Technical Information · issue 11 of 2010
Carburetor; Fuel Tank with 2 Pickup Bodies; Blowing Attachment; Chest Strap
IssueTI 11/2010
Full text
Page 1 of 12
STIH)
Technical Information 11.2010
STIHL BR 500, 550, 600 Blower – Series 4282
Contents
1. Carburetor
2. Fuel Tank with 2 Pickup Bodies
3. Blowing Attachment
4. Chest Strap
1. Carburetor
The following features distinguish the new
carburetors from the previous carburetors:
H – High speed screw (H) and low speed screw (L)
H L
now have hex heads.
– Narrow access to both screws, (H) and (L),
means that carburetor adjustments are possible
only in the service shop with a special servicing
tool.
– No limiter caps.
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The new carburetors can also be used on older
machines.
BR 500, BR 550 and BR 600 blowers will be
equipped with new carburetors in the future.
The new carburetors are tuned at the factory so the
engine receives an optimum fuel-air mixture in all
environments and operating conditions.
It is no longer possible for the user to make any
adjustments on the high speed screw (H) or low
speed screw (L).
The idle speed screw (LA) remains unchanged and
can be adjusted by the user as before to correct the
engine idle speed.
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)m~ge 2 Technical Information 11.2010
Overview
Application Designation of Part No. Designation Part No.
previous carburetor of previous of new carburetor of new carburetor
carburetor
BR 500 C1Q-S99A 4282 120 0603 C1Q-S183 4282 120 0606
BR 550 C1Q-S101A 4282 120 0605 C1Q-S185 4282 120 0608
BR 600 C1Q-S100A 4282 120 0604 C1Q-S184 4282 120 0607
1.1 Adjusting the Carburetor 1.1.2 Fine tuning
Adjustment of the carburetor high speed screw (H) . Check the air filter and replace if necessary.
and low speed screw (L) can only be performed in . The air filter must not be cleaned – always
the service shop. replace a dirty filter.
. Check the spark arresting screen and clean or
replace if necessary.
. Warm up the engine.
Adjusting idle speed
Adjust idle speed with the aid of a tachometer.
Adjust specified engine speeds within a tolerance of
± 200 rpm.
. Adjust engine speed with idle speed screw (LA)
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to 3,000 rpm.
. Turn the low speed screw (L) clockwise or
Special screwdriver 5910 890 2307 is required to counterclockwise to obtain the maximum engine
make the adjustments. speed.
1.1.1 Basic setting If this speed is higher than 3,400 rpm, abort the
procedure and start again from the beginning.
. Turn both adjusting screws clockwise until
lightly seated. . Use the idle speed screw (LA) to set the engine
speed again to 3,000 rpm.
. Set the engine speed to 2,500 rpm with the low
speed screw (L).
H L
H 3.5 L2
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Perform basic setting as follows:
. High speed screw H: Open 3 1/2 turns
counterclockwise
. Low speed screw L: Open 2 turns
counterclockwise
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Technical Information 11.2010 Page 3
Adjusting maximum engine speed
It is not possible to specify an exact maximum
engine speed because power is constantly
absorbed by the fanwheel.
. With the engine running at full throttle, turn the
high speed screw counterclockwise and use a
tachometer to set a 100 rpm drop in speed (rich
limit) compared to maximum engine speed.
. Turn the high speed screw 1full turn clockwise
(leaner) from that position.
If it is not possible to check engine speed with a
tachometer while making adjustments, do not set
the high speed screw any leaner by turning it
beyond the basic setting.
If the setting is too lean, there is a risk of engine
damage.
1.2 Summary
Item Part Name Previous New Rem.
