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But you have to find out whats wrong with your chainsaw. This is a general guide for your repair; for more detailed information on your model, refer to the owners manual. Never set the idle so the chain runs when the throttle is released. The burn does not produce much heat, so the power stroke is weak. Or, these veins can be detached and replaced as well. For a better experience, please enable JavaScript in your browser before proceeding. Chainsaws | STIHL Use a 50:1 gas-to-oil mixture in your 2-cycle Husqvarna chainsaw. These seats are delicate and if they are damaged, the carburetor has to be replaced. (4) Check the fuel level. 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. 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. Tips from a professional. After some gentle scrubbing and a rinse with clean water, let it dry, and the filter should be as good as new. While using it yesterday it reved up and stalled. 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. This time dial the idle speed screw back to the lowest rpm where the saw will idle smoothly without seeming as if it will stall out. Your saw is properly adjusted and ready for work. Your chainsaw can lose power when youre using it because of a dull chain, or insufficient lubrication. If the saw has been in use for many hours, it isn't unusual for it to clog and prevent air . This can result in one or more of these parts becoming clogged. On many chainsaw models, you can control the amount of fuel that the carburetor sprays into the combustion chamber by turning one of its adjustment screws. JavaScript is disabled. Manifold damage can happen when its used for a long time. As mentioned above, the carburetor comprises three screws (H, I, L) for managing the entire RPMs at high, idle, and low speeds. Poulan Chainsaw Won't Stay Running: Troubleshooting Tips [2023] Put in ultrasonic cleaner. The comp is low on that saw and the sound of it running tells its running lean.Don`t run it any more in that condition. These types of carburetors have never worked well. Take care when removing the fuel lines with a twisting and pulling motion, and take off the carburetor linkage. If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. If dirty and clogged, remove the air filter from its bay, soak it in warm water with soap and . I would always recommend running a chainsaw at idle for some time before going full throttle. *A majority of STIHL gasoline-powered units sold in the United States are . Thus, it helps the engine to relieve some torque and saves fuel/electricity. STIHL chainsaws have many more features, including anti-vibration technology for enhanced comfort. Chainsaw Idles but won't Rev. Tips from a Professional As a result, the air-fuel mixture becomes lean, and this can cause the engine RPMs to spike. The "L" screw is for low-speed adjustment. Thread starter chad556; Start date Feb 26, 2011; 1; 2; 3 . This is the control for air/fuel mixture when you're running the saw at high-speeds or during cutting. Reason 4: Rough and Fussy Fuel Pump Diaphragm. Now you noticed that your Chainsaw idles but dies throttle. All these factors can affect your chainsaw and it dies after you oil it. Its best to have a digital tachometer on hand to indicate the engine RPMs when adjusting your high-speed screw. STIHL supplies chainsaws in a variety of equipment versions and for all purposes, with power ratings from 1.3 kW to 6.4 kW (1.6 HP to 8.7 HP). The chain should only spin when the throttle is pressed. Some manufacturers recommend never adjusting this screw more than turn either way. I have seen/taken apart a couple pistons and clyinders but i havent really seen much of what scoring looks like first hand. Idle screws and high and low screws needs fine-tuning, Greenworks 20262 12-Inch Electric Cordless Chainsaw Review, How to put a chain back on an electric chainsaw without any difficulty, How to port a chainsaw and increase its cutting power, How to Start a Chainsaw for the First Time, How to Pick the Perfect Pressure Washer Wand, Choosing an outboard motor for your small boat, How To Choose the Best Snowblower For You. However, avoid letting it rev for longer durations (such as 5 to 10 minutes or higher). Getting ready to tweak the carburetor idle, How to Adjust the Carburetor on a Stihl FS 36 Trimmer, The Pro Cutter: How to Adjust a Chainsaw Carburetor, Hyundai Power Equipment Co: Adjusting the Carburettor on a Hyundai chainsaw, Trinity Mower Center: How to Tune a Husqvarna Chainsaw. Take care when removing the fuel lines with a twisting and pulling motion, and take off the carburetor linkage. Chainsaw runs full speed when first starting and won't idle. Just dies Changing adjustments on one jet will often affect the other slightly. Carburetor adjustment is critical on chain saws and other two-cycle engines. That may require raising the idle up to prevent the engine from dying. If the chainsaw continues stalling, the issue might be with the low-speed and idle screws, which you will need to adjust. And the air filter is designed to protect the engine from polluted 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. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. Why Does My Chainsaw Lose Power When Cutting? If the cylinder does need to be honed a little though (or replaced) how will i know? Better safe than sorry! Saw does not even appear to want to idle at low. 