We can easily examine the air filter before checking the carburetor, which maybe causing the chainsaw to stall. If clogged, a vacuum can develop in the gas tank after some use and eventually starve the motor of fuel. #3. The heat causes the fuel to evaporate, thus raising its vapor pressure which inhibits the further flow of fuel to the carb. Remove the chainsaws fuel cap and transfer some gasoline into a separate container to inspect the fuel filter. Again it may not be the problem but one possibility. Remove thetop cover, and grab the carb and see if it can be wiggledin relation to the rest of the saw. Yeah. Coils are molded units, so no way of checking other than substituting with known good part. Good point from mla2ofus. The problem lies in your ignition and must be fixed. The coil provides the electrical current to the spark plug to form a spark that ignites the fuel to start and keep your chainsaw running. From what I've read, my problem is the nature of the beast with these saws. It even gives us gorgeous Fall color from there on in. Ensure that theres no vapor lock in the fuel tank. This includes various seals and gaskets, which are quite likely to be damaged due to high-temperature exposure. Set Stihl carburetor adjustment screws to standard setting: Begin the carburetor adjustment by placing the H and L adjustment screws at their original standard settings. It's the small round plug usually near the fuel line connections. (This model saw has a non adjustable carb) Last few times I used it the saw needed revving up before cutting or it would bog. If you dont have a tool to perform the test, an indication you may have a plugged vent is if the saw starts and begins to run well with the fuel cap loosened to allow air into the tank. Easily find manuals and replacement parts on your phone while youre DIYing in the garage or garden. Houzz Pro: One simple solution for contractors and design pros. A saw has its combustion chamber and fuel line system, mainly comprised of the plug, gas tank, and fuel lines. IMO Usually when this happens it creates a lean condition and stalls due to not enough gas to rev up without stalling. 2) bad plug. On and of switch plus choke Its all managed by one lever. Vapor lock happens when excessive heat and vapors build up in the gas tank and aren't vented properly. Yet there are now newer battery-powered and electric models. You will have to replace the carburetor if this doesnt work. Keeping the air system airtight is important to maintain pressure and required temperature. Purchases made through these links may provide a commission for us, at no extra cost to you. I have a Poulan Chainsaw rebadged as a McCullock here in Australia. Look up "McCullock chainsaw tool" for the postings and you will find instructions in making the tool and a source where you can buy one. When this happens, its best to get a new spark plug instead. Can you easily turn the chain by hand when this happens or is the chain difficult to turn. Vapor Lock. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. Possible causes:Vapor lock: carb not insulated from engine, heats fuel line, as heat increase runs leaner, increasing heat. HELP Please. How long the chainsaw runs before dying depends on how badly clogged the air filter is. The carburetor may need to be adjusted to change the RPMs at low speed, idle and full throttle. Check your electrode to notice any signs of wear and tear. Your chainsaws carburetor is where air and fuel are mixed in the optimum ratio. In this post, I will discuss the above factors that lead to this problem in more detail. You must log in or register to reply here. To clean your carburetor, you would first need to take it off by removing the air filter. If the filter looksclogged, buy a new one toreplace the previous filter. Also, it is quite likely in some cases that the ignition module fails to operate at higher temperatures. cascio.offsite@gmail.com. The air filter screen on your chainsaw is positioned on the backside. I ran the saw today, and it worked fine. Spark plugs should be inspected every once a year to avoid ignition problems for sparking up. Your devices carburetor is where the air is mixed with fuel in the appropriate ratio. Too many options, get help from your local professionals. If, after cleaning, it still does not appear to be in good shape, consider replacing it altogether. Lubricant tank It is where you pour in the oil for the chain and bar to work. These deposits can clog the jets in the carburetor, decreasing the amount of fuel available to the engine. Fuel filter maintenance and replacement