STIHL BG 56, BG 56 C, BG 66, BG 66 C, BG 86, BG 86 C Service Manual

This service manual contains detailed descriptions of all the repair and servicing procedures specific to this power tool. Part numbers can be identified by the STIHL logo.

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Stihl STIHL BG 56, BG 56 C, BG 66, BG 66 C, BG 86, BG 86 C Service Manual manual page preview - page 1 of 178

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Stihl Models Covered & Key Technical Specifications

Models: STIHL BG 56, BG 66, BG 66 C, BG 86, BG 86 C, SH 56, SH 86
Sub-models / Variants: SH 56 C, SH 86 C, ErgoStart variants, Blower and Vacuum models
Build Years: 2008
Technical Data:

  • Engine displacement: 27.2 cm³
  • Engine power (BG 56, SH 56): 0.70 kW (1.0 bhp)
  • Engine power (BG 66, BG 66 C): 0.60 kW (0.8 bhp)
  • Engine power (BG 86, SH 86): 0.8 kW (1.1 bhp)
  • Idle speed: 2500 rpm
  • Spark plug: NGK CMR 6 H
  • Spark plug electrode gap: 0.5 mm
  • Ignition module air gap: 0.15–0.30 mm
  • Engine leakage test pressure: 0.5 bar
  • M5 screw torque: 3.5 Nm
  • Fanwheel/crankshaft nut torque: 17.0 Nm
Technical Specifications
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Document Number / Seller:
30204 / Joseph Cooper
File Size:
8.23 MB
File Type:
PDF
Language:
English
Pages:
178
Printable:
Yes
Category:
Leaf Blower
Last updated / verified
Apr 17, 2026

Stihl Manual Features & Content Preview

STIHL BG 56, BG 66, BG 86, SH 56, SH 86 Service Manual

  • Covers 2008 STIHL BG 56, BG 66, BG 66 C, BG 86, BG 86 C, SH 56, and SH 86 leaf blower and vacuum units including engine, ignition, and fuel system diagnostics
  • Official STIHL service publication, 2008-01 revision
  • Contains detailed exploded-view assembly diagrams, bolt torque specifications, electrical troubleshooting flow charts, and specific diagnostic test procedures
  • File delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • Laid out for standard letter and A4 printing
  • This 2008-01 edition provides the standardized service reference for the entire BG and SH 56/66/86 series engine and blower housing configurations

Engine and Fuel System Documentation

The STIHL BG 56, BG 66, BG 86, SH 56, and SH 86 service manual provides specialized documentation for two-stroke blower and vacuum maintenance. The content includes detailed removal and installation procedures for the engine assembly, piston, cylinder, and crankshaft. Technicians are provided with factory-specified leakage test procedures using a 0.5 bar vacuum or pressure setting to diagnose seal and gasket integrity. The fuel system section covers carburetor service, including metering diaphragm replacement, inlet needle inspection, and tank vent testing.

Technical Specification Preview

This manual details specific tightening torques for plastic and metal fasteners, such as 3.5 Nm for M5 screws used in the filter housing and carburetor flange assembly. Engine power ratings are documented per model, ranging from 0.60 kW for the BG 66 to 0.8 kW for the BG 86. Spark plug electrode gap is specified at 0.5 mm, and the ignition module air gap is defined at 0.15–0.30 mm. Reference only — always consult a certified technician before performing service on this equipment. This is a 178-page technical publication for professional workshops and experienced owners covering the engine, fuel, and electrical service requirements of the 2008-series STIHL blowers.

Manual FAQ, Purchase & Download Details

Which specific specification tables are included for the engine systems of the BG 56, BG 66, and BG 86 series? keyboard_arrow_down

Manual includes comprehensive specification tables that list engine displacement, bore, stroke, power ratings, permissible speeds, and idle speed data for the different model variants.

Are there detailed exploded view diagrams and parts illustrations provided for the major engine assemblies? keyboard_arrow_down

Document contains numerous exploded view diagrams and illustrations that show the installed positions of individual components and assemblies. These visual references support the identification of parts and their respective locations within the machine.

Does the manual provide reference charts for tightening torques and standardized fastener specifications? keyboard_arrow_down

Tightening torque tables are provided to list the required benchmarks for various fasteners used throughout the power tool assemblies. These tables specify the torque values for components such as the muffler, cylinder, and fan housing.

What is the official publication date and page count of this specific STIHL service manual? keyboard_arrow_down

Service manual is identified by the 2008-01 publication date and consists of 178 pages of technical documentation.

Is there a section that covers electrical system components like the ignition module and connector wires? keyboard_arrow_down

Document includes specific chapters dedicated to the ignition system, which cover the ignition module, flywheel, spark plug connections, and ground wire arrangements. It also provides troubleshooting guidance for electrical conditions without detailing repair procedures.

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