If your chain does not rotate, skip this step and go to the next. Save my name, email, and website in this browser for the next time I comment. Restoring the needle and seat contact areas in your carburetor These types of carburetors have never worked well. Your chainsaw is said to be idling when the engine is on and the throttle isn't pressed. Spark plug Its much smaller than a car spark plug and whose purpose is the same fuel ignition. Carburetor adjustment is critical on chain saws and other two-cycle engines. Also, you should check your air filters and fuel filters. Chainsaw idle adjustment. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. Powered by Shopify and made by Reconfigure, Copyright 2023 Chainsawr All prices USD - Policies - Privacy, Adjustment and Tuning of a Chainsaw Carburetor, Fiberglass Repair of Plastic Chainsaw Parts, How to Remove a Chainsaw Flywheel Without Special Tools, How to Test a Chainsaw Ignition for Spark. When gasoline is left standing in the fuel lines and carburetor, it partially evaporates, leaving behind a varnish-like substance that clogs the fuel system. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Now you noticed that your Chainsaw idles but dies throttle. When fully tightened, it inhibits fuel from entering the carb, resulting in a lean running engine. If this seems like the right setting, it's probably wise to take the chainsaw into the shop for some maintenance. Then we adjust it lean causing it to sound smoother and then it starts to starve, also creating little power and creating a LOT of heat. If the chainsaw won't stop spinning when idling, or it's smoking when it idles, it's getting too much fuel and running rich, so you'll need to back it down a bit. These T-head timing screws are extremely sensitive to turning, so work at most with quarter-turn increments with your flat-head screwdriver on the T-screw, and make mental notes as you go. The fuel filter is supposed to terminate polluted fuel from flowing into the engine. Be sure to use the correct gasoline:oil mixture ratio recommended for your chainsaw.Most Chain Saw Engines Have Three Carburetor Adjusting Screws:1. Pull cord Its the chainsaws startup mechanism. To prevent this malfunction, you can just loosen the tank cap a bit to allow slight air in. An idle run ensures that the engine temperature gets normalized. There is a piece called an Airhead that fits on the outside of the carb. 372xt won't stay running, dies in the cut, hard to start. The proportion of fuel flowing out and air flowing in is equivalent. A carb kit can be purchased to help clean and rebuild a plugged carburetor. Have you tried backing out the idle screw? Then continue to turn it counter-clockwise 1/4 turn further. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'thejimbosliceworkshop_com-medrectangle-4','ezslot_1',109,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-medrectangle-4-0');With time, your filter gets clogged with harmful particles. Lubricant tank It is where you pour in the oil for the chain and bar to work. The L (low) and H (high) adjustment screws on a chainsaw govern the fuel flow at low and high RPMs, respectively. Thanks for the advice guys. Its at this point youll need to look out for corrosion or wear on the internal parts of the carburetor. An adjustment that is too rich will cause a saw to smoke, have insufficient power, result in additional carbon build up and may damage the engine. For easy comparison, view our Chainsaw Comparison Chart. Adjusting the carburetor with the air filter partially clogged is like adjusting the carburetor with the choke partially on. Now that you can see the actual damage, the results of the P&C compression test arent too relevant. Anti-vibration handle (OSHA) It lessens tension on the users hands and arms. For a better experience, please enable JavaScript in your browser before proceeding. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. The air filter is under a cover on the engine housing, and the spark arrestor is between the exhaust port and the muffler. To do this, detach your carburetor from the chainsaw and fix it on a bench vise. Always stop a saw before the tank runs completely dry. This ensures our chainsaws meet our standards in design and performance - standards that have made STIHL the clear choice for professionals and homeowners, making STIHL . Then we go rich and hear the saw start to blubber and the RPMs drop, almost to a point where it dies. Generally speaking, the more power your chainsaw requires, the more fuel it will burn. So when should you adjust the idle? Apart from idling at startup, it is also good to let your chainsaw idle after an extended operation. First, it could be that the carburetor, spark arrestor or the air filter are dirty. If you fail to improve performance by replacing filters or adjusting the carburetor. The sprocket enables the chainsaw to spin. You can waste a lot of time chasing an air leak by just pulling parts off but a low pressure air supply hooked to a properly blocked off engine will show up the air leak or leaks by just spraying all known leak areas with soapy water. Try to set the speed at about 2700 RPM. Troubleshooting: does the idle need adjusting? If that doesn't get the saw running smoothly, it's probably time to bring it in for servicing. A chainsaw troubleshooting guide, Why your chainsaw chain keeps coming loose. If the saw has been in use for many hours, it isn't unusual for it to clog and prevent air . How to Adjust the Carburetor on an Eager Beaver Chainsaw, The Toro Push Lawnmower