Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Question posted by Jtamme937 on July 9th, 2021
No Throttle
I just bought a stihl wood boss 251, back pack blower and tiller slash weed water. I've only used the chainsaw maybe an hour and the trigger won't throttle the engine anymore. Somethings missing I presume thats broken off but I don't know how to reattach the trigger.
Current Answers
Answer #1: Posted by SonuKumar on July 9th, 2021 9:36 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,618,310
Member since:
May 9th, 2021 Points: 16,618,310
How do you fix a trigger on a Stihl chainsaw?
Stihl MS180C Chainsaw Trigger Repair
Step 1: Remove the top cover. ...
Step 2: Open up the chainsaw handle. ...
Step 3: Remove the interlock spring. ...
Step 4: Remove the trigger. ...
Step 4: Fix your trigger (optional). ...
Step 5: Reconnect the throttle linkage. ...
Step 6: Reinstall the throttle trigger. ...
Step 7: Reassemble the handle.
What is throttle trigger lockout?
Throttle Trigger Lockout Lever: A lever on the top of the throttle handle which must be depressed before the throttle can be activated. When the operator releases the throttle trigger lockout lever, the throttle trigger will lock in the idle position.
What is Stihl master control lever?
Master Control LeverT82; is a single lever operating the choke, starting throttle lock and on-off switch. M. Rear Hand Guard reduces the risk of injury as well as provides a wide area for foot placement during starting.
Accept my hard work and happy weekend !!
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Answer #2: Posted by Odin on July 9th, 2021 9:36 AM
Odin
Member since:
April 10th, 2010 Points: 41,236,690
Member since:
April 10th, 2010 Points: 41,236,690
If it's "just bought," simply return it. Or exercise Stihl's warranty. doe information on the latter, use the contact information at https://www.contacthelp.com/stihl.
Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.
Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
Clutch side
36
Shroud
36
Engine
37
Cylinder / Crankshaft 38
...MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co.
Introduction and
Safety Precautions 3
1.1 Introduction
3
1.2 Safety Precautions
4
2.
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...
Instruction Manual - Page 3
...the Carburetor
90
12.6.1 Metering Diaphragm 90
12.6.2 Inlet Needle
90
12.6.3 Pump Diaphragm
91
12.6.4 Lever on
Throttle Shaft
92
12.6.5 Adjusting Screws
93
12.7 Adjusting
the Carburetor
95
12.7.1 Basic Setting
95
12.7.2 Standard ....11.4 Manual Fuel Pump 107
12.11.5 Tank Housing
108
13. Servicing Aids
112
2
MS 231, MS 231 C, MS 251, MS 251 C Special Servicing Tools 110
14.
Instruction Manual - Page 9
... Install new clutch drum
Saw chain rotates at idle speed
Engine idle speed too high Clutch springs stretched
Clutch springs broken
Readjust idle speed screw LA
Replace the clutch springs or... damaged Clutch shoe retainer broken Clutch shoes and carrier worn
Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch
8
MS 231, MS 231 C, MS 251, MS 251 C 3.
Instruction Manual - Page 10
...and operation of brake band
Saw chain rotates at idle speed
Engine idle speed too high Clutch springs stretched
Clutch springs broken
Readjust idle speed screw LA
Replace the clutch springs or ...is activated
Brake spring stretched or broken Fit new brake spring
Brake band stretched or worn Clutch drum worn
Fit new brake band Install new clutch drum
MS 231, MS 231 C, MS 251, MS 251 C
9
Instruction Manual - Page 11
... cable
Reconnect or replace brake cable Adjust brake cable
Adjust brake cable
10
MS 231, MS 231 C, MS 251, MS 251 C Condition
Cause
QuickStop Super Coasting brake does not disengage even though lockout lever is depressed
Brake cable stretched
Brake cable disconnected or broken
QuickStop Super Coasting brake does not disengage properly even though lockout lever is...
Instruction Manual - Page 13
...
Fit new starter rope
Starter rope does not rewind
Rewind spring very dirty or corroded Insufficient spring tension
Rewind spring broken
Clean or replace rewind spring
Check rewind spring and increase tension Fit new rewind spring
Starter rope cannot be pulled... worn
Install new carrier
Spring loop in spring housing fatigued Install new spring housing
12
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 17
... (counterclockwise)
Clutch springs stretched or fatigued Replace the clutch springs or install new clutch
Clutch spring hooks broken
Replace the clutch springs
16
MS 231, MS 231 C, MS 251, MS 251 C Condition
Cause
Remedy
Engine will not idle, idle speed too Throttle shutter opened too wide by Reset idle speed screw (LA)
high
idle speed screw (LA)
correctly
Oil...
Instruction Manual - Page 18
...Throttle shutter not opened fully Tank vent faulty
Check throttle rod Replace tank vent
Fuel pickup body dirty
Install new pickup body
Fuel strainer dirty
Clean fuel strainer in flywheel has sheared off
Install new flywheel
Engine...and choke shaft, service or replace if necessary
MS 231, MS 231 C, MS 251, MS 251 C
17 Condition
Cause
Engine speed drops quickly under Air filter dirty load ...
