oil capacities | See relevant chapter introductions |
| Component Details | Nuts, bolts, fasteners, seals | Torque settings in foot-pounds and kilogram-meters | Section-by-section specifications |
| Reference Topics | Conversion tables, technical data | Imperial/metric measurements, electrical loads, wire gauges | Appendix reference data |
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