In colder temperatures, you can go a bit higher than a minute but avoid making it a regular practice as it may consume fuel unnecessarily. The problem could be a lack of air or a misfiring spark plug, and both of these problems are easy to check and remedy. Chainsaw Idle Adjustment. Tips from a Professional *A majority of STIHL gasoline-powered units sold in the United States are . Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. Fixed jet carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. This blog is written by a group of Garden Tool enthusiasts. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Poulan Pro chainsaw starts, idles extremely fast, but dies when I hit the gas. Bar Its the central piece that the chain circles around. That makes the chainsaw bog down. The proportion of fuel flowing out and air flowing in is equivalent. Most types follow a ratio of 40:1 or 50:1. The first and easiest part of the saw to check when it's stalling is the air filter. Changing the carburetor settings with a plugged muffler may result in the saw running to lean when the carbon build up is cleaned out. (3) If carburetor adjustment is required due to a new or rebuilt carburetor, it is best to start with the fuel adjustment settings one turn out. Similarly, turning the screw out causes the mixture to become rich due to a high fuel supply. Furthermore, extended idling intervals lead to increased fuel consumption and bar and chain oil. (7) Go back to step (5) and reset the idle speed. An over rich condition causes carbon buildup and will plug the fire screen and cylinder ports if run for a period of time. If the saw will idle let it run for a few minutes. Why Does My Chainsaw stall When I Give It Gas? 372xt won't stay running, dies in the cut, hard to start. Chainsaw races at idle Bad/old gas If your saw hasn't been used for a while, any remaining fuel in the tank will cause problems with the filter and fuel line. If youre adjusted too lean itll run out of gas and die, or die when accelerated. Or, these veins can be detached and replaced as well. Exciting insights to the work of professionals with chainsaws in the mountain forest can be found here: Heli-logging. It can also be damaged on the inside. If the saw will not idle, go to the next step. (6) Set the low speed fuel adjustment. You'll probably also find excess deposits on the spark arrestor. Keep turning the screw until the engine starts to load up. 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. Start with the air filter housing filter and air filter, and take off the bolts holding down the carb and gasket. The main reasons could be clogged or partially clogged fuel filters. Dirty or clogged air filters can stop the inflow of air. How To Troubleshoot And Adjust The Idle On A Chainsaw To perform the low-speed screw adjustment, follow the steps underneath: Following the low-speed adjustment, the chain may begin to rotate because the mixture is lean enough to engage the clutch. Chainsaw running out of control! Will not Idle! High idle! Air leak! This vein cannot have a leak and even the smallest dirt can block the vein. A fuel line blockage or a small crack in the fuel line can let air into the fuel line, and can cause fuel to leak, preventing your engine from running at full power. The fuel runs from the fuel tank to the carburetor through these veins. We were unable to add your email to our mailing list. 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. These saws have what is called a fixed jet which is set from the factory. 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. working, idle, and stop. Chainsaws | STIHL Check fuel line for holes or cracks. 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. Thus, the diaphragm wont be pulled inwards anymore. It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. 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. However, if the cap is loose and air flows in, it will cause the fuel to spill out. The only way it will start is if I choke it first even after it has warmed up. The chain should only spin when the throttle is pressed. Tips from a Professional. Definatley read up pressure and vac testing. If this adjustment is set too low, the engine will die when the throttle trigger is released. Craftsman Chain saw Model 358.360360 SN 05040D302320 Zama Carb C1M (also has W26 4YA stamped on the carb) Working on a friend's chain saw. 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 . Now that you can see the actual damage, the results of the P&C compression test arent too relevant. You can download Zama's technical manual from zama's website. Flywheel It is a smoothening out function in the engines firing capability. However, carburetors can become overfilled which causes them to break down. The "H" screw is for high-speed adjustment. A new chainsaw will be properly tuned, but over time the idle will need adjusting. When a clog occurs, your engine will not get enough air to operate effectively. Carburetor Adjustment ProcedureThe following procedure should be followed to insure proper carburetor adjustment: (1) Check the air filter and clean it if necessary. This form of idle helps to cool down an engine before shut down. If the engine dies while idling, the idle adjustment needs to be tightened. Keep turning the screw until the engine starts to load up. Before tuning the carburetor, make sure the air filter is clean and the spark arrestor is unclogged from carbon deposits. How Do You Fix a Chainsaw That Wont Stay running? Adjusting the carburetor with the air filter partially clogged is like adjusting the carburetor with the choke partially on. If your chainsaw engine dies at full throttle, check the following parts: the carburetor, fuel lines, fuel filter, air filter, and muffler. Make sure there's not too much smoke, that the engine purrs smoothly. Because your chainsaw will idle, but dies when it is revved up to full power, it means that the filter is only partially clogged; it will allow enough fuel to the engine to run on idle, but not enough to sustain full throttle. With time, your filter gets clogged with harmful particles. Your carburetor is tasked with mixing fuel and air in the correct ratio, so that combustion can occur, and your chainsaw will run. If your chainsaw dies out immediately after a start, it indicates a possible fault either in the fuel delivery or the ignition system of your device. A carburetor has three adjustment screws that are in chargeof controllingthe engines RPMs. 