Instruction Manual - Page 19
...Engine does not deliver full power Piston rings worn or broken...in engine damaged at idle speed, but operates normally at full throttle
Engine pan...Engine does not start easily, stalls Oil seals in fan housing dirty
Clean air inlet on the engine:
- 3.7 Engine
Always 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...
Instruction Manual - Page 21
...must not rotate.
: Pry the brake band (2) out of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C
5.
the
chain must come to one of the chain braking time, i.e. the... which prolongs the braking time. With the chain brake released, open the
throttle wide for a brief
1
TOP
period (max. 3 seconds) - Starting the engine
2
1
- Disengage the chain brake
2
OP
1
: Turn the brake...
Instruction Manual - Page 28
Disconnect the brake spring,
b 5.4
1
- Remove the throttle trigger, b 10.3
2310RA053 TG
- Remove the carburetor, b 12.5
- Turn...(2), replace if necessary
MS 231, MS 231 C, MS 251, MS 251 C
27 clockwise to reduce free travel.
: When the setting is correct,
tighten down the lockout lever (1) and hold it .
- The brake band (1) must locate snugly against engine housing (arrows) and ...
Instruction Manual - Page 30
... brake cable, b 5.4.1
2310RA060 TG
2710RA079 TG
5.5 Chain Tensioner
2310RA066 TG
: Attach the brake cable (1) to the bore (arrow) in the guide (arrow).
- Install the throttle trigger, b 10.3
MS 231, MS 231 C, MS 251, MS 251 C
29 Install the switch lever, b 10.3.1
- Lift the tank housing and secure it in position, b 12.11.2
1
: Turn the spur gear (2) clockwise until...
Instruction Manual - Page 34
...vacuum test first and then the pressure test. Set the piston to part or full throttle is in castings are the usual causes of the prescribed idle speed difficult, if not... Such faults allow supplementary air to enter the engine and upset the fuel-air mixture.
The engine can be checked through the spark plug hole....MS 231, MS 231 C, MS 251, MS 251 C
33 This makes adjustment of leaks.
Instruction Manual - Page 62
... spring,
b 8.5
The system will not be under tension if the starter rope is broken. - MS 231, MS 231 C, MS 251, MS 251 C
61 Reassemble all other parts in the hub of the rope rotor is the anchor...
- Remove the spring clip and pawl(s), b 8.3
1
: Fit the rope rotor on the pawl(s) with STIHL special lubricant, b 14
Installing
- Take three full turns of the rope off the rope rotor.
1
2
...
Instruction Manual - Page 73
... molding, press the tabs (1) on the underside apart and push them through the rear handle.
1
: Take the throttle rod (1) out of its mounts (arrows).
: Attach the torsion spring (1) to drive out the
pin (1).
1
: Remove the throttle trigger (3)
2
: Remove the handle molding (1).
with torsion spring (4). note the installed position (arrow).
72
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 74
...Use a drift (2) to the lockout lever (arrow). The lockout lever may pop out.
2310RA173 TG
1
: To remove the handle molding, press the tabs (1) on throttle trigger turns freely, replace trigger...lockout lever (2) into its mounts (arrow).
2310RA172 TG
10.3 Throttle Trigger/Lockout Lever -
MS 231, MS 231 C, MS 251, MS 251 C
73 - QuickStop Super
Lubricate sliding and bearing points with ...
Instruction Manual - Page 75
... TG
2310RA180 TG
: Place the throttle trigger (1) in the rear handle so that the bent leg of handle molding (1) in the guide (arrow).
- Reassemble all other parts in the guide (arrows) or be below the drift - Check operation
- Push down .
: Lift the switch lever (1) a little, turn it if necessary
74
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 77
...switch lever (2) to "F",
hold it in the choke shaft (2).
2310RA193 TG
- Remove the throttle trigger,
b 10.2,
QuickStop Super, b 10.3
2310RA197 TG
1
: Engage the choke rod (1) ...2310RA196 TG
: Pull the short circuit wire (1) and ground wire (2) out of the buffer (2).
76
MS 231, MS 231 C, MS 251, MS 251 C Put the filter base to "F" and
ease the choke rod (2) out of the buffer (2).
2...
Instruction Manual - Page 78
...
2310RA298 TG
: Carefully pull the carburetor (1) off the studs - MS 231, MS 231 C, MS 251, MS 251 C
77 Models with fuel hose still attached to overstretch the fuel hose (2). All models
1
: Pass the throttle cable (1) through the opening (arrow) in the direction of the rear handle.
- Install the throttle trigger, b 10.2
1
1
2310RA294 TG
2310RA297 TG
2310RA199 TG
: Remove the...
Instruction Manual - Page 96
... 6600 may be replaced or after removing the limiter cap. Use the idle speed screw (LA) to set the engine speed again to 13,000 rpm. the ignition module limits maximum engine speed to 3,300 rpm.
4. this is the basic setting.
- MS 231, MS 231 C, MS 251, MS 251 C
95 12.7 Adjusting the Carburetor 12.7.1 Basic Setting
The basic...
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