Chainsaw STIHL 051, 076 Service Manual
Troubleshooting, parts diagrams, and service data for STIHL 051, 076 chain saws. Includes part numbers 5 277 720 and updated repair procedures.
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Stihl Models Covered & Key Technical Specifications
Models: STIHL 051, 051 AV, 051 AV electronic, 076, 076 AV, 076 AV electronic, 050, 075
Sub-models / Variants: 051 AV, 051 AVE, 075 AV, 076 AV, 076 AVE
Build Years: 1980
Serial Numbers: Up to machine No. 5 277 720 (050, 051, 075), machine No. 3 001 400 (051 AV ignition), machine No. 2 981 245 (051 AV edge gap), machine No. 4 755 571 (gasket update)
Technical Data:
- Engine: Single cylinder, two-stroke, processed cylinder bore
- Displacement: 89 cc (051), 111 cc (075, 076)
- Compression Ratio: 9.5:1
- Max Torque: 5.9 Nm at 5000 rpm (051), 6.8 Nm at 5000 rpm (075, 076)
- Max Engine Speed: 10,000 rpm
- Clutch: Centrifugal, 86 mm diameter, engages at approx. 2700 rpm
- Ignition Timing: 1.9–2.1 mm before T.D.C. (breaker-controlled), 2.5 mm before T.D.C. (electronic)
- Fuel Capacity: 0.9 liter (051)
- Bar Lengths: 43, 53, 63, 75 cm (051); 43, 53, 63, 75, 90 cm (075)
- Oil Pump Delivery: 7–19 cm³/min at 6000 rpm
Stihl Manual Features & Content Preview
STIHL 051 and 076 Chainsaw Technical Documentation
- Covers 1980 STIHL 051 and 076 chainsaws, including 051 AV, 075, and 076 AVE variants with specialized two-stroke engine and ignition configurations
- Original OEM publication, manual code 0455 111 0123
- Contains 47 exploded-view diagrams, 4 diagnostic flow charts, and comprehensive torque specification tables
- Downloads to your account within seconds of checkout
- Suitable for printing individual sections for shop-floor use
- This 256-page volume documents the technical differences between early breaker-controlled ignition and later electronic ignitions found on 1117-series saws
Engine and Fuel System Overview
This manual provides technical documentation for the STIHL 051 and 076 series two-stroke engine architectures, detailing crankcase construction and piston assemblies. The technical data section lists critical clearances for crankshaft bearings, big-end needle cages, and cylinder bore specifications for the 89 cc and 111 cc engine displacement groups. Fuel system documentation describes the operation of the all-position diaphragm carburetor, including fuel pump pulse-line mechanics and jet adjustment settings.
Ignition, Lubrication, and Maintenance
The documentation segments include technical descriptions of the magneto ignition system, covering both early breaker-controlled magnetos and later transistor-controlled electronic ignitions. Ignition timing is specified at 1.9–2.1 mm before T.D.C. for breaker-controlled systems. The chain lubrication system section details the automatic oil pump, including adjusting lever settings for delivery rates of 7–19 cm³/min. Lubrication pump output is specified in the service guide for consistent oil flow across various chain pitches.
Note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 256-page STIHL OEM service manual covering the 051 and 076 chainsaws, documenting engine, fuel, electrical, and chassis specifications for the 1117-series chainsaw build.
Document Reference: Original OEM manufacturer publication, Form 0455 111 0123
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