Stihl BR420 Specs
Displacement 56.5 cc (3.44 cu. in.)
Weight 8.9 kg (19.6 Ibs.)
Fuel Capacity 1500 cc (50.7 oz.)
Air Volume With tubes: 880 m/h (518 cfm)
Without tubes: 1230 m/h (724 cfm)
Air Velocity 77 m/sec. (172 mph)
Optional Accessories:
• Spray conversion kit 4203-007-1001
• Curved nozzle/tube conversion kit 4203-007-1031
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Order Stihl BR420 Backpack Blower Parts
4203 141 0301 Air Filter
4203 120 1500 Pre Filter
4203 701 6102 Blower Tube
Walbro HD-4A, HD-4B, HD-13B Carburetor
D10-HD Carburetor Gasket and Diaphragm Kit (Walbro HD)
K10-HD Carburetor Rebuild Kit (For Walbro HD)
4203 120 2200 Carburetor Manifold Spacer
4203 182 9501 Choke Knob
4203 020 1201 Cylinder and Piston Kit (46mm)
4203 029 2300 Cylinder Base Gasket
4203 704 3402 / 4203 700 3401 Fanwheel
4223 350 0500 Fuel Cap
0000 350 3502 / 0000 350 3520 Fuel Filter (Zama ZF-4)
4203 350 7600 Fuel Line
4203 400 1200 Flywheel
4203 007 1050 Gasket Set
4203 400 1302 Ignition Coil
4203 140 0602 Muffler
4203 030 2001 Piston
1118 034 3001 Piston Rings
Bosch WSR6F Spark Plug
Champion RCJ6Y Spark Plug
NGK BPMR7A Spark Plug
Champion RCJ6Y Spark Plug
NGK BPMR7A Spark Plug
4203 190 0405 Starter (Recoil)
4116 195 7200 Starter Pawl
0000 190 3401 Starter Handle
1118 190 0600 Starter Spring
4203 790 1307 Throttle
4203 180 1111 Throttle Cable
4203 182 1000 Trigger
Stihl BR420 Part Number Lookup
Crankcase, Cylinder:
1 4203 020 2106 Crankcase
2 9371 470 2610 Cylindrical pin 5x18
3 9465 620 2620 Snap ring 37
4 9523 003 4260 Grooved ball bearing 15x35x13
5 9503 003 0340 Grooved ball bearing 6202
6 4116 030 0400 Crankshaft
7 1120 036 8500 Woodruff key 2x3.7
8 9640 003 1600 Oil seal 15x29.6x4
9 9640 003 1340 Oil seal 13x22x5
10 4203 029 0500 Gasket
11 9022 341 1050 Spline screw IS M5x25
16 9463 650 1000 Snap ring 10
17 4203 020 1201 Cylinder with piston Ø 46mm
18 4203 030 2001 Piston Ø 46mm
19 1118 034 3001 Piston ring Ø 46x1.5mm
20 1110 034 1500 Piston pin 10x32
21 9512 003 2343 Needle cage 10x14x13
22 4203 029 2300 Cylinder gasket
23 1115 149 0600 Exhaust gasket
24 0000 400 7000 Spark plug NGK BPMR7A
25 1110 400 7005 Spark plug Bosch WSR 6 F
26 0000 998 0603 Torsion spring
27 1106 405 1000 Spark plug boot
28 4203 180 2150 Support
29 Washer 5.3 (D)
30 Spline screw IS M5x20 (D)
31 ? 9291 021 0121 Washer 5.3 (46.2001)
32 ? 9022 341 0980 Spline screw IS M5x16 (46.2001)
33 9022 371 1020 Spline screw IS M5x20
4203 007 1050 Set of gaskets
Rewind starter, Muffler:
1 4223 195 0600 Starter cup
2 9210 261 1140 Hexagon nut M8x1
3 4203 190 0405 Starter cover with rewind starter
4 4203 190 0406 Starter cover
5 1110 084 9102 Bushing
6 9443 825 7130 Hollow rivet 7.5x1x6.8
7 0000 190 3401 Starter grip ElastoStart
8 1113 195 8200 Starter rope Ø 3.5x960mm
0000 930 2203 Starter rope Ø 3.5mm x 30.5m (B)
9 1118 190 0600 Rewind spring
10 4119 195 0400 Rope rotor
11 4116 195 7200 Pawl
12 0000 958 0923 Washer
13 1118 195 3500 Spring
14 9022 341 1050 Spline screw IS M5x25
15 4203 967 1506 Model plate BR 420
15 4203 967 1510 Model plate BR 420 C
16 1115 149 0600 Exhaust gasket
17 4203 140 0601 Muffler Europa
17 4203 140 0602 Muffler USA, CDN, AUS
18 4203 140 0604 Muffler, Cat.