1 C1Q-S99A carburetor; 4282 120 0603 --- 1)
including items 7, 10, 11:
2 C1Q-S183 carburetor; --- 4282 120 0606 3)
including items 7, 10:
3 C1Q-S100A carburetor; 4282 120 0604 --- 1)
including items 8, 10, 11:
4 C1Q-S184 carburetor; --- 4282 120 0607 3)
including items 8, 10:
5 C1Q-S101A carburetor; 4282 120 0605 --- 1)
including items 9, 10, 11:
6 C1Q-S185 carburetor; --- 4282 120 0608 3)
including items 9, 10:
7 High speed screw 4282 122 6700 4282 122 6705 2)
8 High speed screw 4282 122 6701 4282 122 6706 2)
9 High speed screw 4282 122 6702 4282 122 6707 2)
10 Low speed screw 4282 122 6800 4282 122 6801 2)
11 Cap 4229 121 2701 --- 2) 4)
12 Screwdriver --- 5910 890 2307
Modification to be introduced : in progress
Remarks
1) Previous version of part will be supplied from factory only as long as existing stocks last
2) Previous version of part remains available for older models
3) New version of part can also be used for older machines
4) Previous version of part remains available for other models
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2. Fuel Tank with 2 Pickup Bodies 2.1 Retrofitting previous fuel tank with a
second pickup body
Previous fuel tank 4282 350 0401 will be replaced
on all models by the new fuel tank 4282 350 0403. Previous fuel tank 4282 350 0400 cannot be
Starting serial number 2 81 136 629 modified.
The new fuel tank can also be installed in older The previous fuel tank 4282 350 0401 can be
machines. retrofitted with a second pickup body.
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The new fuel tank features 2 interconnected pickup
bodies positioned on the left half and right half side
of the fuel tank.
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. Check position of pickup body in the tank:
– Pickup body points to left – follow installation
instructions under 2.1.1
– Pickup body points to right – follow installation
instructions under 2.1.2
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This arrangement means fuel can be picked up by
at least one pickup body when the fuel level is low 1 2
and the tank is at an angle.
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. Cut 6.5 in (166 mm) length from 3.1x5.7 bulk
hose (2) 0000 930 2803 or 0712 923 8004.
. Connect new pickup body (1) 0000 350 3514 to
the hose (2).
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Technical Information 11.2010 Page 5
2.1.1 Installation instructions: Previous
pickup body positioned on left
4
3
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. Use hook (4) 5910 893 8800 to pull the previous
pickup body (3) out of the tank.
. Insert the pickup body (3), top first, through the
3 3 tank's filler opening.
. Insert the pickup body (1) connectors first
through the tank's filler opening. At the same
time, use the hook 5910 893 8800 to push the
pickup body (3) into the right half of the tank.
1 5
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. Remove the previous pickup body (3) from the
molded hose (5).
. Install the second connector of the pickup
body (1) onto the molded hose (5).
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. Connect the previous pickup body (3) to the
other end of the hose.
. Check positions of pickup bodies in the fuel tank
– they should be as shown in the illustration.
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2.1.2 Installation instructions: Previous 3. Blowing Attachment
pickup body positioned on right
BR 500, BR 550 and BR 600 blowers are now
equipped with a new blowing attachment.
3
Differences between new blowing attachment and
previous blowing attachment:
– Starting serial number 2 81 158 115: Alignment
1 marks on hose clamps, elbow and blower tube.
– Starting serial number 2 81 158 115: Longer
screws on hose clamps and control handle.
– New, modified nozzles.
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. Insert the pickup body (1), top first, through the
tank's filler opening.
. Insert the pickup body (3) connector first,
through the tank's filler opening. At the same
time, use the hook 5910 893 8800 to push the
pickup body (1) into the right half of the tank.
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. Check positions of pickup bodies in the fuel tank
– they should be as shown in the illustration.
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Technical Information 11.2010 Page 7
3.1 Alignment marks on hose clamps, elbow 3.3 New nozzles
and blower tube Nozzles are gradually worn during operation as a
The elbow, hose clamps and blower tube will have result of ground contact. On previous nozzles the
alignment marks to simplify assembly of the blowing wear caused an increase in the outlet cross section
attachment. which reduced blower performance.
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The marks ensure correct assembly of the parts – as Top: Previous nozzle
shown in the illustration. This change has no Bottom: New nozzle
influence on the availability of spare parts. The new
versions of parts can also be used for older The outlets of the new nozzles are equipped with an
machines. cylindrical extension which retains the same cross
section as it wears. Blower performance thus
3.2 Mounting screws remains constant until the wear mark is reached.
The new nozzles are therefore longer than the
The previous screw for mounting the hose clamps
previous nozzles.
and control handle has been replaced by a new
screw that is 0.2 in (5 mm) longer.
