Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Answer #1: Posted by Odin on June 27th, 2019 5:33 AM
Odin
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Member since:
April 10th, 2010 Points: 41,236,640
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
Handlebar
67
Stop Buffers
68
Buffers on
Machines with
Manual Fuel Pump 85
12.5 Carburetor
88
12.5.1 Leakage Test
89
RA_737_00_01_01
MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co. Control Levers
71
10.1 Master Control Lever 71
10.1.1 Removing and
Installing
71
10.2 Throttle Trigger/
Lockout Lever
72
10.3 Throttle Trigger/
Lockout Lever...
Instruction Manual - Page 3
...108
13. Special Servicing Tools 110
14. Servicing Aids
112
2
MS 231, MS 231 C, MS 251, MS 251 C Contents
12.6 Servicing
the Carburetor
90
12.6.1 Metering Diaphragm 90
12.6.2 Inlet Needle
90
12.6.3 Pump...Carburetor
95
12.7.1 Basic Setting
95
12.7.2 Standard setting
96
12.8 Carburetor Carrier 97
12.9 Intake Manifold
98
12.10 Tank Vent
99
12.10.1 Testing
99
12.10.2 Removing...
Instruction Manual - Page 7
...repair solution)
P 5x18
Cover, chain brake / engine housing
4.0
M 5
Filter base / baffle / carburetor
3.5
P 6x26.5 Handlebar / tank housing, right
6.0
M 5x16
Handlebar / tank housing, bottom
5.0...B
2), 3) 2)
1), 3) 1), 3)
1), 3) 2), 3) 4)
6
MS 231, MS 231 C, MS 251, MS 251 C
They can be removed and installed as often as necessary without impairing the strength of the screwed assembly...
Instruction Manual - Page 16
... spring in valve seat or cone
Remove and clean the inlet needle, clean the carburetor
Inlet needle worn
Replace the inlet needle
Inlet control lever sticking on spindle
Check the inlet control lever and replace if necessary. foreign matter in accelerator Install new carburetor pump worn or damaged
MS 231, MS 231 C, MS 251, MS 251 C
15
3.6 Carburetor
Condition Carburetor floods;
Instruction Manual - Page 28
...Remove the throttle trigger, b 10.3
2310RA053 TG
- Adjusting brake cable
- Loosen and lower the tank
TOP
housing, b 12.11.2
1
-
Check the brake cable (1) and retainer (2), replace if necessary
MS 231, MS 231 C, MS 251, MS 251...the set free travel .
1
1
- Remove the switch lever, b 10.3.1
2
- Remove the carburetor, b 12.5
- Turn adjusting screw counter- Turn adjusting screw...
Instruction Manual - Page 33
... port.
- Engine
2310RA071 TG
6.1 Muffler Always check and, if necessary, repair the fuel system, carburetor, air filter and ignition system before looking for faults on the cylinder.
32
MS 231, MS 231 C, MS 251, MS 251 C see instruction manual. Remove the shroud, b 6.4
Before removing the muffler, set the piston to top dead center to line it up on the...
Instruction Manual - Page 34
do not tighten down firmly.
- Remove the carburetor, b 12.5
-
Always perform the vacuum test first and then the pressure test.
Such faults allow supplementary air to top dead center. Remove the shroud, b 6.4
c
1
1... or cracks in place.
2310RA079 TG
a
2710RA164 TG 2310RA073 TG
MS 231, MS 231 C, MS 251, MS 251 C
33 Moreover, the transition from idle speed to part or full...
Instruction Manual - Page 35
...to no internal counterpressure. After finishing the test, push the ring to the left - Remove the flange 5910 855 4201 and sealing plate 0000 855 8106.
- Use a blunt tool...a vacuum of 0.5 bar.
Remove the flange 1118 850 4200 from the crankshaft during the piston's induction stroke because there is airtight.
34
MS 231, MS 231 C, MS 251, MS 251 C Install the carburetor, b 12.5
- Reassemble ...
Instruction Manual - Page 38
... cylinder. Remove the flywheel, b 7.6
- Remove the oil pump, b 11.3
- Remove the air guide shroud, b 12.4
2310RA092 TG
MS 231, MS 231 C, MS 251, MS 251 C
37 Remove the tank housing, b 12.11.5
2310RA089 TG
2310RA091 TG
: Use a drift (2) to be in the reverse sequence.
- Reassemble all other parts in perfect
condition. Remove the fan housing, b 8.2
- Remove the carburetor carrier...
Instruction Manual - Page 51
...be
2
about 0 Ω. If no fault can be
infinitely high. Remove the shroud, b 6.4
- Pull the carburetor towards the control handle - take care not to
1
"F".
2310RA133 TG
... 7.7 Short Circuit Wire
The ground and short circuit wires are in the air guide shroud.