19 9022 341 0980 Spline screw IS M5x16
20 4203 141 9005 Screen USA, CDN, AUS
21 4203 141 6600 Clip USA, CDN, AUS
Air filter, Ignition system:
# 4203 140 2805 Filter housing
2 9022 341 1220 Spline screw IS M5x48
3 9022 341 0980 Spline screw IS M5x16
4 4134 123 7500 Grommet
5 0000 989 0516 Grommet
6 1110 141 8600 Hose 135mm / 5 3/8''
4203 007 1028 Air filter kit USA (B)
7 4203 141 0301 Air filter
8 4203 120 1500 Prefilter
9 4203 140 1001 Filter cover
10 4128 141 8000 Screw plug
11 4203 129 0900 Gasket
14 4203 120 0604 Carburetor HD-29
14 4203 120 0608 Carburetor HD-28A USA (BR420 C)
16 4203 182 9501 Choke knob
18 9022 341 1050 Spline screw IS M5x25
20 4203 120 2200 Flange
21 4203 129 0901 Gasket
22 4203 122 1600 Heat shield
23 4203 400 1200 Flywheel
24 9210 261 1140 Hexagon nut M8x1
25 4203 400 1302 Ignition module
26 Ignition lead 350mm
0000 405 0600 Ignition lead 1m (B)
0000 930 2251 Ignition lead 10m (B)
27 ? 4203 400 1301 1 Ignition module * 2 49 904 356 (19.2001)
28 ? Ignition lead 270mm * 2 49 904 356 (19.2001)
? 0000 405 0600 Ignition lead 1m (B) * 2 49 904 356 (19.2001)
29 0751 030 8415 Spade terminal 6.3
30 9022 341 1019 Spline screw IS M5x20
31 0000 989 0602 Grommet
4203 007 1050 Set of gaskets
Carburetor HD-28A, HD-29:
# 4203 120 0604 Carburetor HD-29 )
# 4203 120 0608 Carburetor HD-28A USA )
1 4116 121 5100 Inlet needle
2 4116 122 3000 Spring
3 1113 121 9200 Spindle
4 4116 121 5000 Inlet control lever
5 1114 122 7400 Round head screw
6 4203 121 5400 Valve jet 0.52
7 4117 122 9402 Plug
8 4116 129 0901 Gasket
9 4116 121 4700 Metering diaphragm
10 4203 121 0802 End cover
11 1115 122 7100 Screw
12 1114 121 7800 Strainer
13 4116 121 4800 Pump diaphragm
14 4203 129 0902 Gasket
15 4203 121 0800 End cover
16 1114 122 7100 Screw
18 4117 122 6200 Idle speed adjustment screw
19 4116 120 7100 Throttle shaft with lever
20 4116 122 3200 Torsion spring
21 4116 121 3300 Throttle shutter
22 1115 122 7400 Round head screw
23 4116 122 5000 Spacer sleeve
24 4203 123 7300 Lever
25 1110 122 7400 Round head screw
26 4215 121 8600 Washer
27 4215 121 8900 Pin
28 1117 122 9000 E-clip
29 1116 122 3000 Spring
30 1116 122 4200 Ball
31 4203 121 3001 Choke shaft
32 4116 121 2900 Choke shutter
33 4117 122 3006 Spring
34 1128 122 3003 Spring
35 4203 122 6704 High speed adjustment screw
36 4203 122 6805 Low speed adjustment screw
37 4203 122 3600 Sealing ring
38 4203 122 6703 High speed adjustment screw USA
39 4203 122 6804 Low speed adjustment screw USA
40 4203 121 2700 Cap USA
41 5910 890 4500 Puller USA (B)
4116 007 1061 Set of carburetor parts
Fan housing:
# 4203 700 4103 Fan housing
2 4203 700 4104 Fan housing (BR420 C)
3 9443 825 7130 Hollow rivet 7.5x1x6.8
4 9074 478 4545 Pan head self-tapping screw IS P6x26.5
5 9022 371 1020 Spline screw IS M5x20
6 4203 700 3401 Fanwheel
8 9022 341 0980 Spline screw IS M5x16
9 4203 701 0701 Fan housing, outer
10 0000 706 4100 Cap
11 4203 706 2102 Shroud
15 9074 478 4425 Pan head self-tapping screw IS P6x19
16 4203 791 0300 Handle
17 9022 313 1120 Spline screw IS M5x58
18 9212 421 0700 Lock nut M5
19 4203 182 2107 Support
Backplate:
# 4203 701 1800 Backplate
2 4203 706 1100 Bracket
3 4203 708 0800 Spring
4 9074 478 4475 Pan head self-tapping screw IS P6x21.5
5 9074 478 4425 Pan head self-tapping screw IS P6x19
6 4203 790 8001 Back rest pad
7 ? 4203 790 8000 Back rest pad (06.2003)
8 ? 4203 790 8005 Back rest pad (B) (06.2003)
9 ? 4203 710 9100 Lap belt (B) (06.2003)
10 0751 030 7651 Rivet 5.9x17
11 4203 710 9000 Harness
12 4203 007 1002 Harness buckle
13 9408 021 4530 Rivet shank 4x8x6
14 9409 021 4420 Rivet head 4x8
15 4203 710 6900 Hook with webbing
