Tractor. The Chainsaw" Taryl shows you how to replace the safety hand brake on your Stihl Chainsaw. N Push the hand guard (1) forward – the chain is locked. Insufficient Chain Tension. Basically, the saw dies when the brake is applied. The STIHL MS 170 is a lightweight and compact chainsaw designed for ease of use and maneuverability. 5. Apr 27, 2017 · In this easy to follow video I show you how to replace the chain brake handle on a STIHL MS260 chainsaw. Problem 5: Chainsaw Loses Power and Bogs Down. Check for circuit breaks and replace the coil. 0 cm3 MS 391: 64. specifically for the EZ start. If the engine is cold: Press down the trigger lockout (2) and pull the throttle trigger (3) at the same time. If the clutch band is worn out, the motor will run, but the clutch band will not engage the clutch drum. If the stop lever is engaged, the chain won't turn. Inadequate Lubrication. Dirty Carburetor. Saw is hard to start (starts after maybe 10-15 pulls) and when it starts it bogs and it wont accelerate. Plugged or Punctured Fuel Line. The type of metal used in the bar nose. Fast dulling chain. Nov 1, 2023 · Engage the Chain Brake: For safety, always engage the chain brake before starting. Following the manufacturer’s guidelines will ensure that the replacement is done correctly and safely. With an exceptional power-to-weight ratio, the STIHL MS 250 is up to the job. It is lightweight and maneuverable features reduced exhaust emissions and an anti-vibration system for increased operator comfort. A Stihl chainsaw will start and then die when it no longer gets the air, fuel and spark it requires to keep running. Fortunately, most of these problems are minor and considerably easy to solve. Despite its strengths, some owners report challenges with Apr 30, 2023 · Locate the spark plug and remove the boot. 7,359. STIHL OILOMATIC® Saw Chain. Clean the carburetor, air filter, and spark plug. Chain Brake failure. Stihl MS 271 Problem 4 – Bar Nose Wearing Out. A Weak Part. com Jan 27, 2021 · A useful little trick is to refit the bar with the chain and use a couple of washers to replicate the thickness of the cover plate. Landscape Business Names AP 500 S Battery Among Top 20 New Products for 2023. Follow the instructions depending on your chainsaw tension adjustment features, and tighten the chain appropriately. Jan 2, 2024 · Engage the chain brake when not in use. #1. As a result, the chain won't turn. Disengage the chain brake and check if the chain is running freely. A chain that is too tight can damage Aug 5, 2022 · Starting at $599, the MS 391 Stihl chainsaw goes up to $999. STIHL recommends using only STIHL replacement parts for the repair and Nov 6, 2022 · Check fuel for quality and correct mix – recommend replacing with a known mix. Overheating is a common problem among STIHL MS 291 chainsaws. Sep 14, 2023 · Description: This recall involves the braking system of the STIHL MSA 300, a battery-powered chainsaw. Observe all Oct 26, 2023 · Problem 3: Chain Brake Malfunction. Bars and chains are not being lubricated. Inspect the Chain: Examine the condition of the chain, guide bar, and sprocket. Ideal for cutting firewood and trimming small trees, it May 16, 2015 · If the chain on your chainsaw won't move, but the saw runs perfectly fine, you most likely bumped the safety feature. Several features make the MS 391 a worthwhile investment, including its chain brake system, which prevents the bar from spinning at maximum speed, a chain oiler, which lubricates the chain during operation, and a low-friction piston head. Nov 6, 2022 · 10 Basic Checks For The Stihl 021 Chainsaw. For additional assistance, please contact our customer service number at 1-800-269-2609, 24 hours a day, seven days a week or send us a message using the live chat How to fix. Start the machine and run it in the Cold start position for at least 90 seconds. Problem 2: Chainsaw Starts, Stalls & Dies. It is easy to forget to release the brake before starting a cut. #6. Engage the brake again and check that the chain does not move. Nov 11, 2022 · 10 Basic Checks For The Stihl MS 230 Chainsaw. Problem 3: Chainsaw Chain Won’t Turn or Move. Step 6: Properly Use the Choke. Now there i Apr 30, 2023 · Locate the spark plug and remove the boot. Do not touch the throttle or accelerate the saw during this time. Omaha, Nebraska. Jun 7, 2019 · The clutches are real heavy duty and have a bearing that almost never fails, a double needle bearing. The clutch band drum brake engages the clutch drum to allow the chain to rotate. Parts diagram for MS 250 