Technical Information · issue 7 of 1998
TS 510, TS 760: Carburetor HS 280 A, HS 281 A; cyl
IssueTI 7/1998
Part changes (1)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4205 120 0601 | 4205 120 0602 | Carburetor 4205 120 0601 (type HS 277 A) is replaced by version 4205 120 0602 (type HS 280 A) in model TS 510 and by version 4205 120 0603 (type HS 281 A) in model TS 760. |
Full text
Page 1 of 5
Technical Information
07.98
Cut-off machines STIHL TS 510, 760 – type 4205
Contents
1. Carburetor HS 280 A, HS 281 A
2. Cylinder with piston, cover, plug
3. Muffler
Compliance with EPA regulations (see TI 27.97) is achieved with the modifications described below.
The factory applies the label shown below to all machines that conform to the latest standard.
Andreas Stihl IMPORTANT ENGINE INFORMATION
ENGINE FAMILY: A8XS. R ; Type: ; DISPL.: CC;M.D.:
THIS ENGINE CONFORMS TO U.S. EPA PHASE 1 EMISSION REGULATIONS
000TI013 KN
FOR ULGE´s. REFER TO OWNER´S MANUAL FOR MAINTENANCE
SPECIFICATIONS AND ADJUSTMENT. 967 34
1. Carburetor
Carburetor 4205 120 0601 (type HS 277 A)
is replaced by version 4205 120 0602 (type
HS 280 A) in model TS 510 and by version
4205 120 0603 (type HS 281 A) in model TS 760.
The adjustment range of the high and low speed
adjusting screws is limited in the new carburetors.
4
1.1 New carburetor parts / function 2
1
1 Caps
- To limit the adjustment range of the high
and low speed adjusting screws
2 High speed adjusting screw
- Knurled head, to lock the cap
3 Low speed adjusting screw
- Knurled head, to lock the cap
4 Module with locating holes 3
328TI020 KN
- Integrally moulded cams (arrows) act as
stops for the tabs in the caps 1
)MTKVU=J=O
1.2 Standard setting
The carburetor is set at the factory to provide an
optimum fuel-air mixture under all operating
conditions. It ensures that the machine will run H
smoothly, be fuel efficient, operate reliably and 1/2
produce low emissions.
H L
1/4
The setting is identical to the standard setting
LA L
described in the chapter entitled "Carburetor
adjustment" in the Owner’s Manual:
H = 1/2 open
328TI021 KN
L = 1/4 open
as seen from the lean setting in each case!
The setting can only be corrected by up to 180°. 180°
This makes it possible to set a leaner mixture if
necessary when working at higher altitudes and
prevents the mixture from becoming too rich and
exceeding the emission standards laid down by
the EPA.
Correction of carburetor setting for higher fo
328TI022 KN
altitudes
If the engine runs unsatisfactorily, slight
readjustment may be necessary: 180°
• Check standard setting
• Warm up the engine
• Turn the high speed adjusting screw (H)
clockwise (leaner)
! If you make the setting too lean, the engine
might be damaged as a result of insufficient
lubrication and overheating.
1.3 Repair / Maintenance / Basic setting
The caps have to be removed to replace the
adjusting screws or clean the carburetor.
Use puller 5910 890 4500 for this purpose.
• Screw the puller into cap counterclockwise
until cap comes off
! The caps are damaged during the
disassembly process and must not be used
again.
328TI023 KN
1.3.1 Basic setting (without caps)
The basic setting is made after refitting the
adjusting screws:
With the adjusting screws hard against their seats -
H = back off 1 turn
L = back off 1 turn
)MTKVU=J=P
Then fit and secure new caps as described below:
• Insert caps in holes as illustrated - ensure the
tabs are positioned correctly - see arrows in
diagram!
• Press caps onto adjusting screws until they are
flush with the edge of the module
The position of the caps (and adjusting screws)
now corresponds exactly with the standard setting
328TI024 KN
(see 1.2.).
1.3.2 Set idle speed
• Set engine speed to 1800 rpm with the idle
speed screw (LA)
! Use a tachometer!
1.4 Fuel (mixing ratio)
The EPA permit was obtained with a fuel-oil mixing
ratio of 50:1.
See also TI 27.97! fo
1.5 Federal Emission Control Systems Utility Engines
See TI 27.97!
1 4 2 3
6 10
7
328TI025 KN
9
)MTKVU=J=Q
1.6 Summary
Item Part name Original New Remarks
version version
Carburetor HS 277 A; 4205 120 0601 --- 1)
Carburetor HS 280 A (for TS 510 "EPA"); --- 4205 120 0602
Carburetor HS 281 A (for TS 760 "EPA"); --- 4205 120 0603
each including:
1 Inlet needle 1110 121 5100 4116 121 5100
2 Inlet control lever 1110 121 5000 1124 121 5000
3 Valve jet 1111 121 5400 4221 121 5400
4 Fixed jet 0.64 --- 4205 121 5600
5 Spring 1110 122 3030 4205 122 3000
6 High speed adjusting screw 4205 122 6700 4205 122 6701
7 Cap --- 1124 121 2700
8 Low speed adjusting screw 4205 122 6800 4205 122 6801
9 Throttle shaft with lever 4221 120 7100 4221 120 7101
Other parts as before
10 Puller (special tool) --- 5910 890 4500
Modification to be introduced continuously
Remarks
1) Original version of part remains available for machines without EPA permit
2. Cylinder with piston, cover, plug
2.1 Cylinder
The combustion process has been optimized as a
result of modifications in the combustion chamber
and overflow ducts in the cylinders.
These changes help to reduce pollutant emissions
and ensure compliance with the exhaust emission
standards.
The displacement, bore, stroke and mounting
dimensions of the cylinders remain unchanged.
The max. engine rating of "EPA" machines is as
follows:
3.9 kW (5.3 bhp) for TS 510
4.35 kW (5.8 bhp) for TS 760
2.2 Cover, plug
1
The cover 4205 084 1600 (1) is used to cover the
gap in the shroud around the spark plug terminal.
One of the two openings (arrows) in the shroud
remains unused, since the decompression valve
is located in different positions in the TS 510 and
TS 760 machines. The unused opening is sealed
328TI026 KN
by means of plug 4205 145 9000 (2).
2
)MTKVU=J=R
Summary
Item Part name Original New Remarks
version version
Cylinder with piston (TS 510); 1111 020 1200 --- 1)
Cylinder with piston (TS 760); 1111 020 1206 --- 1)
Cylinder with piston (TS 510 "EPA"); --- 4205 020 1201
Cylinder with piston (TS 760 "EPA"); --- 4205 020 1200
including the same parts as before
1 Cover --- 4205 084 1600
2 Plug --- 4205 145 9000
Modification to be introduced continuously
Remarks
1) Original version of part remains available for machines without EPA permit
3. Muffler
The mufflers with spark arresting screen are
replaced by modified versions with additional
heat-conducting plate.
Summary
Item Part name Original New Remarks
version version
Muffler (TS 510); 1111 140 0609 --- 1)
Muffler (TS 760); 1111 140 0610 --- 1)
Muffler (TS 510 "EPA"); --- 4205 140 0601
Muffler (TS 760 "EPA"); --- 4205 140 0602
including the same parts as before
Modification to be introduced continuously
Remarks
1) Original version of part remains available for machines without EPA permit
Last Technical Information on series TS 760: 31.97 (TS 510, 760: 26.96)
1998 Andreas Stihl Andreas Stihl - D1/MTK-sc
Technical Documentation 6249 Page 2 of 5
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