This post may include affiliate links. These vents ensure that the trapped vapors can escape. I also have a Poulan with the same behavior. Stihl does have some limits to the adjustments you can perform to the carburetor. Steps we took to get to the final result. My Stihl has one. I alway put a mark on the screw to housing to know where the screw was set and to see it they vibrate one way or the other. Reading this post made me think about my own chain saw. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. If you cant remove the clog or you find the fuel line is dry and cracked, you need to replace the fuel line with a new line of the same diameter and length. Clean the screen with a metal brush. Chainsaw vs Sawzall. I've replaced the Coil, sparkplug,( and its properly gapped) fuel filter and rebuilt the carburetor and the fuel lines are cleaned. Make sure the filter is securely attached to the fuel line. Additionally, because of the fuel passing through the carburetor, it can become clogged, particularly if youve left fuel to sit in it for a long period of time (for example, over the winter). Clean around the air filter to remove any dirt and sawdust. Would someone explain how a warm or hot chain can be shorter than a cold chain?Mike, Almost everyhing (certainly metals) expands with heat. Once I adjusted the carby it was fine. Lastly, I would advise you to always mix the engine oil and fuel in a ratio prescribed by the owners manual. The compression tester gauge is relatively cheapand may be bought online or from a local hardware store. Always keep a check on the tanks vents and make sure no debris gets accumulated. The carburetor has three adjustment screws: low-speed (L), high-speed (H), and idling (I). Ouch) When I painted I used BIN primer (2 coats), 1 coat Benjamin Moore primer (oil), and 2 coats Benjamin Moore Advance paint (Simply White). Apparently new also . This sticky fuel can clog up the carburetor . Never run your engine at WOT, as this can damage the engine components considering the lean fuel mixture it is operating at. It should fire immediately off the carb. Fuel filter maintenance and replacement should be a regular job. Regular checks of the air filter for buildup should be part of your regular chainsaw maintenance routine. It will starts right back up, but won't stay running. One more simple thing..When it stops, how tight is the chain? Musta gotten blurry and missed that. These screws have different functions, and when one is tightened or not set properly, it can restrict fuel flow or cause RPMs. JavaScript is disabled. Give it a try. You will need an inline ignition tester to do this. The fuel tank can be under vapor pressure while hot. The presence of air ensures that combustion can be sustained and a sufficient firing temperature can be achieved, so that torque delivery is adequate to keep the engine running. Bar Its the central piece that the chain circles around. Sawinery is a one-stop source for anything woodworking-related. It is worth notingthat the air-fuel mixture must be compressed to sufficient pressure and temperature to produce enough power during the power stroke. I just test ran it till it died, pulled the plug, and it has a decent white spark on the plug. Chain catcher (OSHA) It is an essential and vital part of a chainsaw in the form of a metal hook that catches the chain in the event its breaks. Probably a fuel starvation or air leak. Another problem is prolong storage the little passages get gummed up. Ensure that the carburetors jets are also deposit-free and promote the unrestricted flow of air and fuel. Hi Folks, I have a Sthil 250 and my problem is it runs for about 20 min then dies and will not crank for at least a week or so. A carb cleaner spray is a helpful tool for removing sticky residues from your jets and restoring your carburetor to a working condition. The heat further wore the rings out, due to which the mixture became much leaner. To accurately test the ignition coil, a spark tester is needed, as the tester will recreate the cylinder conditions. cascio.offsite@gmail.com. Carefully remove the spark arrestor screen. thanks for the quick response. Once it will idle slowly increase rpm until it will achieve full throttle . The screws are labeled H for high speed, LA for idle speed, and L for low-speed. Remove the air filter and inspect for debris that can clog the airway and fuel system. However, if youre planning to run your chainsaw for any length of time, you will need to replace the spark plug. Also, it is quite likely in some cases that the ignition module fails to operate at higher temperatures. Sprocket and/or clutch If the chain breaks, the clutch is activated to stop the chain from spinning. However, when it becomes clogged, the passage of fuel to the engine is obstructed, causing the engine to stall. Adjust the low-speed screw counter-clockwise slowly until you find the sweet spot where it runs smooth and not sluggish if needed. When it dies give it squirt of gas w/AF off. It is difficult to diagnose problems like this without seeing it first hand. Lean adjustment It manages the devices fuel and air mixture. That is your problem I think..too much nitrogennitrogen fertilizer makes too much leaf growth only. The most common problem causing your chainsaw to run slow or die out is a vapor lock in the fuel lines. thanks. Op has not gotten back to us since Monday , apparently has moved on lol . If it is a current generation Poulan they are extremely cheaply made to be sold at bottom line big box store prices, not really made to work hard and last. I will list specific ways of troubleshooting the issue and fix it. Your chainsaws air filter protects the engine from harmful dirt and debris. Ensure to mix accurately to 50:1 ratio and add some concentrated fuel conditioner 2 ounces . Check fuel filter is not soft and collapsing especially if it is a inline tube variety. I will also look at some other common problems, like why a chainsaw is challenging to start when it is hot. A worn or damaged piston and cylinder will cause this problem. i'm german, i need it !!! Robert Johnson is a woodworker who takes joy in sharing his passion for creating to the rest of the world. Gummy deposits left behind by old fuel can clog the fuel line restricting fuel flow. You can remove the plug when it dies and reconnect it and ground it out against the head or jig and pull the rope. Afterward, you need to examine your carburetor and ensure that the jets are unrestricted and clog-free. Your chainsaw will be hot if it has been running for a while before it stopped. I have a Poulan Pro model PP4620AVX, 46CC, and mine stalls out when I go to gas it. Good point from mla2ofus. Unscrew the carburetor, inspect it for damage, and clean it if necessary. Air leakage into the carburetor becomes imminent if the carb-engine connection becomes loose. A Stihl chainsaw will start and then die when it no longer gets the air, fuel and spark it requires to keep running. 