relevant to this repair Dec 3, 2015 · 8,986. Most 028 wood boss versions came with chain brakes, especially Oct 19, 2023 · Check the Oil Filter: Inspect and clean the oil filter to ensure it’s not clogged. Dec 3, 2015. The STIHL MS 250 Chainsaw features a great power-to-weight ratio with a 45. Below is a list of its most frequent complaints: Chain fails to start. Stihl Chainsaw Won’t Start After Running. Before that, you are supposed to prepare a set of small engine adjustment tools. You will need a screwdriver, pliers, Torx bit T-25, paper towels, a small brush, air hose, and WD-40. All safety precautions that are generally observed when working with an axe or a hand saw also apply to the operation of chain saws. May 13, 2024 · Electric chainsaws have a simpler construction than petrol tools, so they require fewer cleaning and maintenance steps: Remove shavings and dust from the whole chainsaw (use a soft brush, paintbrush or STIHL resin solvent) Clean the sprocket area with a damp cloth or STIHL resin solvent. Here are the steps I worked through to repair it. First, turn off your chainsaw. Step 5: Check Compression. Then, locate the starter cord and pull it out slowly until you feel resistance. May 7, 2023 · Overview of Common Problems of STIHL MS171 and Their Solutions. Clogged Fuel Filter. The Stihl MS 280 is a reliable chainsaw renowned for its robust performance in both professional and domestic environments. If the chain is not properly tensioned, it can slip on the bar and cause the brake to not engage. Move at least 3 meters away from the place where the machine was refuelled and never start the motor in enclosed spaces. Another problem is the ‘bar nose’ (the part of the saw that the chain runs around) wearing out too quickly. and 2000/14/EC and has been developed and manufactured in compliance with the following standards in the versions valid at the time of production: Feb 13, 2024 · Common Stihl MS 280 problems include starting difficulties, irregular idling, and chain oiling issues. Apr 1, 2021. Replace the fuel filter. Dec 14, 2022 · 13. Rob shows us in detail how to remove and replace / install a new brake handle on a still chainsaw Feb 22, 2024 · So if you’re experiencing problems with your Stihl chainsaw chain brake, read on for help. If you do this wrong, you may break a weak part and spend a lot of money to replace the whole part. After 90 seconds, switch off the machine. The chain brake system works by tightening the chainsaw’s brake band around the clutch drum. It’s making a grinding noise. The MS 162 chainsaw is optimal for homeowners and occasional use. In both of these cases the brake, once activated, is designed to Jul 21, 2017 · Hi everyone Apologies if this has been mentioned before, read up on past posts but I have a slightly different issue. Spark plug faults. It boasts a 30. Check the air filter for blockage. The way that the chain is tensioned. So the problem is i cant diagnose whats wrong with it. Unscrew the old spark plug and inspect it. TC-40D SS New Holland. Check safety components. FAQs of Stihl Ms 391 Problems What Is the Problem With the Stihl Ms 391 Chainsaw? ELECTRIC CHAINSAW MAINTENANCE. Repair it or replace it. Inadequate or incorrect fuel mixture can lead to engine problems. You can also view 028 parts diagrams and manuals, watch related videos or review common problems that may help answer your questions to get started on fixing your Chainsaw model. A STIHL chainsaw won’t start when it isn’t getting sufficient air, fuel, or spark. The spark arrestor is a small screen that prevents the engine from emitting sparks. Lack of Fuel Causes a STIHL Chainsaw to Lose Power. Inspect the fuel filter for any clogs or debris. If oil isn’t dispensed onto the cardboard, the oil pump may be faulty. Problem 1: Chainsaw Won’t Start. Lock the chain with the chain brake Nov 4, 2021 · Common Stihl Ms 271 Chainsaw Problems. In this section, we will explore what causes the chain brake to malfunction, provide troubleshooting steps to fix the issue and emphasize critical safety considerations when dealing Jun 8, 2020 · The main reason is the groove of the drive link is not properly sink on the chain drive. The engine should fire and begin to run. Location. Hello i have a problem with my *s-wordbox 066. However, there are a few common problems that can cause a Stihl chainsaw brake to stop working. Debris or mechanical obstruction. Choke to start. Chain Brake is Engaged. If the weather is too cold, allow the chainsaw to cool down. The STIHL Quickstop® chain brake is designed to stop the rotation of the chain if activated by the operator’s hand or by inertia if the saw kicks back with sufficient force. Firstly, you need to take off the cap Jan 14, 2023 · Check and ensure the chain brake is disengaged if the chain is not rotating. 