16 4203 791 4600 Hook
17 4203 350 0402 Fuel tank
18 0000 989 0516 Grommet
19 4203 350 7600 Hose
20 4203 350 5801 Tank vent
21 4223 353 9201 Grommet
22 4205 122 2500 Hose clip
23 0000 350 3502 Pickup body
24 4223 350 0500 Filler cap
25 9645 948 4050 O-ring 36x3
26 0000 350 0900 Rope
27 4119 890 3400 Combination wrench
28 0000 890 2300 Screwdriver
28 0000 890 2305 Screwdriver available in Brazil only
29 0000 967 3701 Warning pictogram BR
30 4203 760 8100 Protective screen (B)
Pleated hose, Blower tube:
# 4203 701 6101 Pleated hose
2 ? 4203 701 6102 Pleated hose (46.2001)
3 4203 700 7100 Hose clip
4 4203 708 8201 Bracket
5 9074 478 4425 Pan head self-tapping screw IS P6x19
6 4203 701 6300 Slip ring
7 4203 708 6901 Elbow
8 4203 708 3404 Blower tube
9 ? 4203 708 3402 Blower tube (46.2001)
10 ? 4203 708 3400 Blower tube (46.2001)
11 4203 708 6306 Nozzle
4203 007 1031 Conversion kit
12 4203 708 6300 Nozzle
13 4203 701 8300 Nozzle (B)
14 4203 708 3408 Blower tube
Throttle control handle:
# 4203 790 1306 Control handle
1 4203 790 1104 Handle molding, inner 80mm / 3 3/16''
2 ? 4203 790 1103 Handle molding, inner 66.6mm / 2 5/8
3 4203 182 2900 Locking lever
4 4203 182 8902 Pin
5 9291 021 3863 Washer 6.1x21x1.4
6 9322 630 0715 Spring washer 6.2x19x1.2
7 9460 624 0502 E-clip 4
8 4203 791 0810 Handle molding, outer 80mm
9 ? 4203 791 0808 Handle molding, outer 66.6mm (1,2,3) (46.2001)
10 4203 182 1002 Throttle trigger
11 4203 430 0101 Slide
12 Contact spring (D)
13 4203 182 4500 Torsion spring
14 4203 791 5200 Bushing
15 4203 180 1104 Throttle cable
4203 440 1102 Short circuit wire
16 Short circuit wire (D)
17 Short circuit wire (D)
0751 010 1110 Lead 10m / 33' (B)
18 0751 030 8207 Terminal socket 4-1
19 0751 030 8404 Terminal socket 6.3-1
20 Terminal socket 4.8-1/0.8 (D)
21 Hose 780mm / 30 3/4''
4203 711 7201 Hose 960mm / 37 13/16''
22 4203 711 7203 Hose 160mm / 6 5/16''
23 9074 478 3075 Pan head self-tapping screw IS P4x19
24 9074 478 4425 Pan head self-tapping screw IS P6x19
Vacuum attachement:
# 4203 007 1003 Vacuum attachment (B)
1 4203 708 8900 Ring 80 (B)
2 4203 700 6301 Nozzle (B)
3 4203 500 7000 Diverter flap (B)
4 9460 624 0800 E-clip 8 (B)
5 4203 708 9300 Washer (B)
6 1 Lever (B,D)
7 9052 319 0870 Flat head screw M5x14 (B)
8 4203 708 9201 Catch (B)
9 4203 708 7900 Slide (B)
10 9052 319 0670 Flat head screw M4x15 (B)
11 4203 708 9601 Connector (B)
12 4203 708 9700 Catcher bag (B)
13 4203 708 9000 Adapter sleeve (B)
14 9771 021 3220 Hose clip 77x12 (B)
Conversion kit BR/SR:
# 4203 007 1030 Conversion kit BR/SR
1 4203 701 6102 Pleated hose
2 4203 791 9100 Spacer
4203 007 1001 Conversion kit
3 4203 700 7100 Hose clip
4 4203 708 8201 Bracket
5 9074 478 4425 Pan head self-tapping screw IS P6x19
6 4203 708 8700 Hose clip
7 4203 700 4500 Shut-off cock
8 9074 478 4545 Pan head self-tapping screw IS P6x26.5
9 4203 708 3405 Tube
10 4203 700 6310 Standard nozzle
11 4203 708 4001 Dosage unit
12 Hose 440mm / 17 3/8''
13 Hose 730mm / 28 3/4''
4202 708 9502 Hose 10x2x830mm
14 4203 358 7400 Reducer
15 0000 359 1205 Sealing ring
16 4203 708 3100 Union nut
17 9771 021 0780 Hose clip
18 4203 708 6600 Double baffle screen
19 4203 708 6700 Tapered screen
20 4203 708 6800 Baffle screen
21 4203 700 0800 Container
22 4203 700 0902 Container cap
23 4203 709 2000 Sealing ring
24 4203 700 8810 Strainer
25 4203 703 5700 Vent insert
26 Hose 330mm / 13''
4202 708 9502 Hose 10x2x830mm
27 9645 945 7700 O-ring 23.4x3.53
28 4203 350 8000 Reducer
29 9771 021 2640 Hose clip 38x12
30 4203 701 6200 Bellows
31 9771 021 2600 Hose clip 34x12
32 4203 791 5600 Support frame
33 4203 703 6901 Bracket