Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Question posted by henryjg4 on July 1st, 2021
Stihl 251 Wont Start
My stihl 251 doesn't have many hours. I noticed when I couldn't start the chainsaw that when I turned the saw to check the gas that I was leaking gas out of the muffler. I took off the muffler and dried everything, put it back together, and it didn't leak anymore. However, I still cannot start the machine. Any ideas?
Current Answers
Answer #1: Posted by INIMITABLE on July 1st, 2021 4:35 PM
INIMITABLE
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April 3rd, 2020 Points: 2,088,520
Member since:
April 3rd, 2020 Points: 2,088,520
I hope this is helpful? PLEASE "ACCEPT" and mark it "HELPFUL" to complement my little effort. Hope to bring you more detailed answers
-INIMITABLE
Answer #2: Posted by SonuKumar on July 3rd, 2021 4:58 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,653,150
Member since:
May 9th, 2021 Points: 16,653,150
Why will my Stihl chainsaw not start?
The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel will evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting.
How do you fix a Stihl chainsaw that won't start?
Dirty or clogged fuel tanks, dirty fuel filters and lines, loose fuel hoses, dirty air filters and a dirty carburetor can all restrict fuel flow. Check, clean and replace all the fuel system parts before moving into the internal engine, as gas problems create a majority of starting problems.
https://www.youtube.com/watch?v=ea2uaodetPI
What would cause a chainsaw not to start?
The chainsaw's engine is flooded with fuel.
A fuel issue is one of the most common reasons why a chainsaw won't start. ... If you believe fuel has flooded the chainsaw engine, pull the starter cord several times while holding the throttle, dry and replace the spark plug, and then try starting the chainsaw again.
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
... 6.2.3 6.3 6.3.1 6.3.2 6.4 6.5 6.6 6.7 6.8 6.9
Muffler
32
Leakage Test
33
Preparations
33
Vacuum Test
34
Pressure Test...
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.
QuickStop Super
73
10.3.1 Switch Lever
QuickStop Super
74
10.3.2 Lockout Lever - Chain Brake
20
5.1 Checking Operation 20
5.2 Brake Band
20
...
Instruction Manual - Page 4
...on "Troubleshooting" and the "STIHL Service Training System" for the use of the illustrated parts lists while carrying out repair work.
MS 231, MS 231 C, MS 251, MS 251 C
3 You should make ... illustrations:
A Pointer
a Direction of movement
@ 4.2 =Reference to be passed to check the part numbers of the individual components and assemblies. Service manuals and all assemblies....
Instruction Manual - Page 5
...damage to a specific torque or coated with the aid of STIHL press fluid, b 14. there is started up in certain conditions. They can be explosive in the ... saw chain and guide bar before re-installing -
replace as the safety precautions and warnings in the instruction manual. The specifications must be identified by hand, to overheating.
4
MS 231, MS 231 C, MS 251, MS 251 ...
Instruction Manual - Page 19
...check and, if necessary, repair the following parts before looking for faults on fan housing
18
MS 231, MS 231 C, MS 251, MS 251 C Carburetor - Engine overheating
Insufficient cylinder cooling. Ignition system
Condition
Cause
Engine does not start...at full throttle
Engine pan leaking or damaged (cracks)
Intake...muffler (inlet and exhaust), replace spark arresting screen, replace muffler...
Instruction Manual - Page 21
...brake
2
OP
1
: Turn the brake band (1) to...4.1 - Starting the engine...Checking Operation
All models
The chain brake is in terms of the lockout lever on the chain saw chain coming to one of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C
the time that elapses between activating the brake and the saw . Troubleshooting, b 3.2
- 5. Install a new brake band if there are noticeable...
Instruction Manual - Page 31
...of the recess (arrows).
: Insert and tighten down until it lines up with
STIHL multipurpose grease, b 14
- Reassemble in the sprocket cover.
1
2
: ...out of the sprocket cover (1).
-
Clean all disassembled parts, b 14
- Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251 C 22
4
1
5.5.2 Chain Catcher
- Remove the chain sprocket cover.
165RA007...
Instruction Manual - Page 48
...check spark in the tester's window (2).
2310RA124 TG 2310RA126 TG
2 3
: Push short circuit wire (1) and ground wire (2) fully into the guides (arrows) and push the retainer (3) into the slot in the reverse sequence. The wiring harness is parallel to the spark plug.
1
4
High voltage - The engine may start...of ignition lead, see illustration. MS 231, MS 231 C, MS 251, MS 251 C
47 1 a
2
The ...
Instruction Manual - Page 49
..., MS 231 C, MS 251, MS 251 C Pull the boot off the ignition lead. Installing
165RA184 TG 165RA188 TG
23 4
- risk of electric shock.
: Use suitable pliers to pull the leg spring out of the spark plug boot with STIHL press fluid, b 14
: Hold the ignition lead and leg spring together and push them into the pierced...
