Stihl MS 171 Support Question
Stihl MS 171 Support Question
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Answer #1: Posted by SonuKumar on June 5th, 2021 9:24 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,653,150
Member since:
May 9th, 2021 Points: 16,653,150
https://assets.unilogcorp.com/187/ITEM/DOC/STIHL_100139362_Instruction_Installation_Manual.pdf
To test the Stihl MS 171 ignition coil, disconnect the ignition switch wire at the ignition coil. Using a good quality spark tester, pull the starter rope with a good fast pull and check for spark. Removing the spark plug makes this process easier since it reduces the resistance when pulling the starter rope.
Check to be sure the wires leading to the "On-Off" switch aren't tangled or touching a metal point on the engine if there is no spark, advises the Garden Grapevine website. Replace any wires if they are damaged or corroded.
If there is no spark during this process, the problem is most likely a defective ignition coil. Remove the screws that hold the outer housing of the chain saw in place. Remove the housing to access the ignition coil. The ignition coil is located next to the carburetor.
https://www.youtube.com/watch?v=FrTyFSksE7Q
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Related Stihl MS 171 Manual Pages
Product Instruction Manual - Page 3
... 0458-533-8621-B.
Careless or improper use may cause serious or even fatal injury.
{
MS 171, MS 181, MS 181 C, MS 211, MS 211 C
1
© ANDREAS STIHL AG & Co. M10.B11.CP. 0000000877_009_GB Contact ...41
Adjusting the Carburetor
41
Spark Plug
42
Engine Running Behavior
43
Replacing the Starter Rope and
Rewind Spring
43
Storing the Machine
47
Checking and Replacing the Chain
...
Product Instruction Manual - Page 6
... on a regular or sustained basis.
- A power tool with loose components or with damaged or worn AV elements will tend to have their hearing checked regularly.
4
MS 171, MS 181, MS 181 C, MS 211, MS 211 C Take frequent breaks. Warning! Wear sound barriers (ear plugs or ear mufflers) to help protect your hearing.
All factors which are available...
Product Instruction Manual - Page 7
...screen over longer distances.
If spilled and ignited by a spark or other personal injury from saw chain moving. Always shut ... cool before refueling.
heavy impact or a fall), always check that you .
Use extreme caution when handling gasoline or ... release slowly.
Do not smoke or bring any way. MS 171, MS 181, MS 181 C, MS 211, MS 211 C
5 To reduce the risk of doubt, have...
Product Instruction Manual - Page 9
... end of the chain is securely mounted on the spark plug - Warning! a loose boot may cause arcing that the spark plug boot is extremely important. STIHL Oilomatic chain, guide...methods reduce the risk of the instruction manual.)
Warning!
MS 171, MS 181, MS 181 C, MS 211, MS 211 C
7 Always check your saw kickback standard" below. Check that could ignite combustible fumes and cause a fire. ...
Product Instruction Manual - Page 35
Accelerate up to the spark plug, 45° counterclockwise.
1 Winter operation 2 Summer operation N Install the shroud - the chain ... and maintained regularly by trained personnel, such as your saw is now drawn in any way. MS 171, MS 181, MS 181 C, MS 211, MS 211 C
33 felling cut.
Check operation of chain brake
Before starting work: Run engine at the following intervals:
Full-time usage...
Product Instruction Manual - Page 43
...moving when the engine is too lean -
Fine tuning for operation at high altitude
MS 171, MS 181, MS 181 C, MS 211, MS 211 C
41
N Turn the idle speed screw (LA) counterclockwise until the chain...clockwise as far as stop , then turn it back 1 turn it off the engine. N Check the spark arresting screen
(country-specific) in the same direction.
N Idle setting is only possible to run...
Product Instruction Manual - Page 44
.... N Turn high speed screw (H) slightly
clockwise (leaner) - Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. N Check electrode gap (A) and
readjust if necessary - Too much engine oil in operation.
A
N Clean dirty spark plug. N Unscrew the spark plug.
42
MS 171, MS 181, MS 181 C, MS 211, MS 211 C N Warm up the engine.
Product Instruction Manual - Page 45
... nut, it down firmly) -
MS 171, MS 181, MS 181 C, MS 211, MS 211 C
43 Installing the spark plug
N Install the spark plug and connect the spark plug boot (press it must be attached.) A loose connection between spark plug boot and ignition wire connector in the reverse sequence.
1
1
N Remove the shroud -
see "Shroud".
Have the muffler checked for contamination (carbonization) by...
Product Instruction Manual - Page 54
English
Inspections and Maintenance by an authorized STIHL servicing dealer.