The longer screw cannot be used on older machines Wear mark
unless the optimized hose clamps or control handle
is used.
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The nozzle is subject to normal wear and tear and
must be replaced when the wear mark is reached.
Left: Previous screw 9074 478 4475
Right: New screw 9074 478 4545
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3.4 New blower tubes
The following features distinguish the new blower
tubes from the previous blower tubes:
Blower tubes for BR 500, BR 550 and BR 600:
. Label with instructions on length adjustment
Blower tube for BR 550 and BR 600:
. Shorter – no change in overall length of blowing
attachment when used with the new nozzles.
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Top: Previous blower tube for BR 550,
BR 600
Bottom: New blower tube for BR 550, BR 600
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Technical Information 11.2010 Page 9
3.5 BR 500 parts availability
2 5
1, 9 10
3 6
1, 9 10 4 7
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Summary
Item Part Name Previous New Rem.
1 Blower tube silencer 4282 701 9205 4282 780 8200 1)
2 Round nozzle 4282 708 6300 --- 2)
3 Round nozzle 4282 708 6310 --- 2)
4 Round nozzle --- 4282 708 6370
5 Curved nozzle 4282 708 6320 --- 2)
6 Curved nozzle 4282 708 6330 --- 2)
7 Curved nozzle --- 4282 708 6375
Conductive blowing attachment (special accessory)
8 Blower tube kit, including items 4, 9,10 4282 007 1012 4282 007 1012 3) 4)
9 Blower tube silencer 4282 701 9202 4282 780 8201 1)
10 Antistatic wire 4282 740 7103 4282 740 7103
Modification to be introduced : starting serial number 2 82 000 000
Remarks
1) Previous version of part no longer available from factory
2) Previous version of part remains available for older models
3) Only modified version of part is available from factory
4) New version of part can also be used for older machines
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3.6 BR 550 parts availability
2
1, 5 6
2
1, 5 6
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3
Summary
Item Part Name Previous New Rem.
1 Blower Tube 4282 701 5401 4282 700 1800 1)
2 Round nozzle 4282 708 6300 4282 708 6360 2)
3 Curved nozzle 4282 708 6320 4282 708 6365 2)
Conductive blowing attachment (special accessory)
4 Blower tube kit, including items 2, 5, 6 4282 007 1017 4282 007 1017 3) 4)
5 Blower tube 4282 701 5403 4282 700 1801 1)
6 Antistatic wire 4282 740 7103 4282 740 7104 2)
Modification to be introduced : starting serial number 2 80 525 705
Remarks
1) Previous version of part no longer available from factory
2) Previous version of part remains available for older models
3) Only modified version of part is available from factory
4) New version of part can also be used for older machines
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Technical Information 11.2010 Page 11
3.7 BR 600 parts availability
2
1, 5 6
2
1, 5 6
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3
Summary
Item Part Name Previous New Rem.
1 Blower tube 4282 701 5401 4282 700 1800 1)
2 Round nozzle 4282 708 6310 4282 708 6350 2)
3 Curved nozzle 4282 708 6330 4282 708 6355 2)
Conductive blowing attachment (special accessory)
4 Blower tube kit, including items 2, 5, 6 4282 007 1013 4282 007 1013 3) 4)
5 Blower tube 4282 701 5403 4282 700 1801 1)
6 Antistatic wire 4282 740 7103 4282 740 7104 2)
Modification to be introduced : starting serial number 2 80 525 705
Remarks
1) Previous version of part no longer available from factory
2) Previous version of part remains available for older models
3) Only modified version of part is available from factory
4) New version of part can also be used for older machines
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3.8 Installing antistatic wire
2 1 3
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. Engage the antistatic wire (1) in the slot at the
outlet end of the blower tube (2).
. Push the nozzle (3) over the blower tube (2) and
engage it in position.
4. Chest Strap
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A chest strap can be attached to the shoulder
straps. The chest strap holds the shoulder straps in
position and thus improves wear comfort.
The chest strap 0000 790 7700 is available as a
special accessory.
© ANDREAS STIHL AG & Co. KG, 2010 Technical Documentation
D1/MTK-ni
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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.