Does Not Turn Over, Chainsawr: Adjustment and Tuning of a Chainsaw Carburetor, Beautiful houseplants that also repel mosquitoes, cockroaches and other pests, My Kawasaki Mower Engine Backfires When Starting. Sounds like a blocked passage somewhere to me. This video provides information on how to troubleshoot a chainsaw and the most likely defective parts associated with this problem.Commonly replaced chainsaw parts:ChainChain BarControl CableStart PulleyPull RopeGas TankFuel LineThe information provided in this chainsaw troubleshooting video is applicable to all chainsaw brands: Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-ManConnect With Us!https://plus.google.com/+repairclinichttps://www.facebook.com/RepairClinichttps://www.twitter.com/RepairClinichttp://pinterest.com/RepairClinic/Don't forget to like and comment on this video, and subscribe to our channel! I will also show how to adjust the H and L screws on a carburetor, how to do this without a tool, and explain if it is fine to let a chainsaw idle. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. How to repair a chainsaw that dies when you give it gas 1. Most chainsaws either have too high or low RPMs at an idle state. Ok so today I went out to pursue a great find on CL, a nice ms 880 for $650 (I was set on finding a 660 for that price). Your email address will not be published. A Poulan chainsaw won't stay running if the air filter is dirty or has a buildup. Always check the condition of your filters. Was it full of junk? While the air filter protects it from airborne particles, the fuel filter protects it from particles found in the fuel. A dirty air filter -- which filters air coming through the intake port -- or spark arrestor -- which filters the exhaust -- impedes air circulation and kills the engine. Adjust "LA" idle screw: Next, while the chainsaw is idle, make sure the chain is not moving. Dont worry read till the end to clear out your doubts and fix them! Like said before check cylinder condition. A lean condition also allows for excessive RPM which often leads to big end rod bearing failure. If it is not available, consult your devices manualto determine the best setting for the H screw. Most types follow a ratio of 40:1 or 50:1. (7) Go back to step (5) and reset the idle speed. There are several factors may make your saw not work properly. All these factors can affect your chainsaw and it dies after you oil it. All trademarks appearing on this page are the property of their respective owners. Your carburetor is tasked with mixing fuel and air in the correct ratio, so that combustion can occur, and your chainsaw will run. -Clever Jeff . If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. Also, you can try using 10w40 chainsaw bar oil.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'thejimbosliceworkshop_com-large-leaderboard-2','ezslot_8',112,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-large-leaderboard-2-0'); This is mostly because of poor carburetor adjustment. However, carburetors can become overfilled which causes them to break down. But when it is further ignited, the chainsaw dies. Always run your saw idle for a few minutes and keep the tank half-filled to obtain optimum tuning results. But if the carb itself is damaged or corroded internally, which you will notice while you tear it down with your carb kit, you will need to replace it. Too lean adjustment can make your chainsaw stall. To adjust the carburetor idle speed, locate the idle speed screw labeled with a "T" just above the primer bulb. If it slows down then a linkage or sometihng is binding or bent. I've never worked on a Zama C1M carb. The Fix App makes it easy to manage all your stuff in one place. It cant be allowing both in or both out. Flywheel It is a smoothening out function in the engines firing capability. For a better experience, please enable JavaScript in your browser before proceeding. Why Cant Carbs Be Set When They Are New & Then Leave Them Alone?Some people wonder why their saw cant be adjusted when its new and then not need any other tuning. If the chainsaw continues stalling, the issue might be with the low-speed and idle screws, which you will need to adjust. Unfortunately, they also often prohibit the saw from achieving maximum performance. Register today and take advantage of membership benefits. Chances are that the RPM setting has changed since you optimized the fuel mixture adjustment. (8) Set the high speed fuel adjustment. should i try it without touching the cylinder first or could that kill the new piston i put in it? However, the basic reason is mostly because of insufficient fuel supply to the engine. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'thejimbosliceworkshop_com-leader-1','ezslot_11',104,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-leader-1-0');The Diaphragm is designed to bring in the needful fuel into the inlet of the carburetor. By screwing the cap on you somewhat pressurize the tank. Clean the internal parts of your carburetor now with A carb kit can be purchased to help clean and rebuild a plugged carburetor. This is the control for air/fuel mixture when you're running the saw at high-speeds or during cutting. If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. The optimum setting is between these two extremes. Also it is now hard to start. All of a sudden your chainsaw starts malfunctioning. Well, still not sure whats happening. I used it yesterday for 30 minutes perfectly. +1-213-221-0119, By using this website I agree with the Disclaimer. I have experience using power tools for a variety of tasks such as construction, household, gardening, cleaning, etc. A carburetor kit will helps with this. You may have to remove the carburetor, disassemble it, clean each part with carburetor cleaner and rebuild it. Make sure you change your filters as soon as you face the problem. If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. It may not display this or other websites correctly. Most chainsaw users may not have this tool at hand. