Technical Information · issue 4 of 2001
Carburetor; Fan Housing; Throttle Cable / Throttle
Model BG 55, 65 Blowers and SH 55 Vacuum Shredder – Series 4229
IssueTI 4/2001
Part changes (1)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4229 120 0604 | 4229 120 0603 | Carburetor The previous carburetor 4229 120 0604 The new version of the carburetor has a limiter cap (BIS carb) will be replaced by carburetor on the high speed screw which is designed to limit 4229 120 0603 on BG 55 from serial number the range of adjustment. |
Full text
Page 1 of 7
Technical Information
04.2001
Model BG 55, 65 Blowers and SH 55 Vacuum Shredder – Series 4229
Contents
1. Carburetor
1.1 Construction
1.2 Function
1.3 Repairs / Servicing
1.4 Setting Instructions
2. Fan Housing
3. Throttle Cable / Throttle Rod
4. Handle Molding
5. Throttle Trigger
6. Spacer Flange
7. Filter Housing (Choke Lever)
8. Filter Cover
9. Filter
10. Screen / Vacuum Attachment
11. Star Nut (SH 55, SH 85 only)
1. Carburetor
The previous carburetor 4229 120 0604 The new version of the carburetor has a limiter cap
(BIS carb) will be replaced by carburetor on the high speed screw which is designed to limit
4229 120 0603 on BG 55 from serial number the range of adjustment. In addition, funnel-shaped
2 49 810 846 and BG 65 from serial no. caps are fitted on the low speed and idle speed
2 49 799 306. Other models in progress. screws to aid insertion of a screwdriver.
A throttle rod will be installed at the same time
to replace the throttle cable used up to now
(see chapter 3).
295TI001 KN
Left: Previous version
Right: New version
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)m~ge 2 Technical Information 04.2001
1.1 Construction 1.3 Repairs / Servicing
4 1
2
3
295TI014 KN
295TI011 KN
. Low speed screw (1) The limiter cap has to be removed from the high
speed screw in the service shop to replace the high
. High speed screw (2)
speed screw or clean the carburetor.
. Limiter cap for high speed screw (3)
. Use suitable pliers to pull off the cap.
. Stop pin (4)
Limiter caps that have been removed once must
not be used again. Always install a new cap.
1.3.1 Before adjustment after carburetor
servicing
. Check the air filter and clean or replace as
necessary.
. Check spark arresting screen and clean or
replace as necessary.
. Check the fuel filter and clean or replace as
295TI012 KN
necessary.
The limiter cap is pushed over the head of the high 1.3.2 Standard setting of H screw
speed screw and locked in position by the knurling
on the screw. The stop pin (see arrow) in the
carburetor body serves to limit adjustment.
H L
1.2 Function
295TI015 KN
270°
. Starting with the screw lightly against its seat:
Open high speed screw (H) 11/2 turns (with
limiter cap removed).
295TI013 KN
The cap and pin limit the range of adjustment of the
high speed screw to a maximum of 270 degrees.
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Technical Information 04.2001 Page 3
1.3.3 Installing the limiter cap 1.4 Setting Instructions
Always use a new cap. Caps that have been
removed once must not be re-used because they
might be damaged.
270°
295TI013 KN
The user may adjust the carburetor’s high speed
295TI016 KN
screw within a range of 270 degrees.
This enables the mixture to be made leaner, if
. Position cap for high speed screw (H) so necessary, when operating the machine at higher
that it is in line with “rich” stop (see arrow). altitudes.
. Push cap home as far as stop against The procedure for setting the carburetor is also
carburetor body. fo
described in the owner’s manual (see chapter
"Adjusting the Carburetor").
1.3.4 Adjusting idle speed
295TI017 KN
Starting with the screws lightly against their seats:
. Open low speed screw (L) one full turn
counterclockwise.
. Use idle speed screw (LA) to set engine speed
to 2,800 RPM.
This adjustment must be checked with a
tachometer.
1.3.5 Checking running behavior
. Open the throttle several times to check that
engine accelerates smoothly.
. Engine must run smoothly at idle speed.
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)m~ge 4 Technical Information 04.2001
2. Fan Housing 4. Handle Molding
295TI003 KN
295TI009 KN
Left: Previous version Left: Previous version
Right: New version Right: New version
The fan housing has been modified in the area of
Additional stiffeners have been included in the new
the carburetor adjusting screws (see arrow).
versions of the handle molding to provide extra
strength. The symbol for carburetor adjustment has
3. Throttle Cable / Throttle Rod fo
been deleted.