should be a regular job. It would catch slightly when warm. Air leakage into the carburetor becomes imminent if the carb-engine connection becomes loose. How is the impulse line? Why does my Chainsaw Die at Full Throttle. Then turn each screw counter-clockwise with the number of turns indicated above the screw. Ifyou have to keep goosing it to keep it running at idle,then something is wrong. i also dont know how to check the vent int he gas tank. Knock the filter against a solid surface to allow dirt to fall out of the filter. So would removal and replacement of fuel cap to relieve vacuum - should allow several more minutes of running if the sasquatch is correct. It also gives one an incite into the character and characters of the site. Gauge and tighten correctly to make sure its the right hold. Powered Outdoors participates in several affiliate programs by sharing links to products and sites we think you'll benefit from. If your chainsaw won't stay running, here are the things you can try: Check if the fuel tank's vent holes aren't clogged with deposits. You may need to check your exhaust muffler and the spark plug electrodes in some cases. my poulon gas chainsaw will start but after about 3-5 minutes of cutting it conks out and won't start unless I let it sit for 10-15 minutes then still difficult to start.happened four to five times in a row.it runs out like it is out of gas but the tank has gas. Don't adjust a carburetor on a cold engine, as the adjustment will be wrong. In this case, youll have to adjust your carburetor. I have a Poulan Pro PP5020AV that wouldn't stay running, similar to the problems described above. Bar Its the central piece that the chain circles around. Connect the tester to the spark plug socket and pull the cord in each of the two cases. If you haven't already install another correct type spark plug. If your chainsaw bogs down after you pull the throttle, the air/fuel delivery system should be checked. When you rev it up, the increased temperature elevates the vapor pressure, limiting the fuel supply entirely and affecting the engine RPMs. Garden Tool Expert Regular checks of the air filter for buildup should be part of your regular chainsaw maintenance routine. Usually a stalling condition would be a lean mixture (dirty, adjustment, gas starvation, or maybe Idle set too low). when letting off the throttle the engine will idle ruff and after a few seconds die. It's just a line with a (grub) screw in it if clogged or. i'm german, i need it !!! Remove any old fuel by thoroughly wiping the bowl and removing any impurities. Check the exhaust to make sure it is not blocked even Partially.. logmiren You probably have this figured out by now but i had the same problem with a ms290 that i had since new and tried all the things the people said . Use a screwdriver to detach the cover at the back of your saw. In general, there are four reasons why a chainsaw runs well until hot. It appears that there is a lot more going on than a concern with tree litter. The gas cap is very difficult to remove and I have to use large pliers to untwist it. :)) xoxo eva @ MONARCHSOFAS.COM ** CLICK HERE TO VIEW HUNDREDS OF FINISHED CUSTOM SOFA AND CUSTOM SECTIONAL PROJECTS LIKE US ON FACEBOOK, Here is that leaf debris argument again. Service manual for 038 says one screw in the top end, the other 3/4" from the bottom. Early bulbs will brighten your days. Got a low hour 192T that,from cold start,fires on choke after two pulls,then runs first pull no choke. I worked fine first year, now it has the same problem as others. Check the filters quality. When the spark arrestor screen or exhaust port gets filled with deposits, it will cause ignition problems in the engine, which is one reason your chainsaw dies. Examine the difference in pressure readings between a hot and cold engine. When it dies give it squirt of gas w/AF off. I hope this may help. Check vent. Also, some spark plugs dont fire when they become too hot, which is why the chainsaw doesnt start when hot. Ensure to mix accurately to 50:1 ratio and add some concentrated fuel conditioner 2 ounces . Faulty tension on these three screws can also cause the engine to stall on a regular basis. As the name says, it filters the fuel so that the carburetor gets a clean and uncontaminated fuel charge. Next, while the chainsaw is idle, make sure the chain is not moving. #1. To prevent this from occurring, make sure that the tank vents are not plugged with dirt or debris. When you find a clogged fuel line, remove it from the chainsaw and clean it to open the line. Lastly, I would advise you to