50
MS 231, MS 231 C, MS 251, MS 251 C Reassemble in a wiring harness. Pull the switch lever off the spark plug.
2 1 ...
Instruction Manual - Page 72
... TG
- Check the filter base and replace
2
The positions of the Master Control
it and replace if necessary. Remove the air filter, b 12.1
- Reassemble all other parts in the
carburetor box.
- MS 231, MS 231 C, MS 251, MS 251 C
71 Remove the contact spring, b 7.7.4
1
2310RA162 TG
2
: Position the switch lever (1) in the reverse sequence.
2310RA163 TG
2
: Position the switch...
Instruction Manual - Page 78
... direction of the rear handle.
1
2
: Fit the new fuel hose (1). MS 231, MS 231 C, MS 251, MS 251 C
77 Models with fuel hose still attached to one side.
1
2
: Pass the throttle cable (1) between tank and engine housings and through the opening (arrow) in the direction of the carburetor carrier (2).
: Push the throttle rod (1) into position.
- Put the...
Instruction Manual - Page 84
... base to one side with the wiring harness still attached, b 12.3
- MS 231, MS 231 C, MS 251, MS 251 C
83 Remove the carburetor, b 12.5
- Put the wiring harness with STIHL press fluid to one ...check it to simplify installation, b 14
2310RA320 TG
: Take out the screws (1).
-
Remove the fan housing, b 8.2
- Remove the throttle rod, b 10.3.4
1
: Push the grommet (arrow) of the air...
Instruction Manual - Page 85
... ground wire (3) into the guides (arrows).
- Install the carburetor carrier, b 12.8
2310RA328 TG
2
- Install the carburetor, b 12.5
84
MS 231, MS 231 C, MS 251, MS 251 C Coat the grommet with wiring harness, b 12.3
- Install...seat.
1
: Insert and tighten down the screws (2) firmly.
- Remove the string.
: Line up grommet (1) of fuel hose (2) so that its straight side (arrow) butts...
Instruction Manual - Page 86
..., b 10.3.4
: Pull the fuel return hose (1) out of the cylinder and pull the air guide shroud away at the same time.
2310RA338 TG
MS 231, MS 231 C, MS 251, MS 251 C
85 Remove the carburetor carrier, b 12.8
2310RA335 TG
: Take out the screws (1).
: Push the manifold flange (1) out of the air guide shroud (2) in the direction of the...
Instruction Manual - Page 88
...fuel return hose.
- Install the carburetor, b 12.5
2310RA347 TG
:...Remove the string.
: Position the elbow connector (1) against the stop (arrow).
: Insert and tighten down the screw (2) firmly.
2
2
2
1
1
1
2310RA344 TG 2310RA346 TG 2310RA349 TG
2
: Line up grommet (1) of fuel hose (2) so that its straight side (arrow) butts against the manifold flange.
- MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 89
...12.3
- Install filter base with manual fuel pump - Make sure sealing ring (2) is in place.
1 2
2310RA199 TG
12.5 Carburetor
: Remove the fuel hose (1).
- Install a new fuel hose, b 12.11.2
2310RA353 TG
88
MS 231, MS 231 C, MS 251, MS 251 C
Reassemble all other parts in manifold flange.
- All models
1
- 2310RA286 TG
2 1
3
1
2310RA350 TG
: Push the rubber grommet...
Instruction Manual - Page 90
... the carburetor (1) over the studs (arrows) so that ends of inlet needle
is damaged or inlet control lever
is airtight. However, if it drops, there are flush with manual fuel pump
1
: Push the new fuel hose (1) onto the nipples (arrows).
2310RA356 TG
2310RA355 TG
2310RA354 TG 2310RA255 TG
- MS 231, MS 231 C, MS 251, MS 251 C
89...
Instruction Manual - Page 91
....
: Fit the screws (2) but do not tighten them very carefully.
2
3
: Carefully separate the metering diaphragm (1) and gasket (2). The diaphragm material is subjected to the carburetor, remove them down the screws firmly in the tabs.
90
MS 231, MS 231 C, MS 251, MS 251 C Remove the carburetor, b 12.5
21
21 2 2 2
2310RA256 TG 2310RA256 TG 2310RA260 TG
1
: Take out the screws (arrows...
Instruction Manual - Page 92
... end cover (2). Check that the inlet control lever moves freely.
- If the gasket and pump diaphragm are stuck to the carburetor, remove them very carefully.
2310RA265 TG
2310RA264 TG
1
2
: Remove the inlet needle (1).
: Remove the spring (2). MS 231, MS 231 C, MS 251, MS 251 C
91 Inspect and replace if necessary.
2310RA262 TG
: Position the inlet control lever (3) with the screw...
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