Technical Information · issue 15 of 1999
New backpack brushcutter
Model FR 125 FR 135 FR 145
IssueTI 15/1999
Full text
Page 1 of 4
Technical Information
15.1999
New Model FR 125, 135 and 145 Brushcutters - Series 4126, 4135, 4113
Contents
1. Technical Description
2. Specifications
3. Cutting Tools
4. Special Accessories for Users
5. Repairs
6. Spare Parts
FR 125 fo FR 135
FR 145
The new FR 125, 135, 145 backpack brushcutters The FR 125, 135 and 145 feature a flexible shaft
are additions to the existing STIHL line of from the powerhead to the straight drive tube which
brushcutters. houses a rigid drive shaft.
Ergonomically designed controls and a favorable The new models are designed primarily for cutting
power to weight ratio ensure easy handling and weeds, grass, scrub and shrubs.
greater operator comfort.
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)m~ge 2 Technical Information 15.1999
1. Technical Description
Crankshaft
. Three parts pressed together to form torsionally
rigid assembly.
. Both ends supported in bearings.
Cylinder
. Large cooling area.
Carburetor
. Three adjusting screws (H, L, LA).
Air filter
. Improved filter material with longer life.
. Large effective filter surface area.
Exhaust muffler
. Dual-chamber muffler.
Easy start system
. Manual fuel pump
. ElastoStart (special option)
Controls
. Throttle lever (speed setting lever)
. Stop button
Clutch
. Lined clutch shoes.
Drive shafts
. Flexible shaft supported in protective liner.
. Straight drive tube rigid shaft supported in ball
bearings.
AV system
. Three-point AV system with springs.
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Technical Information 15.1999 Page 3
2. Specifications
2.1 Powerhead
2.1.1 Engine
Model FR 125 FR 135 FR 145
Displacement: 25.6 cm3 (1.56 cu.in) 34.4 cm3 (2.10 cu.in) 44.8 cm3 (2.73 cu.in)
Bore: 33 mm (1.30 in) 37 mm (1.46 in) 41 mm (1.61 in)
Stroke 30 mm (1.18 in) 32 mm (1.26 in) 34 mm (1.34 in)
Engine power to ISO 8893: 0.9 kW (1.2 bhp) 1.2 kW (1.6 bhp) 1.5 kW (2.0 bhp)
at 7,500 rpm at 7,500 rpm at 7,500 rpm
Speeds: see 2.1.2 see 2.1.2 see 2.1.2
Rewind starter: Single pawl Single pawl Single pawl
Starter rope: 3.0 mm (0.12in) dia., 3.0 mm (0.12in) dia., 3.8 mm (0.15in) dia.,
890 mm (35in) long 850 mm (33.5in) long 1150 mm (45.3in) long
Clutch:
- Clutch engages at: 3300 - 3700 rpm 3300 - 3700 rpm 3300 - 3700 rpm
2.1.2 Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump
Model FR 125 FR 135, 145
Low speed screw L (standard setting) Open 1 full turn Open 1 full turn
Idle speed 2700 - 3000 rpm 2700 - 3000 rpm
High speed screw H (standard setting) Open 1 full turn Open 1 full turn
Cut-off speed without cutting tool
(control valve) rated 10000 rpm ---
Fuel tank capacity: FR 125 FR 135 FR 145
0.55 l (1.16 US pt) 0.65 l (1.37 US pt) 0.80 l (1.7 US pt)
2.1.3 Ignition System
Spark plug NGK BPMR 7 A, Bosch WSR 6F or Champion RCJ 6Y
(suppressed):
2.2 Weight
Without cutting tool and deflector: FR 125 FR 135 FR 145
8.1 kg (17.8 lb) 9.0 kg (19.8 lb) 9.6 kg (21.1 lb)
3. Cutting Tools
The following cutting tools are approved
STIHL cutting blade 230-2 4001 713 3805 replacement only
STIHL cutting blade 230-4 4001 713 3801 replacement only
STIHL cutting blade 265-2 for production
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)m~ge 4 Technical Information 15.1999
4. Special Accessories for Users
4.1 General
Part Name Part No. Application, Remarks
Starter rope 0000 195 8200 Rewind starter, also for ElastoStart
ElastoStart 0000 190 3400 Rewind starter (grip with rope)
STIHL gear lubricant for Drive shaft in tube
hedge trimmers
- 80g/3oz tube 0781 120 1109
- 225g/8oz tube 0781 120 1110
STIHL gear lubricant for Gearhead
brushcutters
- 80g/3oz tube 0781 120 1117
- 225g/8oz tube 0781 120 1118
STIHL special oil
Rewind spring in starter,
- 100ml/3.5fl.oz bottle 0781 417 1315 bearing bore in rope rotor
Flat sharpening file 0814 252 3356 Cutting blades 230-2, 230-4, 265-2
Flat sharpening file 0814 412 3310 Cutting blades 230-2, 230-4, 265-2
5. Repairs
If the unit is started up in the course of repairs of 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 Service Note
A separate shop manual will be available in the near future for servicing and repair procedures on models
FR 125, 135 and 145.
This shop 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".
6. Spare Parts
An illustrated parts list is available for the new models.
© 1999 Andreas STIHL AG & Co. Technical Documentation
Waiblingen D1/MTK-na 6519
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.