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. Dremel 8220 Vs 8260 (The Ultimate Showdown), Poulan Chainsaw Fuel Mix (Method And Ratio Chart), Spark Plug For Poulan Chainsaw (360 Guidelines), Poulan Chainsaw Carburetor Adjustment (Expert Insights), Primer Bulb Fuel Line Routing (For 2-Cycle Engines). Some manufacturers recommend never adjusting this screw more than turn either way. Your chainsaw wont run properly if the engine doesnt receive proper air. 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. 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. A mixture that is too lean will starve the engine and cause it to race or surge. When you press the throttle, the engine kicks off and the chainsaw starts looping. Turn it so you know where the lean and rich points are, and then find the medium between them. Stihl MS250 dies when I give it gas. | Arborist, Chainsaw & Tree Work Forum Like the air filter, it is an inexpensive part to replace, but greatly affects performance. This can also affect the airflow in the engine, causing it to stall. Gasoline with lower octane has higher levels of ethanol that disallows it to remain fresh for long. Chainsaw Buying Guide | Buying a Chainsaw | STIHL USA If your chainsaw has been in storage, the fuel may need to be replaced. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'thejimbosliceworkshop_com-banner-1','ezslot_7',111,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-banner-1-0'); And the chainsaw bogs down because of no filtration. Also, please be careful when you deal with dangerous equipment. No more running the saw or taking a hone to it until i know what the problem is and fix it. If you notice damage or corrosion, its time to abandon the maintenance and simply purchase a new carburetor, as this one is beyond repair. the fuel cap contains a one way duck bill valve. To adjust your carburetor screws without a dedicated adjusting tool, use a hacksaw to saw away the adjusting screws and create a rectangular slot. Open the carburetor, clean with an airline, or remove the dirt first. The choke is normally switched off after the engine runs. If that doesn't get the saw running smoothly, it's probably time to bring it in for servicing. Always run your saw idle for a few minutes and keep the tank half-filled to obtain optimum tuning results. High Speed Fuel Adjustment (marked H on carb, this is the high speed jet) This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. Carbon clogging the exhaust port or spark arrestor screen can cause a saw to run as if the carburetor requires adjustment. If the valve adjustment is too low, the valve inhibits the flow of air and fuel, causing the engine to shut down as soon as the throttle is withdrawn. Otherwise, it can further aggravate the dangers of using a chainsaw. PoulanPro. For easy comparison, view our Chainsaw Comparison Chart. If it is not available, consult your devices manualto determine the best setting for the H screw. Stihl MS880 runs at high idle then dies. | Arboristsite.com 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. Chainsaw Idles But Dies Throttle (8 Reasons + Fixes) 03:06. The whole metering diaphragm ensures that when the fuel is being used, the diaphragm gets pulled down. This could be caused by a combination of things. Using a flat head screwdriver, adjust each screw on the carburetor until a point is reached where the RPMs achieve an optimum value, which is neither too high nor too low. So when should you adjust the idle? Changing adjustments on one jet will often affect the other slightly. If too much fuel mixes with air, it runs "rich," and could choke up and bog down, produce excess smoke, or waste gas. Always check the condition of your filters. Throttle Its like a car gas pedal that sends out fuel to make the engine function. The sweet spot for the perfect idle is usually halfway between these two points. Chances are that the RPM setting has changed since you optimized the fuel mixture adjustment. (8) Set the high speed fuel adjustment. As a result, the air-fuel mixture becomes lean, and this can cause the engine RPMs to spike. 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. Next take off the primer bulb and cover, and make a note of how the lever, spring, and hinge pin go together on the inside of the carb. If your chainsaw often sputters and stops all of a sudden, instead of letting out a proper high-frequency noise whenever you push the throttle trigger, something is meddling with the engine's fuel combustion. Start with the air filter housing filter and air filter, and take off the bolts holding down the carb and gasket. An adjustment that is too lean will also produce insufficient power and is more likely to damage the engine through lean seizure. Your chainsaw can lose power when youre using it because of a dull chain, or insufficient lubrication. Its a huge mood killer, right? Have you tried backing out the idle screw? When you remove the old fuel, you should disassemble the fuel lines and spray them with carburetor cleaner to dissolve deposits. To replace the fuel lines, simply disconnect them from the fuel filter and the carburetor, and replace them with new ones. If that happens, the engine will demand fuel but wont receive enough. Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. In post #10, the picture of the carb you can see the remains of the black gasket on the top cover. