Technical Information · issue 3 of 2000

New Model BG 45 Blower

Model Air flow rate Air velocity Bystanders noise

IssueTI 3/2000

Full text

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Technical Information

03.2000
New Model BG 45 Blower - Series 4229

Contents
1. Technical Description
2. Specifications

3. Special Accessories for Users

4. Service Accessories
5. Repairs
6. Spare Parts

The new STIHL BG 45 is an addition to the range of Ergonomically designed controls and a high air flow
blowers. rate (air volume) ensure excellent efficiency and
less operator fatigue.
Due to extensive soundproofing, the BG 45

achieves a noise emission level comparable to that Typical applications are:
of electric units. . Garden, yard and land maintenance.
The engine is accommodated in a compact housing.
. Applications in noise-sensitive areas (such as
around schools and public buildings)

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1. Technical Description
Crankshaft
. Composite pressed together to form torsionally
rigid assembly.
. Both ends supported in bearings.

Cylinder
. Four port technology (better mixture control,
clean combustion, lower emissions).

. Large cooling area.

Carburetor

. BIS carburetor (with balanced idle system)* and
fixed idle jet
. Fixed full-load jet

. Only one adjusting screw (LD)

Air filter
. Improved filter material with longer life (foam
and felt elements)
. Large effective filter surface area

Exhaust muffler
. Dual-chamber muffler

Easy start® system
. Additional manual fuel pump
ElastoStart™ (special accessory)

Controls
. Multi-function handle

* Balanced idle system is described in detail in the “Carburetors” handbook.

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Technical Information 03.2000                                                                    Page 3

2.    Specifications

2.1   Powerhead

2.1.1 Engine
Displacement:              27.2 cm3 (1.66 cu.in)
Bore:                      34 mm (1.34 in)
Stroke:                    30 mm (1.10 in)
Engine power to            0.65 kW (0.9 HP)
ISO 8893:                  at 6,400 rpm

Engine speeds:             see 2.1.2

Rewind starter:            Single pawl system
Starter rope:              3 mm (0.12 in) dia.,
                           1060 mm (41.7 in) long

Model          Air flow rate    Air velocity    Bystanders noise

                                                per ANSI B 175.2-1999
               CFM              MPH             dB (A)
BG 45          391              125             65
1) Weighted equivalent level includes idling and racing with the same duration of exposure

2.1.2 Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump

Idle speed screw LD (standard setting)                             Open 2 full turns (see 5.1)

Idle speed                                                         2,500 to 3,100 rpm

Fuel tank capacity:            0.4 L (0.84 US pt)

2.1.3 Ignition System

Ignition module:        Electronic magneto ignition
Spark plug              Bosch WSR 6F,

(suppressed):           NGK BPMR 7 A or
                        Champion RCJ 6Y

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2.2   Weight

Without blower
tube              4.2 kg (9.25 lb)

3.    Special Accessories for Users
Part Name                            Part No.              Application

ElastoStart™                         0000 190 3400         Rewind starter (grip with rope)

Starter rope                         0000 195 8200         For ElastoStart™

Gutter cleaning attachment           4229 007 1001         Cleaning roof gutters

Fan nozzle                           4229 708 6301

4.    Service Accessories
4.1   Special Servicing Tools

Special servicing tools are listed in the service manual for the series 4140 powerhead.

4.2   Servicing Aids

Part Name                            Part No.              Application

Carburetor parts kit                 1129 007 1062         Zama
Set of gaskets                       4229 007 1050         Engine
Standard commercial solvent-                               Cleaning crankshaft stub
based degreasant containing no

chlorinated or hydrogenated
hydrocarbons

                                                                                             TI_03_2000_30_01.fm

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Technical Information 03.2000 Page 5

5. Repairs

If the unit is started up in the course of repairs or maintenance work, it is essential to strictly observe
all local and national safety regulations and the safety precautions outlined in the owner’s manual.

5.1 Carburetor Adjustment

Adjusting idle speed
. Check air filter and fit a new one if necessary.
. Carefully screw down the idle speed screw (LD) counterclockwise (left-hand thread)

until it is against its seat, then open it two full turns clockwise (this is the standard setting).

. Start and warm up the engine.
. Set idle speed correctly with the idle speed screw (LD):

The engine must not stop while idling and should accelerate smoothly.

Engine stops while idling:
. Turn the idle speed screw (LD) about one half turn clockwise until engine runs smoothly.
Erratic idling behavior, poor acceleration:
. Turn the idle speed screw (LD) about one half turn counterclockwise.

5.2 Tightening Torques
Tightening torques are listed in the service manual for the series 4140 powerhead.

5.3 Service Note
The service manual for the STIHL series 4140 powerhead can be used for servicing and repair procedures on
model BG 45.

This service manual does not include the chapters "Servicing the Carburetor", "Troubleshooting" or any repairs

involving standard procedures. Such procedures are described in separate handbooks, i.e. “Carburetors” and
"Standard Repairs, Troubleshooting".

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5.4 Repair Times
The specified repair times assume that the work is Code Type of Repair BG 45
performed by trained personnel in a properly 1 Crankcase, Crankshaft, 1.2
equipped service workshop. Crankshaft Bearings

The repair times are given in tenths of an hour 3 Crankcase Gasket/Sealing 1.0
(0.1 = 6 minutes). 4 Crankshaft Seals (includes 1.0
pressure & vacuum testing)
5 Cylinder and/or Piston 0.9
Note: This table for model BG 45 can be added to
6 Ignition Module 0.5
the STIHL repair times table.

7 Fuel Hose 0.5

9 Repair/Rebuild Carburetor 0.8
10 Replace Carburetor, Carburetor 0.4

6. Spare Parts Jet (if tried to repair use code 9)
11 Throttle Control, Throttle Cable 0.4
The new model will be included in the existing parts

documentation for models BG 55, 65, 85. 12 Recoil Starter 0.5
13 Fan Housing, Fan Wheel 0.5
The illustrated parts list for the BG 45 is included in
the next issue (03.99) of the microfiche and
CD-ROM.
14
15
Discharge Tube
Muffler
0.3
0.5
16 Air Filter, Filter Cover, Tank Cap, 0.4
Fuel Filter, Tank Vent, Spark Plug,
Miscellaneous Minor Repairs

17 Stop Switch 0.4
18 Fuel Tank 0.5

20 All Other Repairs 0.5

✂

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