2. The MS 170 chainsaw is a lightweight tool with a 16" bar, perfect for homeowners. Place the chainsaw on a firm, level surface. 1: Chainsaw Won’t Start: 2: Chainsaw Runs Roughly: 3: Chainsaw Chain Keeps Coming Off: Reasons for Chainsaw Chain Coming Off: 4: Chainsaw Doesn’t Cut Properly. In this section, we’ll emphasize the importance of a functioning chain brake, provide guidance on diagnosing and addressing chain brake problems, and offer maintenance Apr 3, 2016 · In "TJ VS. Repair takes about 30 minutes. Check if the problem emanates from a clogged carburetor. Not starting. If the fuel tank is empty, mix and refuel the chainsaw. Loose or damaged chain brake cable. Check fuel supply pickup and hose for blockage or cracking from age. Try this before you send it in for repa If your electric chainsaw has a problem, there could be more than one causal issue. Check out the ignition coil as well. Malfunctioning ignition coil. Not sure how the tension is supposed to be built . the chain saw. It stops when cutting. Nov 1, 2023 · In this blog post, we’ll provide a comprehensive guide to the 5 most common STIHL MS 170 problems, along with their causes and solutions. Examine the Spark Plug: Carefully remove the spark plug and inspect it for fouling, damage, or wear. satisfaction from your STIHL chain saw and, if followed, reduce the risk of injury from its use. 5: Chain Not Turning: 6: Chainsaw Starts and Then Stalls: 7: Echo CS-400 Carburetor Problems: 8: Chain Won’t Stop Turning: Master Control Lever™. Other issues like a clogged air filter, dirty carburetor, or fuel supply problem could also prevent starting. As before, the chain brake can be activated by the inertia of the front hand guard in certain kickback situations or manually by pushing the front hand guard toward the bar nose. Check for spark. 6. Problem 4: Chainsaw Runs With the Choke On. Find the most common problems that can cause a Stihl Chainsaw not to work - and the parts & instructions to fix them. The Chain saw is not cutting. The engagement of the brake band in a running chainsaw causes friction, eventually making the chain stop rotating. The chainsaw isn’t oiling the chain. Remember: A well-maintained chainsaw is a durable chainsaw. Check your brake handle. Check your AV mounts and rubber hoses/sealing parts. To diagnose this problem start by inspecting the spark plug for any signs of damage or wear and tear and replacing it if necessary. Chainsaw Is Smoking. In this guide, we will discuss the most common causes of a and provide step-by-step instructions on how to troubleshoot and fix the problem. Solution: Venting the Fuel Cap: Sometimes, the fuel cap can become clogged or fail to vent properly, causing a vacuum in the tank. Feb 10, 2024 · Step 2: Inspect the Ignition Coil. In this section, we’ll emphasize the importance of a functioning chain brake, provide guidance on diagnosing and addressing chain brake problems, and offer maintenance Feb 22, 2024 · So if you’re experiencing problems with your Stihl chainsaw chain brake, read on for help. STIHL produces the number one selling brand of chainsaws and a full line of outdoor power tools from blowers, trimmers, brushcutters, to construction tools. Remove any blockage in the oil hole and oil line. Here are 3 components that play along in the working of chain brake: Nov 5, 2023 · Some common problems include: 1. Common Chainsaw Problems & Solutions. Sharpen the chain using the file or electric sharpener. 4 cc engine, an ergonomic design, and is built for tough tasks and reliable performance. The Master Control lever (4) is in the normal run position F. 03 - Stihl Chainsaw Drum Brake. If it does, consider replacing the fuel cap if necessary. I used them before so I know how there are supposed to work. Replace old fuel. A malfunctioning chain brake on your STIHL MS 361 chainsaw is not just an inconvenience; it’s a significant safety concern. Empty Fuel Tank/ Stale Fuel. The saw has had a new clutch, rim sprocket set including drum and needle bearing, brake band, and new oil worm gear. See full list on poweredoutdoors. Maintaining proper chain tension is crucial for efficient cutting and preventing chain-related issues. Importance of Understanding and Troubleshooting Common Problems. 