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Find replacement chainsaw parts:https://www.repairclinic.com/Shop-For-Parts/a30/Chainsaw-Parts?TLSID=?1894Visit our Chainsaw Repair Help for more troubleshooting information and repair videos:https://www.repairclinic.com/RepairHelp/Chainsaw-Repair-Help?TLSID=?1894Chainsaw starts, then stalls? Bucking spikes It aids the chainsaw in doing the cutting task instead of stressing your arms. Your email address will not be published. Fix #4: Unclog the Air Filter. "Like magic. Other causes for a lean running condition include lack of oil in the fuel mix, and when the fuel tank runs empty. First, locate the "LA" screw. You should ask a professional to help you clean up the dirt or just get it changed. Now slowly turn the adjustment screw out and the engine should run better. Husqvarna Chainsaw Stalls at Idle-SOLVED | Power Tool Hunter As a result, the exhaust gases are high in carbon content which can clog the arrestor screens in the muffler. And the air filter is designed to protect the engine from polluted air. Have you peeked in the spark plug hole at the cylinder walls? Electric vs. Gas Chainsaw: Which One Is Better? However, avoid letting it rev for longer durations (such as 5 to 10 minutes or higher). May have to go back and forth between idle & L mixture screw. Sounds like a blocked passage somewhere to me. The diaphragm and its valve get rough and fussy over time. Since it was at the top of carb and it own , I thought it was some kind of emissions part and that air would be coming out of the opening not air going in. 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. Like a fuel filter, it screens the ambient air before reaching the carburetor. Its because it gets air locked inside the tank. If you put away pressure from the throttle, the chainsaw will stop. Different filters may have different care suggestions, but many will be easily cleaned with warm, sudsy water once you've tapped off any excess dirt and debris. All rights reserved. If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. Hold the trigger wide open and check the RPM with the tachometer. If this seems like the right setting, it's probably wise to take the chainsaw into the shop for some maintenance. Tool to Adjust a Poulan Carburetor to High and Low Settings Afterward, you can use a readily available flathead screwdriver to adjust the screws as you want. Adjust "LA" idle screw: Next, while the chainsaw is idle, make sure the chain is not moving. Now slowly turn in the screw to a position where it idles the best. Chainsaw idle adjustment. An idle run ensures that the engine temperature gets normalized. Your chainsaw is said to be idling when the engine is on and the throttle isn't pressed. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. It also identifies the three adjustment screws and their function. Hunker may earn compensation through affiliate links in this story. When I first worked on the carb, I noticed The Airhead Throttle was moving back and forth without any resistance. Cleaning and potentially replacing your fuel filter should be part of routine maintenance for your chainsaw. Off topic but did you know mike sorrentino before he got big? The air filter is under a cover on the engine housing, and the spark arrestor is between the exhaust port and the muffler. However, at times they malfunction and the fuel cant reach the carburetor. Ok, so $35 on ebay for a new 60mm piston kit and cross my fingers that i can salvage the cylinder. Chainsaw Dies When I Give It Gas | Backyard Mike With frequent use, the chainsaw deposits carbon in the muffler. If it will not maintain idle without stalling warm it up by repeatedly squeezing the throttle, do not run the throttle to wide open. This could cause your saw to overheat and is likely to damage your piston rings or seals. nous utilisons les cookies afin de personnaliser le contenu et les publicits, de fournir des fonctionnalits pour les rseaux sociaux et analyser notre traffic. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. - My Poulan Pro chainsaw (Model # PP4218AVX) starts OK, but on half choke it runs extremely fast, and when I hit the gas, or kill the choke, it dies immediately. Know that there can be more reasons why your. 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. 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. Make a mental note of the position of the screwdriver slot. It can also happen if the carburetor is overfilled. Worn crankcase seals and malfunctions of moving parts inside the engine itself can cause stalling. 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. You must log in or register to reply here. If the engine doesn't stall until you depress the throttle, tighten either the low-or high-speed adjustment screw to improve performance. Homeowner Chainsaws - Mid Range Chainsaw Features | STIHL USA Since chainsaws are air-cooled, idle runs after full-throttle provide sufficient time for the high engine temperatures to fall. If i can i will try to maybe post videos or pics. 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. So if your chainsaw bogs, know that it isnt receiving enough fuel. Direct replacement, pull chain cover, tap on clutch with hammer/brass rod to break it loose, unscrew, remove drum, install new drum after inspecting bearings, screw on clutch, re-install cover (with bar and chain in place naturally). The muffler gets clogged. On right-handed chainsaws, the idle screw tends to be on the left. 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. The partially burned mixture is expelled into the muffler and exits the saw as smoke. Restoring the needle and seat contact areas in your carburetor Required fields are marked *. Uh oh, I took the saw apart today and here is what i found: [video=youtube;2n59Jj849b4]http://www.youtube.com/watch?v=2n59Jj849b4[/video]. If you fail to improve performance by replacing filters or adjusting the carburetor. With time, your filter gets clogged with harmful particles. You'll either tweak a single screw or three separate ones, but the premise is the same in both instances. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. Check the fuel filter and tank for crud. Thanks for the advice guys. There are several factors may make your saw not work properly. All rights reserved. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. I've used To troubleshoot your chainsaw, use the following step-by-step approach: Step 1: Air Filter: We can easily inspect the air filter before examining the carburetor, which could be causing the chainsaw to stall. Decompression valve It can only be found on some saw models. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. Or, the carburetor adjustment might have simply slipped. Low Speed Fuel Adjustment (marked L on carb, this is the low speed jet)- This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at idle speed.