52
MS 171, MS 181, MS 181 C, MS 211, MS 211 C STIHL recommends that you have servicing and repair work carried out exclusively by Dealer
Spark Arresting Screen in Muffler
Spark arresting screen in muffler (not all markets) N If the engine is down on power,
check the spark arresting screen in the muffler.
Product Instruction Manual - Page 56
...MS 171, MS 181, MS 181 C, MS 211, MS 211 C If your daily working time is longer or operating conditions are difficult (very dusty work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required
Cooling inlets
Clean
X
Cylinder fins
Clean
X
X
Carburetor
Check...) Spark arresting screen in muffler (not all markets)
Clean, replace if necessary1)
Check
...
User Guide - Page 2
...171, MS 181, MS 211
q
© ANDREAS STIHL AG & Co. Engine
28 11.
Clutch
19
Installing
45
9.6.3 Ground Wire
47
6.1 Clutch Drum
21 9.6.4 Contact Spring
47
9.7 Ignition System
Troubleshooting
49
7. Chain Brake
22
7.1 Checking...71
5. KG, 2007
1
Contents
1.
Cutting Attachment 18 9.4 Spark Plug Boot
43
9.5 Flywheel
44
5.1 Chain Catcher
18 9.6 Short Circuit Wire
45
9.6.1 ...
User Guide - Page 13
... voltages which occur can also be the reason for erratic running behavior.
12
MS 171, MS 181, MS 211 Check ignition lead/ignition module and replace ignition module if necessary. too much oil
... have turned blue
Irregular spark
Check operation of power
Cause
Remedy
Spark plug boot is loose
Press boot firmly onto spark plug and fit new spring if necessary
Spark plug sooted, smeared with...
User Guide - Page 14
Condition No spark
Cause
Remedy
Spark plug faulty
Install new spark plug
Faulty insulation or short in short circuit wire
Check short circuit wire for short circuit to ground
Break in ignition lead or insulation Check ignition lead, replace ignition
damaged
module if necessary
Ignition module faulty
Install new ignition module
MS 171, MS 181, MS 211
13
User Guide - Page 18
... worn or broken or runs erratically
Muffler / spark arresting screen carbonized
Air filter element dirty Fuel ...spark arresting screen, replace muffler if necessary
Replace air filter element
Fit new hose or position it free from kinks
Check tank vent and replace if necessary
Check... cooling fins on the engine:
- 4.7 Engine
Always check and, if necessary, repair the following parts before looking...
User Guide - Page 29
... / Spark Arresting Screen
Always check and, if necessary,
1
repair the fuel system, carburetor,
air filter and ignition system before
looking for faults on the sealing face of the exhaust port.
533RA065 TG
533RA060 TG
1 1
: Pry the plugs out of the muffler by means of heat shield again.
- Tightening torques, b 3.5
28
MS 171, MS 181, MS 211...
User Guide - Page 30
...
1
: Check that the sleeve (1) is not smooth. This can be checked through the inlet port.
: Fit spark plug (1) and tighten it down firmly.
533RA070 TG
533RA071 TG
MS 171, MS 181, MS 211
29
... two screws. -
Take out the screws.
- Remove the shroud, b 8.4
1
: Unscrew the spark plug (1).
533RA067 TG
- Set the piston to enter the engine and upset the fuel-air mixture. Such...
User Guide - Page 41
... serious or even fatal accidents. Troubleshooting on the coil body:
: Remove the ignition module (1).
40
MS 171, MS 181, MS 211 the connector tag (2) for the short circuit wire
Testing in the workshop is no ignition spark is obtained (after checking that wiring and stop switch are two electrical connections on the ignition system should always...
User Guide - Page 42
...(arrows) are an assembly.
- do not tighten down yet. Check the ignition module (1) and ignition lead and replace the ignition module if necessary.
- Check the retainer and insulator and replace if necessary.
: Position the... so that it is against the upper hole.
: Secure the insulator (1) with washer - MS 171, MS 181, MS 211
41 Check the spark plug boot and replace if necessary, b 9.4
-
User Guide - Page 43
... system with the rewind starter and check spark in order. Since there is no spark is visible in the direction of the ignition module and the flywheel magnet.
- The engine may start and accelerate during repair work. Short circuit and ground wires must face the cylinder.
42
MS 171, MS 181, MS 211 ground wire must be...
User Guide - Page 44
... ZAT 3, hold it only by the handle (4) or position it down firmly
- MS 171, MS 181, MS 211
43
Pull the boot off the ignition lead.
- Before starting the test, install a new spark plug in the cylinder and tighten it in the window (3), check the ignition system with the aid of electric shock.
- Remove the shroud...
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