Instruction Manual - Page 58
... and switch
shaft contact:
- Position "F" = no further action necessary
Engine runs? no
Install new ignition module b 7.3
yes
Machine runs trouble-free, no connection - MS 231, MS 231 C, MS 251, MS 251 C
no
- Short circuit wire chafed?
- Position "0" = connection
- Check position of stop switch:
- 2
3
Check operation
of flywheel on
crankshaft, b 6.2, b 7.6
57
Look for leaks -
Instruction Manual - Page 59
...Engage the segment (1) in the slots (arrows) in the reverse sequence.
58
MS 231, MS 231 C, MS 251, MS 251 C Clean all other side of the starter rope becomes very stiff and the ...arrows) and tighten them down firmly.
- Before installing, lubricate the rewind spring and starter post with STIHL special lubricant, b 14.
: Take out the screw (1) with sleeve and screws (arrows).
- Reassemble...
Instruction Manual - Page 62
...all other parts in rope rotor with STIHL special lubricant, b 14
Installing
- ...Check the rope rotor and replace if necessary.
- Install the starter rope, b 8.6
-
The recess in the hub of rewind spring
The system will not be relaxed.
: Carefully remove the rope rotor (2). - MS 231, MS 231 C, MS 251, MS 251... the rope rotor.
- Take three full turns of rewind spring,
b 8.5
The system...
Instruction Manual - Page 64
...a new spring.
: Starting at the anchor loop, apply suitable tool to rotate the rope rotor another full turn before maximum spring tension is... of the old rewind spring. the frame slips off one turn of STIHL special lubricant before installing, b 14
: Position the replacement ... is not the case, tension the spring by one additional turn.
-
Place a blanket over the work gloves to protect ...
Instruction Manual - Page 65
... without ErgoStart.
- Lubricate the replacement spring with frame with a few drops of STIHL special lubricant before installing, b 14
: Position the replacement spring with ErgoStart
If the...seat (arrow) in the fan housing.
2310RA230 TG
: Check the washer (1) and replace it in the reverse sequence.
64
MS 231, MS 231 C, MS 251, MS 251 C
The procedure is otherwise the same as an assembly ...
Instruction Manual - Page 69
...STIHL...parts in the reverse sequence.
: Screw the bearing plug (1) into the bores while turning them back and forth to the bearing plug (1).
: Push the stop buffers (1), tapered....
- Install new stop buffers (1) at both sides - Position the stop buffers.
68
MS 231, MS 231 C, MS 251, MS 251 C
Installing
3
21
Installing
2
2310RA244 TG 2310RA246 TG
5902RA251 TG
1
: Push the retainer...
Instruction Manual - Page 70
... the bores (arrows), turning them back and forth ... screw (1).
: Press the tank housing (2) down the screw (2) firmly.
- Use STIHL press fluid to simplify installation.
: Push the tank housing (1) upwards and hold it ...MS 231, MS 231 C, MS 251, MS 251 C
69 Remove the shroud, b 6.4
2310RA250 TG 2310RA252 TG
2310RA242 TG
1
: Push out the buffers (1) from the underside (arrows).
- Check...
Instruction Manual - Page 82
...starting more difficult. Remove the air filter, b 12.1
- Remove the switch shaft, b 10.1
-
Check the baffle and replace it if necessary
: Rotate the air filter (1) counterclockwise and lift it away.
- MS 231, MS 231 C, MS 251, MS 251...buffer (2).
- The air filter should be checked when there is a noticeable loss of engine power.
- Check the air filter and clean or replace if...
Instruction Manual - Page 83
...
2
- Use STIHL press fluid to press the short circuit wire (1) into the buffer (2) - Reassemble all other side of switch lever.
-
Check operation of the... the protective tube (3) locates below the guide rib.
- Position filter base in the reverse sequence.
82
MS 231, MS 231 C, MS 251, MS 251 C Fit the contact spring, b 7.7.4
2310RA317 TG
: Push the filter base (1) onto the
studs ...
Instruction Manual - Page 84
... wiring harness out of manifold flange.
- Pull out the shutter , check it to one side.
1
1
2 1
: Push the manifold ...long) around the back of the guides (arrows).
- MS 231, MS 231 C, MS 251, MS 251 C
83 12.4 Air Guide Shroud
- Pull the fuel... and put it and replace if necessary. Coat manifold flange with STIHL press fluid to one side with filter base to simplify installation, ...
Instruction Manual - Page 88
...MS 231, MS 231 C, MS 251, MS 251 C
87 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 seat.
: Insert and tighten down the screws (2) firmly.
: Starting...- Coat the grommet with STIHL press fluid to pull the...
Instruction Manual - Page 97
... far as stop .
Carry out standard setting.
- Warm up the engine.
- Saw chain runs while engine is usually necessary to the low speed screw (L). It is idling
-
Check standard setting.
- Even minor adjustments can noticeably affect engine running , then turn it back 1 full turn . Inspect the spark arresting screen (if fitted) and clean or replace...
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