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. Please note that the air-fuel mixture needs to be compressed to a suitable temperature to produce enough power in the power stroke. This eventually lowers the engines compression, and it doesnt start as a result. it has the above described problem. Similar project but I am waiting on the counters. Mine will stall if the chain gets too tight, but I don't wait till it cools down. 2022 LawnMowerForum.com. New valve = new saw. Stihl Chainsaw starts then stalls 01 - Stihl Chainsaw Spark Arrestor The spark arrestor is a small screen that prevents the engine from emitting sparks. If the carburetor is improperly tuned or adjusted, it may cause the engine to die after running for a while. Throttle Interlock It keeps misuse and accidents for occurring. Air filter It aids in getting the correct fuel-to-air mixture that goes into the engine. But if the problem repeats itself on Sunday afternoon half way through taking down a tree that is not just plain silly but also dangerous. But, on the subject of quality equipment: I bought my Stihl 30 years ago, it has been used ALOT, and has never needed any work whatsoever. Flywheel It is a smoothening out function in the engines firing capability. There are also many other possibilities but the saw if of current generation is probably not worth the time, money and effort. I would love quartz but the price tag is just too much right now. Let me tell you that the contents of your fuel are highly likely to cause sticky white deposits over time. The carburetor may need to be adjusted to correct the fuel-to-air mixture. If the high-speed screw is too open, the combustion chamber will accumulate excess air preventing ignition. #3. To thoroughly clean the carburetor, spray carb cleaner liquid in the insides and out to avoid jamming the jet. This also creates a hard starting condition. The problem lies in your ignition and must be fixed. Check the Filters. Why does my chainsaw start and dies? A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. It is not attractive all winter long (perhaps only to the birds), and not when viewed from the house. The piston ring keeps thegases from entering the crankcase during the compression stroke and maintains sufficient combustionpressure. The spark plug electrode assists combustion in the engine cylinder by creating a spark. Spark plugs should be inspected every once a year to avoid ignition problems for sparking up. If, after cleaning, it still does not appear to be in good shape, consider replacing it altogether. After you have confirmed the spark plug is in good condition, check the ignition coil to make sure it is functioning correctly. Manual fuel pump Its a mechanism that makes the saw engine easily start. How old is it? In the case that your chainsaw runs for a while, then dies, it may be possible to simply clean the air filter to correct this symptom. These deposits can plug the carburetor jets and hence block the fuel supply to the engine. Early bulbs will brighten your days. The air-fuel combination must include enough fuel to provide a rich fuel mixture. It purrs. Manage Settings A chainsaw has two filters to regulate air circulation and one to keep debris out of the fuel, and all of them need regular servicing. From what I've read, my problem is the nature of the beast with these saws. The chainsaw may need the choke engaged to . As the engine runs, heat will build. Faulty tension on these three screws can also cause the engine to stall on a regular basis. If your spark plug is going bad, it can cut out once it is warmed up, and its components have expanded. Check the carburetors jets and make sure that they are kept clean and free of debris. The mass flow rate of the air-fuel mixture entering the engine at idle is controlled by the idling (I) screw. A sunken hot tub, dedicated game room, tree house, hidden wine cellar and more. the screw works into the line tank won't vent. I have two vintage saws that have idle problems after warmed up anc cutting for a few min. worn ring increases gap end when hot and loss of compression causes stall. Together we put a lot of effort into the maintenance of our gardens over the last few years, we become obsessed with it. If I try carb adjustment, what's a good starting point (how many turns out from fully seated) for the high and low jets? Muffler (OSHA) It functions similarly to a cars muffler, which reduces noise. Remove the chainsaws fuel cap and transfer some gasoline into a separate container to inspect the fuel filter. Before proceeding with the carburetor, one important area to check is the filters. 4-5 pulls with chock on, then it starts to run. As mentioned, push do not screw them in place. The saw is about 4 years old, but doesn't have 30 hours on it. Why it is getting hot and how to fix it so it will stay running. You never want to run your chainsaw without an air filter. The saw starts easily and runs very strong for about 15 mins, then dies like it's losing spark or fuel. End result? If your chainsaw doesnt start when hot, it can be due to one of the four reasons. Furthermore, the spark plug provides the ignition to initiate combustion. Tank vents prevent vapor lock formation. The carburetors jets could be clogged with fuel deposits. Also, open your fuel cap for some time and allow the pressure to equalize. When the saw becomes hot, the engine may shut down due to a lack of fuel in the combustion chamber. Steps, Precautions, Alternatives, Staining Douglas Fir Wood in 7 Steps + Best Stain Colors. Is this indicative of a good coil or should there be a strong blue spark? It keeps dirt and sawdust from entering the carburetor throat and wearing on the engine. The L screw is turned counter-clockwise one full turn. We and our partners use cookies to Store and/or access information on a device. Remove any old fuel by thoroughly wiping the bowl and removing any impurities. I already checked the fuel filter and gave it fresh fuel. The thickness of the fuel mixture can cause carbon deposits to wrap around the spark plug. 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