19K views 2 years ago LARMONS SMALL ENGINES. Solution: Clean the oiler port, inspect and repair the oil pump, and always use the recommended chain oil. The Master Control Lever™ allows you to operate the choke, throttle lock, and on-off switch with a Jul 2, 2018 · 5 Pack Air Filters for Stihl MS180 MS170 018 017 Seires Chainsaw, ADEFOL Chainsaw Replacement Parts Air Filter Accessories Compatible with Stihl Chain Saw $7. This prevents the chain from moving while the engine is running. Oct 8, 2003 · Messages. Was using it and when I hit the brake heard something snap and it no longer functions. To unclog the spark arrestor, remove it and clean it with a wire brush. Release the chain brake. Solution: At the time of chaining the groove, drive link or anything of chainsaw make sure you Bumper Spikes. Remove the spark plug wire before performing repairs. Use a carburetor cleaner to remove any dirt and debris. Internally is the chainsaw chain drive will not match with the shape of the groove, the rate of friction will increase. This can lead to starting issues, running problems, and poor engine performance. Hold both levers in that position and set the Master Control lever (4) to start symbol }. Refer to the Stihl chainsaw’s user manual or the specific repair manual for your model to understand the step-by-step instructions for replacing the damaged parts. Pull the Starter Cord: Grasp the starter handle firmly and give it a smooth, brisk pull. Another common issue with the Stihl MS 391 is a faulty spark plug. 49 HP motor and several excellent features, making it highly reliable for day-to-day DIY activities. Serial numbers lower than 447457319 are included in Nov 6, 2022 · 10 Basic Checks For The Stihl 041 Farm boss Chainsaw. But few days before it would be hard to start but it would accelerate and idle and it would take a carb adjustments, only Oct 21, 2023 · This blog post delves into the common issues that STIHL 462 chainsaw users may face and provides in-depth troubleshooting steps to help you resolve these problems efficiently. When you pull it over everything rotates together. Check the fuel filter for blockage. Here are the 5 most common electric chainsaw issues: The electric chainsaw won’t start. Understanding and troubleshooting common problems with your STIHL 462 chainsaw is essential for several Sep 21, 2018 · Method 1 for M-Tronic re-set: Remove the scabbard. If necessary, replace it with a new spark plug recommended by the manufacturer. Nov 17, 2020 · Chainsaw expert Dale explains why it is so important to release the chain brake before performing any maintenance on your saw or attempting to take the cover Nov 24, 2022 · Stihl MS 193 T Problems. Faulty spark plug. Nov 7, 2023 · If the chainsaw has been sitting idle, consider draining the old fuel and replacing it with fresh fuel. Ensure the chain brake is engaged (on) Put the machine in the Cold start position. You can replace the carburetor if it’s faulty. 99 Get it as soon as Thursday, May 30 Mar 19, 2021 · Jul 18, 2021. Step 7: Vapor Lock issue. This avoids the risk of the engine starting unintentionally. Feb 8, 2024 · Solution: Regularly service the chainsaw according to the manufacturer’s recommendations. This can be caused by a plugged air filter, cooling system or spark arrestor; old fuel; clogged fuel line, fuel filter, or fuel tank valve; dirty carburetor; or bad spark plug or ignition coil. The tone of the engine changes and it begins to run roughly, eventually cutting out. Users may also face decreased engine performance over time. SAVE THIS MANUAL! Have your authorized STIHL servicing dealer show you how to operate your chain saw. Over time, the spark arrestor can become clogged with soot. Do not start the chain saw if the chain is in a cut. Chainsaw tension failure. Replace the carburetor. 01 - Stihl Chainsaw Spark Arrestor. 99 $ 7 . May 17, 2024 · With that said, here is a complete rundown of the probable culprits that are causing your Stihl chainsaw to not start. Remove any burrs forming on the bar Oct 23, 2023 · A functioning chain brake is not just a convenience but a critical safety feature in your Stihl MS 661 chainsaw. Feb 13, 2024 · Inspect the brake band and replace it if necessary. Fill with bar and chain oil. Lack of Spark Causes a STIHL Chainsaw to Lose Power. MS 391 Serial identification number: 1140 Displacement. And if the weather is too hot, it will enable the chainsaw to warm up to, at the latest, +10 degrees. 