The modifications made to the fan housing with
rewind starter (chapter 2) and modified handle
molding (chapter 4) also required that a change be
made to the fan housing with fuel tank. The new
parts do not interchange with older components.
See summary for spare parts for older machines.
5. Throttle Trigger
sio 295TI008 KN
The previous throttle cable will be replaced by a
throttle rod. This necessitated changes to other
components (handle molding, throttle trigger,
spacer flange, see chapters 4. to 6.).
295TI018 KN
1 2
1 Previous version BG 55, BG 65, SH 55
2 New version BG 55, BG 65, SH 55
The throttle triggers have been modified to accept
the new throttle rod.
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Technical Information 04.2001 Page 5
6. Spacer Flange 8. Filter Cover
LA
1
H /4
3
295TI002 KN
295TI005 KN
Left: Previous version The symbols for carburetor adjustment will be
Right: New version applied to the filter cover (see arrows) to coincide
with the introduction of the new carburetor.
The spacer flange has been modified to accept the
9. Filter
new throttle rod and carburetor. The new spacer
flange has the part no. 4229 121 1601. The
previous flange remains available as a spare part for
older versions (see summary).
7. Filter Housing (Choke Lever)
Filter housing 4229 140 2801 will be installed in
place of the previous filter housing 4229 140 2800.
295TI004 KN
1 2 3
The previous two-part filter, consisting of the
filter element (1) and prefilter (2) will be available as
a one-piece element (3) 4229 120 1800 to further
simplify installation.
295TI006 KN
Left: Previous version
Right: New version
The new version of the filter housing is equipped
with a modified choke lever with an offset top end.
The modified choke lever allows easier access for
the choke function.
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)m~ge 6 Technical Information 04.2001
10. Screen / Vacuum Attachment
295TI010 KN
The screen now has two further improved “snap
hooks” arranged back to back. Additional ribs have
been included to provide extra rigidity. The part
number remains unchanged.
11. Star Nut (SH 55, SH 85 only)
On vacuum shredders, the star nut 4229 716 6700
will be used together with the collar screw
4229 716 6800 to secure the suction tube.
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Technical Information 04.2001 Page 7
Summary
Item Part Name Previous New Rem.
1 CarburetorC1Q-S55 (BG 55, 65, SH 55) 4229 120 0604 --- 1)
2 Carburetor C1Q-S64 (BG 55, 65, SH 55) --- 4229 120 0603
3 Spacer flange 4229 121 1600 4229 121 1601 1)
4 Fan housing with rewind starter
(BG 55, 65, SH 55); including item 5: 4229 080 2100 4229 080 2102 1)
5 Fan housing 4229 080 1800 4229 080 1801 1)
6 Air filter --- 4229 120 1800
7 Filter 4229 124 2800 --- 2)
8 Prefilter 4229 124 1500 --- 2)
9 Filter housing; 4229 140 2800 4229 140 2801 2)
including items 10 to 12:
10 Lever 4140 141 3700 4229 141 3700 1)
11 Choke shutter 4229 141 3800 4229 141 3800
12 Push nut 9417 003 7512 9417 003 7512
13 Filter cover 4229 141 0500 4229 141 0501 1)
14 Fan housing with fuel tank (BG 55, SH 55) 4229 700 4108 4229 700 4114 3)
15 Fan housing with fuel tank (BG 65)
fo 4229 700 4109 4229 700 4115 3)
16 Fan housing kit; including items 4, 14 and 18: --- 4229 700 4150 4)
17 Fan housing kit; including items 4, 15 and 19: --- 4229 700 4151 4)
18 Handle molding (BG 55, SH 55); 4229 790 0600 4229 790 0605 1)
19 Handle molding (BG 65) 4229 790 0601 4229 790 0607 1)
20 Throttle cable 4229 180 1101 --- 1)
21 Throttle rod --- 4229 182 1500
22 Throttle trigger (BG 55, 65, SH 55) 4229 182 1005 4229 182 1006 1)
23 Star nut --- 4229 716 6700
24 Collar screw 9074 487 4545 4229 716 6800 1)
All other parts as before
Modification to be introduced on BG 55 from serial number 2 49 810 846 and BG 65 from
serial no. 2 49 799 306. Other models in progress.
Remarks
1) Previous version of part remains available for older machines
2) Previous version of part will be supplied only as long as factory stocks last
3) Use items 16 and 17 respectively as spare parts for older machines
4) Spare part for older machines
Last Technical Information on models BG 55, BG 65, SH 55: 29.1999
© 2001 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTS 7205
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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.