always mix the engine oil and fuel in a ratio prescribed by the owners manual. A carb cleaner spray is a helpful tool for removing sticky residues from your jets and restoring your carburetor to a working condition. Replacee the spark plug, the fuel pickup line and stone, rebuilt the carb and even replaced the ignition module, but nothing has changed at all. I would mark where the screws are now and count the turns in say 1 3/4" to seat lightly. Looked like someone forced it on and damaged the fuel line in the process. You never want to run your chainsaw without an air filter. I would not be tempted to walk around the pool barefooted. New part-time arborist. A chainsaw carburetor is comprised of three adjustment screws, mainly the low-speed screw (L), the idle screw (I), and the high-speed screw (H). Check that the choke is operating properly. Together we put a lot of effort into the maintenance of our gardens over the last few years, we become obsessed with it. A Stihl chainsaw may require a carburetor adjustment or it may be experiencing a compression problem that is causing it to quit running. #1. hello all, i have a 2 year old ms361 i bought new. Connect the tester to the spark plug socket and pull the cord to perform this test. Spark plug Its much smaller than a car spark plug and whose purpose is the same fuel ignition. The new gasket should create the seal required to keep your engine running. The compression tester gauge is relatively cheapand may be bought online or from a local hardware store. The above adjustment method could be used to fix most engine problems. The passageways can become clogged and the small components can fail to function correctly which can be the reason the chainsaw stops running. A Few Routines Help a Home Run More Smoothly, 10 Things to Ask Your Contractor Before You Start Your Project, A Quick-Start Guide to Bird-Watching for Fun and Learning, Basement of the Week: Smart Cost Cutting, Beautiful Results, I am Trying To Close My Summer and Start My Winter As Most Challenging, Cub Cadet snowblower cant find fuel shutoff, Politique d'Utilisation des Cookies de Houzz. One day started surging when hot and then would shut down. Dont over-adjust and allow the RPMs to increase too much or you will damage the engine. I have the Poulan saw and it cuts out after about 2-4 minutes. If your saw dies at idle, turn the idle screw clockwise until the chain just starts to move. Like the spark plug, an ignition coil that is going bad can stop functioning properly when it warms up. Stihl does have some limits to the adjustments you can perform to the carburetor. Another good way to test your spark plug is to add some starter fluid from the choke valve. One of the biggest problems was that I would use it for a few minutes and then go to idle and it would stall and refuse to start till it cooled down. The fuel filter is a small cylinder-shaped part located inside the fuel tank. Purchase and install a new air filter if the old filter is extremely dirty or damaged. I still need to find hardware, No need to feel overwhelmed. But, it's alway good to know where the carb. Take the bowl and bowl nut out of the carburetor. Follow all safety instructions provided in your equipment operators manual prior to diagnosing, repairing, or operating. Similarly, check the spark plug to assess the ignition system. How do you Fix a Chainsaw that wont Stay Running. These vents ensure that the trapped vapors can escape. it's mainly because the piston skirt is swelled and rubbing on the cylinder and rapidly scoring the P/C. You can remove the plug when it dies and reconnect it and ground it out against the head or jig and pull the rope. Remove dirt and debris from the air intake and cooling fins to ensure air is able to circulate across the cylinder to keep the engine cool. Do not rely on neon spark testers, they will lie to you. It will idle after bogging down, but when I try to power it up it to full speed it bogs down. Make sure the filter is securely attached to the fuel line. Chainsaw then works just fine. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Copyright 2023 eReplacementParts.com Inc. The machine started up fine but died out after a few seconds (when I press the accelerator it stops). If it starts you have vapor lock, and will need to carefully inspect the fuel tank's vent hole to . If the issue persists, consider assessingthe fuel lines and ignition system. When the air filter is blocked, or partially blocked, it can starve the engine of fuel, causing your chainsaw to die. 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