The chainsaw stalls at high speeds In the event that the tool stalls at high rpm, there are three parts to check: the air filter, the fuel pump and the gasoline filter. Following are some possible causes of this issue: Pro Chainsaw Sharpener. A Poulan chainsaw won't stay running if the air filter is dirty or has a buildup. Stihl MS880 runs at high idle then dies. Always check the condition of your filters. This is critical because a chain rotating at idle is extremely dangerous. An adjustment that is set too rich will cause the engine to load up and die at idle speed. If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. Better safe than sorry! I used it yesterday for 30 minutes perfectly. That may require raising the idle up to prevent the engine from dying. 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. Chain Saw: Starts, Runs For A While, Then Dies Check the ignition coil, gasket, cylinder, and other parts listed in our repair and symptom guide, if your chainsaw engine runs for a while then dies. In that case, there is a rather simpler technique for making the screw adjustment. 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. The last thing anyone wants is a saw that purrs when idling and bogs down when applying gas. Los Angeles, CA 90013 Pull cord Its the chainsaws startup mechanism. Add a fuel stabilizer. Afterward, you can use a readily available flathead screwdriver to adjust the screws as you want. Plus, as I mentioned beforehand, an imbalance in the air and fuel ratio disrupts the chainsaws operation and it dies down. This form of idle helps to cool down an engine before shut down. Stihl MS880 runs at high idle then dies. | Arboristsite.com There is a piece called an Airhead that fits on the outside of the carb. 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. With time, your filter gets clogged with harmful particles. A chainsaw should only idle for a few minutes to warm up the engine and the cutting chain. If the Stihl chainsaw does not keep speed and stalls idling, you can be almost 90% sure that it has a violation in the fuel pump system, as a rule, it is the air leaking into the crankcase through the gasket of the sump, or, much more often, through the oil seals crankshaft. Now you noticed that your Chainsaw idles but dies throttle. Most time problems like this are signs that the carburetor diaprams are getting stiff and the carb needs to be rebuilt. A carburetor kit will helps with this. Like a fuel filter, it screens the ambient air before reaching the carburetor. These types of carburetors have never worked well. There are several factors may make your saw not work properly. Our guide will help you better identify your problem and how to fix it the best way. Dirty or clogged air filters can stop the inflow of air. On the other hand, the idle RPMs may increase if this adjustment is set too high.This is dangerous since the high RPMs will engage the clutch, forcing the chain to run even when the throttleis not held. It is not the gas. A chainsaw troubleshooting guide, Why your chainsaw chain keeps coming loose. Did you clean the screen in the carb? This seemed kind of strange to me, the saw obviously has decent compression (nearly ripped my fingers off trying to start it) The dealer told the guy $700 to replace the piston and cylinder to get the saw running again. All these factors can affect your chainsaw and it dies after you oil it. It can cause the chainsaw to get insufficient air and too much fuel. While the air filter protects it from airborne particles, the fuel filter protects it from particles found in the fuel. Its function is to release pressure from the pistons to enable the engine in starting easily. Husqvarna. Start by adjusting this screw as you would for the single-screw carbs. Husky idles up, dies when grab throttle | Arboristsite.com Fix your Lawnmower with our Lawnmower Troubleshooting tool. Keep turning the screw until the engine starts to load up. Using the screwdriver, set the screw to an optimum point at which the chainsaw neither dies at idle, nor the RPMs are high enough to engage the chain. Your email address will not be published. When the RPMs are too high, it can be pretty dangerous as the chain can get engaged. Carburetors mix fuel and air to run the engine. Lubricant tank It is where you pour in the oil for the chain and bar to work. The air filter is under a cover on the engine housing, and the spark arrestor is between the exhaust port and the muffler. May have to go back and forth between idle & L mixture screw. It's best to check the owner's manual, or do a web search for your make and model, to ensure you've found the proper screw or screws to adjust. *A majority of STIHL gasoline-powered units sold in the United States are . It can also be damaged on the inside. These properties minimize the burden for man and the environment. This is typically the case when the H adjustment screw is fully loosened. Carburetor Adjustment ProcedureThe following procedure should be followed to insure proper carburetor adjustment: (1) Check the air filter and clean it if necessary. Chainsaw runs full speed when first starting and won't idle. Just dies Dont worry read till the end to clear out your doubts and fix them! Register today and take advantage of membership benefits. Chain Saw: Engine Will Idle But Dies At Full Throttle If your chainsaw engine dies at full throttle, check the following parts: the carburetor, fuel lines, fuel filter, air filter, and muffler. (Note that a saw adjusted too lean on the high can also die when accelerated.) Haha yeah between the tolls and the gas thats like 50 bucks extra right there. May have to go back and forth between idle & L mixture screw. However, carburetors can become overfilled which causes them to break down. Like the air filter, it is an inexpensive part to replace, but greatly Like the air filter, the fuel filter is designed to protect the engine from dirt and debris. You can download Zama's technical manual from zama's website. 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. Finally, if the chainsaw stalls out and dies when it's working under a load, that's usually an idle problem as well. Now that you can see the actual damage, the results of the P&C compression test arent too relevant. Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. 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. Replacing it would always be the better choice. While using it yesterday it reved up and stalled. The air filter in your chainsaw protects your chainsaw from dirt and debris by filtering it out before it can reach the engine. Sounds like a blocked passage somewhere to me. Chainsaw running out of control! Will not Idle! High idle! Air leak! I have been working with power tools for over 10 years. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. An over rich condition causes carbon buildup and will plug the fire screen and cylinder ports if run for a period of time. 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. This also makes a weak power stroke and causes the saw to have insufficient power. Similarly, turning the screw out causes the mixture to become rich due to a high fuel supply. Troubleshooting: does the idle need adjusting? PoulanPro. What youll hear is an idling saw. If your chainsaw stalls instead of producing the reassuringly high-pitched sound of a healthy engine when you press the throttle trigger, something is interfering with efficient fuel combustion. Cleaning and potentially replacing your fuel filter should be part of routine maintenance for your chainsaw. An engine running on a rich fuel mixture, on the other hand, reduces its RPMs significantly. 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. Its best to have a digital tachometer on hand to indicate the engine RPMs when adjusting your high-speed screw. To adjust the carburetor idle speed, locate the idle speed screw labeled with a "T" just above the primer bulb. 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. Its at this point youll need to look out for corrosion or wear on the internal parts of the carburetor. The chainsaw will die. nous utilisons les cookies afin de personnaliser le contenu et les publicits, de fournir des fonctionnalits pour les rseaux sociaux et analyser notre traffic. Just snap a photo and we'll find and store your user manuals, receipts, and product information in one easy-to-find place! After some gentle scrubbing and a rinse with clean water, let it dry, and the filter should be as good as new. It also identifies the three adjustment screws and their function. To find out your starting point, fire up your chainsaw and get a flat-head screwdriver ready. Throttle Interlock It keeps misuse and accidents for occurring. If you start the chainsaw easily, and it runs smoothly, the idle's doing just fine and there's no need to tinker with it. The jersey shore guy? Carburetor adjustments made on a cold engine will be too rich when it reaches normal operating temperature. (5) Begin by setting the idle speed. They dont understand that saws cant be set at the factory and stay correctly adjusted for the life of the saw. 03:06. The built-up gas gets stuck inside and harms the chainsaw further. This is a description of why the run the way that. And the air filter is designed to protect the engine from polluted air. High and Low Speed Adjustments. It is also helpful to be able to adjust the carburetor for a variety of applications; chainsaws installed on chainsaw mills for example should have their high speed adjustments set rich because of the type of stress on the saw. That is what needs to be done before you tear it apart, do a vac test or go straight to a low air pressure test and find the source of the leak. 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 chainsaw wont run properly if the engine doesnt receive proper air. When such a clog occurs, the exhaust gasses will not be able to exit the engine, and it will cause your chainsaw to die. Now slowly turn the adjustment screw out and the engine should run better. Like all STIHL chainsaws, they feature German engineering and advanced technology. Ensure the chain comes to a stop when the engine idles. The "L" screw is for low-speed adjustment. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. The sprocket enables the chainsaw to spin. Thread . Why does my chainsaw start and dies? Most chainsaws either have too high or low RPMs at an idle state. Most chainsaws either have too high or low RPMs at an idle state. Problem fixed temporarily. Or maybe gas varnish in the screen filter at the base of the metering needle. When dismantling your carburetor for rebuilding, its a good idea to take photos as you go, to make reassembly easier. Your chainsaw wont run properly if the engine doesnt receive proper air. Hence, idling a chainsaw for too long does more harm than good. With the dust, dirt and oil chainsaws are routinely exposed to, experts recommend cleaning filters after five hours of run-time. Engine Gas-powered chainsaws are still regarded as the standard. However, at times they malfunction and the fuel cant reach the carburetor. Why Does My Stihl Chain Saw Bog Down When I'm Cutting. If your carb has three screws to tweak, you'll see labels. When I first worked on the carb, I noticed The Airhead Throttle was moving back and forth without any resistance. However, the basic reason is mostly because of insufficient fuel supply to the engine. If your saw dies at idle, turn the idle screw clockwise until the chain just starts to move. Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. Decompression valve It can only be found on some saw models. An important part of diagnosis of engine stalling is to remove and examine the spark plug. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. In addition to low power, a lean condition causes the cylinder temperature to rise, which often leads to seizure. Plus, the air will basically fill up for the empty space. For a better experience, please enable JavaScript in your browser before proceeding. Chainsaw Starts but then Dies. Tips from a Professional First, it could be that the carburetor, spark arrestor or the air filter are dirty. Select gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%. With frequent use, the chainsaw deposits carbon in the muffler. Check the fuel filter and tank for crud. Its job is to pump fuel, so when the diaphragm is stiff, the fuel cannot rush through. The Top 9 Old Chainsaw Brands - Upgraded Home A carburetor has three adjustment screws that are in chargeof controllingthe engines RPMs.