1. Set the chain tension using tension screws. Step 4: Check the Flooded Engine. Feb 13, 2024 · The STIHL MS 271 chainsaw comes with a 3. Check fuel for quality and correct mix – recommend replacing with a known mix. Free repair advice! En español. Table of Contents hide. The later Tilstons/038 super were same size as the Bings on the 038M. Exploring the Stihl MS 362 chainsaw reveals a reliable powerhouse appreciated by professionals for its robust performance in demanding situations. Disconnect the spark plug. I know this is a pretty basic thing, but still – make sure your chainsaw fuel tank is topped off with fresh fuel if you are having starting issues with it. Periodically check the tension and adjust it using the tension screw to make sure the chain is tight but not overly tight. Clean or replace the spark plug as needed. 029 044 MS 170 MS 180. Stihl MS170 Won’t Start – FAQs. Dirty Spark Plug. Clean the brake mechanism and ensure proper lubrication. The chainsaw is gray and orange. Follow these steps to ensure your Stihl MS 391 runs smoothly for years to come. The recalled chainsaw’s serial number is located on a label on the rear hand guard. Apr 2, 2021 · Big Island. Try loosening the fuel cap slightly to allow air in and see if the chainsaw starts. To check the chain tension, hold the chainsaw with the chain off the ground and pull up on the chain. Inspect the fuel system. THE OPERATOR Physical Nov 7, 2022 · 10 Basic Checks For The Stihl MS 181 Chainsaw. Replace the air filter. I just picked up this saw for the Mrs. Stihl MS 391 Chainsaw with a 25" Bar - First Use and Speed Test. Chain brake failure can lead to serious accidents and injuries. Jan 11, 2024 · Common issues with the Stihl MS 362 chainsaw include starting problems, power loss, and irregular idling. Can't do much about the body nubs, but you can replace the plastic insert for a few $. The second issue comes in the process when you replace the carburetor on your Stihl MS170 or MS180 chainsaw. If it has a handle with two windows, I have to agree with Warped5. Aug 26, 2023 · Assuming you are referring to a Stihl MS 250 chainsaw: To start a Stihl MS 250 chainsaw, first make sure that the chain brake is engaged by pushing the top handle forward. Northeast, Ohio. However, you may encounter some STIHL MS 271 chainsaw problems in the long run due to operating continuously. Replace it with fresh fuel. When you rely on firewood to keep your home warm and cozy, you need a good chainsaw to build a solid woodpile. small engine guys. MS 311: 59. Look for signs of wear, damage, or misalignment. Jul 29, 2022 · 2. Brake fails. Brief Overview of the STIHL MS 170 Chainsaw. Experience cutting excellence with STIHL. In my case, the brake band was broken (#7 in figure below). Apr 17, 2005 · Lakeside53 said: Two reasons: -The drums get flared from use, so when you activate the brake it moves to the outside; - the small landing zones cast into the body get worn or eroded/corroded way. Clean the air filter, carburetor, and spark arrestor. The early Tilston carbs (48mm bore 038) were smaller bore. 1-800-269-2609. Verify Oil Pump Operation: Run the chainsaw while holding it over a clean piece of cardboard. It is called a STIHL Quickstop® chain brake. Oct 23, 2023 · A functioning chain brake is not just a convenience but a critical safety feature in your Stihl MS 661 chainsaw. This problem may result from insufficient oil, blunt chain, incorrect chain tension, and blocked exhaust port. 35K subscribers. They are specifically designed to match your model and meet your performance requirements. Step 3: Clean the Air Filter and Carburetor. The plastic insert then takes the brunt of the brake band moving. Other Item That Causes a STIHL Chainsaw to Lose Power. This ensures our authorized full-line servicing STIHL Dealers are best able to service your STIHL equipment. I took it apart & both springs look good. Most Common Reasons Of Stihl Chainsaw Chain Brake Not Working. Check all ignition components and repair or replace any defective parts. Chain runs rough. Possible Causes: Inadequate lubrication may result from a clogged oiler port, a malfunctioning oil pump, or the use of the wrong type of chain oil. The saw will typically restart easily but dies unless chain break is disengaged. Quick Fixes. 