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. Its because it gets air locked inside the tank. If the carburetor is adjusted when the fuel tank is nearly empty, the carburetor may be adjusted too rich when the fuel tank is filled. (5) Start the engine and warm it up. #1, check to see if the throttle is closing completely. Fix #4: Unclog the Air Filter. Yet there are now newer battery-powered and electric models. Take note of where the screw is when it runs lean or rich. This can further lead to engine stall issues. McCulloch. Worn crankcase seals and malfunctions of moving parts inside the engine itself can cause stalling. Engine Gas-powered chainsaws are still regarded as the standard. Your chainsaw wont run properly if the engine doesnt receive proper air. If the engine dies while idling, the idle adjustment needs to be tightened. The fuel runs from the fuel tank to the carburetor through these veins. However, when some chainsaw engines are starved of fuel and run leaner than usual, they can only be kept runningby keeping the choke on. Things might be a little more complicated if the problem is related to fuel delivery or to the composition of the fuel itself. The guy said the reason for the low price was that the saw would start but would not idle, it would just rev up to half throttle, sputter and then quit, I figured simple enough just a little tweaking and I could get it running strong again, probably a carb issue. Furthermore, extended idling intervals lead to increased fuel consumption and bar and chain oil. With all three of these screws, you'll follow the same process as for the single-screw timing adjustment. The reason is that elevation, fuel type, fuel age, humidity, wearing components on the saw and a host of other factors cause carburetors to need periodic adjustment. A pressure vac test will check the case for leaks, the "compression" test will test the compression achieved by the piston and cylinder. It will also lack power in the cut and tend to run very hot.The preceding information briefly explains rich and lean running conditions. Will not Idle! We were unable to add your email to our mailing list. Check fuel line for holes or cracks. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'thejimbosliceworkshop_com-box-4','ezslot_4',110,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-box-4-0');Best if you replace the fuel pump. If the engine doesn't stall until you depress the throttle, tighten either the low-or high-speed adjustment screw to improve performance. This is screw is critical to be careful with, because setting it too lean or rich can cause serious engine damage. Please remember that a lean fuel mixture raises the maximum engine temperature by increasing the engine RPMs. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Reason 4: Rough and Fussy Fuel Pump Diaphragm. Check the Filters. It causes the same problems and brings in unnecessary air. Its a tear on the manifolds body. In addition to low power, a lean condition causes the cylinder temperature to rise, which often leads to seizure. What youll hear is an idling saw. Afterward, you can use a readily available flathead screwdriver to adjust the screws as you want. It also identifies the three adjustment screws and their function. These saws have what is called a fixed jet which is set from the factory. Haha im getting nervous here. The built-up gas gets stuck inside and harms the chainsaw further. Why Does My Stihl Chain Saw Bog Down When I'm Cutting. May have to go back and forth between idle & L mixture screw. If the saw will not idle, go to the next step. (6) Set the low speed fuel adjustment. Each is considered a top old chainsaw brand in its own right. If the saw will not idle and dies, the nthe low speed jet may need to be adjusted. The screw essentially controls the butterfly valve, which controls the amount of air-fuel mixture entering the engine for combustion at an idle state. The diaphragm and its valve get rough and fussy over time. You might see that your chainsaw functions on idle but hesitates or dies when throttled. Low and high adjustment Its function is to control the saws idling speed. When you remove the old fuel, you should disassemble the fuel lines and spray them with carburetor cleaner to dissolve deposits. The correct carburetor adjustment will allow the saw to produce maximum power, extend the duty cycle of the engine, produce minimal smoke, idle smoothly, rev up nicely and give trouble free service.An over rich carburetor adjustment is when the proportion of fuel in the combustible air/fuel mixture is so high that the fuel does not burn well. 453 S Spring St Ste 1508 When your chainsaw is running, fuel will travel from the fuel tank to the carburetor through the fuel lines. There could be multiple reasons why your chainsaw dies. The fuel may also have moisture in it, and the moisture mixes with ethanol in the gasoline and settles at the bottom of the tank, which is where the fuel line is located. In this blog post, I shall discuss everything you need to know to optimize your chainsaw's idle condition.