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. Electric vs. Gas Chainsaw: Which One Is Better? Start with the air filter housing filter and air filter, and take off the bolts holding down the carb and gasket. Craftsman Chain Saw - Revs very, very high on idle When dismantling your carburetor for rebuilding, its a good idea to take photos as you go, to make reassembly easier. MS271 runs/idles great but dies at the trigger. Engine Gas-powered chainsaws are still regarded as the standard. If your chain starts to rotate, loosen the idler screw until it stops. Save my name, email, and website in this browser for the next time I comment. If you're not confident about your adjustments, or you notice performance issues with cutting or idling after the fact, it can be dangerous to use the chainsaw. 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. Always stop a saw before the tank runs completely dry. Chain Its the most important piece of the device, which does the cutting. I'll keep you posted what I find out. Gasoline with lower octane has higher levels of ethanol that disallows it to remain fresh for long. This is a description of why the run the way that. You can download zama's technical manual from zama's website. You may be able to purchase a carb kit, and clean and rebuild the carb, rather than replacing it. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. No more running the saw or taking a hone to it until i know what the problem is and fix it. Its at this point youll need to look out for corrosion or wear on the internal parts of the carburetor. This controls the air/fuel mixture when it's idling, or resting at lower speeds. If this adjustment is set too low, the engine will die when the throttle trigger is released. You can download Zama's technical manual from zama's website. There is a reason that piston is scored up that way, you need to find out what caused it, my bet is an air leak. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. There might be issues with the spark plugs or the issues with the oil that you are using in your chainsaw, problems with carburetors, and unclean filters. The STIHL Quickstop chain brake system is designed to stop the chain in a fraction of a second and can be activated by inertia in the event of kickback. Idle Speed/Throttle Stop This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. Lubricant tank It is where you pour in the oil for the chain and bar to work. This also makes a weak power stroke and causes the saw to have insufficient power. should i try it without touching the cylinder first or could that kill the new piston i put in it? The "H" screw is for high-speed adjustment. Stihl MS880 runs at high idle then dies. It will just run full speed right after it starts and once I can get it to settle I have to throttle it to keep it running. first question is are you in tree cutting business? I will check all this stuff when I get it back into the shop tomorrow. But before all that I will figure out how to do a pressure and vac test to diagnose and correct possible air leak problem? 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. They dont understand that saws cant be set at the factory and stay correctly adjusted for the life of the saw. If a chain spins at idle, it can be due to the following underlying factors: When a chainsaw only runs ona choke, the fault is likely in the fuel delivery system, including the fuel filter, fuel lines, and carburetor. Changing the idle on a chainsaw carburetor isn't complicated, but getting the right mix can take practice. Most chainsaws either have too high or low RPMs at an idle state. Haha im getting nervous here. Your chainsaw wont run properly if the engine doesnt receive proper air. However, when some chainsaw engines are starved of fuel and run leaner than usual, they can only be kept runningby keeping the choke on. It cant be allowing both in or both out. Do not attempt to set at maximum RPM levels without a tachometer. The tank should be over half full. It is recommended to let your chainsaw idle for a minute or so just after starting the engine and before shutting it off after a run. A clogged air filter will complicate any attempt to adjust your idle. Stihl MS880 runs at high idle then dies. | Arboristsite.com An adjustment that is too lean will also produce insufficient power and is more likely to damage the engine through lean seizure. All of a sudden your chainsaw starts malfunctioning. Check the fuel filter and tank for crud. If the engine dies while idling, the idle adjustment needs to be tightened. This can be quite dangerous as the chain might damage anything in its vicinity immediately after the cord is pulled. Dirty or clogged air filters can stop the inflow of air. When dismantling your carburetor for rebuilding, its a good idea to take photos as you go, to make reassembly easier. Adjustment and Tuning of a Chainsaw Carburetor Clockwise is generally the direction you turn to make the mixture leaner, and counterclockwise usually makes it richer. He could not get it to start. Know that there can be more reasons why your chainsaw idles but dies throttle. To find out your starting point, fire up your chainsaw and get a flat-head screwdriver ready. 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. It may not display this or other websites correctly. Outside of carburetor adjustments this can also be caused by having too much oil mixed with the fuel, and/or old stale gasoline.A lean carburetor adjustment is when the proportion of fuel in the combustible air/fuel mixture is so low that there is not enough fuel to burn.