1cc engine, a 16-inch bar, and a chain When your Stihl MS 251 won’t start, the problem typically lies with the ignition system: Defective wiring. STIHL chainsaws are equipped with a chain stopping system designed to reduce the risk of injury in certain kickback situations. STIHL recommends the use of genuine STIHL replacement parts. Make sure that the stop lever is disengaged. Mar 24, 2015 · The saw typically runs fine when the chain break is not engaged. The chain should be slightly elastic when pulled from the guide bar. A chainsaw may start to have a hot smell or even feel burning in your hands if there is a problem with the exhaust. Regular maintenance is vital to ensure the longevity and safe use of your Stihl MS 310. Safe use of a chain saw involves 1 the operator 2 the chain saw 3 the use of the chain saw. This may be due to a plugged air filter, plugged spark arrestor, clogged fuel line, plugged fuel tank vent, plugged fuel filter, dirty carburetor, bad spark plug, faulty ignition coil, or old fue l. View more. Remove the spark plug & follow safety precautions. 2011/65/EU, 2006/42/EC, 2014/30/EU. Problem: An Overheated Chainsaw. As a result, the temperature will rise up. Free repair advice! Pulling this lever forward activates the chain brake. I had a probl Nov 7, 2016 · The safety brake handle on my Stihl MS250 chainsaw is flopping around and no longer stopping the chain. May 11, 2023 · Welcome to our YouTube video on troubleshooting common problems with the Stihl MS 391 chainsaw! If you're a proud owner of this powerful tool but have encoun Your chain saw is a one-person saw. The chain brake cable is a critical component of the chainsaw’s safety system. Problem: Chain brake is a common issue that is dangerous for safety. Carburetor Needs Adjustment. Users also report difficulties with the saw’s fuel system and air filtration. The same procedure will apply to many other chainsaw Nov 2, 2023 · Check for Fuel and Oil: Ensure the fuel and oil mixture is correct and that the chainsaw is properly lubricated. Chain tension. I have a Stihl chain saw, approx. Pull the starter rope to see if the engine turns over and if compression is adequate. If it's a solid piece, it may not have a chain brake, but if it has a pair of windows, you will likely have a chain brake on board already. Aug 24, 2021 · stihl ms171 chainsaw chain brake stuck frozen diagnosis. Brake handle difficult to engage. It’s not cutting properly. Landscape Business announced that the STIHL AP 500 S battery received the “Twenty for 2023” New Product Awards. Electric chainsaws have a simpler construction than petrol tools, so they require fewer cleaning and maintenance steps: • Remove shavings and dust from the whole chainsaw (use a soft brush or paintbrush) • Clean the sprocket area with a damp cloth or STIHL Hedge Trimmer Blade Cleaner/Resin Remover • Clean This STIHL chainsaw is equipped with a chain brake system that can be activated in three different ways. Conclusion. Prior to the fix, Tim Burr from Timber Tree Service fin Dec 15, 2023 · Shut off your chainsaw engine; remove the battery if it’s a battery chainsaw; disconnect the power supply if it’s an electric chainsaw. Restart your chainsaw to see if everything is fine. Clean the bar groove. It’s easy to use and combines great features to tackle clearing or cleanup tasks, as well as cut through small limbs and trees. How to Start a Stihl MS 170 Chainsaw – Easy Steps. Feb 22, 2024 · Most Common Reasons Why Stihl Chainsaw Brake Not Working. It is caused by a combination of these factors: The design of the bar nose. Nov 29, 2023 · 3. 1 cm3 conforms to the provisions of Directives. Jul 17, 2020 · I thought I'd do a review on the Stihl MS180 (BC variant = easy start + easy chain tensioning) chainsaw after having it for a year and a half. Genuine STIHL parts, service manuals, and Illustrated parts lists are released exclusively to authorized dealers, technicians, and distributors of our products. However, upon engaging the chain break the saw starts to run poorly. This includes cleaning or replacing the air filter, checking the spark plug, and ensuring proper fuel mix ratios. This one just pulls over like a regular saw. 17 Steps to Service and Tune Up a Stihl Chainsaw: Gather tools and supplies. By following these maintenance solutions, users can effectively address common issues and maintain optimal performance of the STIHL MS 500i chainsaw. If the spark arrestor is clogged, the chainsaw may run stall or run rough. Use a protective cover to shield the chain. Do not allow other persons to be in the working area – not even while starting. Check the carburettor settings are correct (including the idle adjustment). A worn brake band or a damaged mechanism. This isn't a case of something wearing out like a pad or band as it suddenly stopped working. Overheating. 9-10 years old with a chain-brake problem. “STIHL” and “MSA 300” are displayed on the side of the chainsaw. rg jz rt og lk gn ph mb px vf