chainsaw idles high then dies chainsaw idles high then dies

McCulloch. Not to mention, your clutch bearing wears out at an accelerated rate. With the carb apart, make sure all the passages are clear. 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. Then, the filter is usually easy to lift off its seat. Was it full of junk? 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. Well, still not sure whats happening. This is a dangerous condition and should never be allowed.2. - 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. If it slows down then a linkage or sometihng is binding or bent. If your chainsaw has been in storage, the fuel may need to be replaced. On the chainsaw, it is denoted by the letter H. This setting controls how much fuel enters the carburetor when the throttle is held. If it's accelerating too slowly, or sputters and jumps erratically when idling, it's got too little fuel and needs more. 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. It causes the same problems and brings in unnecessary air. I have seen/taken apart a couple pistons and clyinders but i havent really seen much of what scoring looks like first hand. 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. When I first worked on the carb, I noticed The Airhead Throttle was moving back and forth without any resistance. Chainsaw . Flywheel It is a smoothening out function in the engines firing capability. Fix #4: Unclog the Air Filter. For easy comparison, view our Chainsaw Comparison Chart. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. Afterward, you can use a readily available flathead screwdriver to adjust the screws as you want. 2023 LawnMowerForum.com. The throttle decides how much fuel will flow to the engine and how fast the chainsaw will run. For chainsaw carburetors, balance is critical. Most chainsaws either have too high or low RPMs at an idle state. I will check all this stuff when I get it back into the shop tomorrow. As mentioned above, the carburetor comprises three screws (H, I, L) for managing the entire RPMs at high, idle, and low speeds. The partially burned mixture is expelled into the muffler and exits the saw as smoke. 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. Clean the internal parts of your carburetor now with A carb kit can be purchased to help clean and rebuild a plugged carburetor. JavaScript is disabled. This form of idle helps to cool down an engine before shut down. 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. Know that the filter is partially clogged. Like the air filter, the fuel filter is designed to protect the engine from dirt and debris. You are using an out of date browser. 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. Gasoline with lower octane has higher levels of ethanol that disallows it to remain fresh for long. Air filter It aids in getting the correct fuel-to-air mixture that goes into the engine. The chainsaw will die. If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. Both are easy to remove and service. Why does my chainsaw start and dies? 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. the fuel cap contains a one way duck bill valve. Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. While using it yesterday it reved up and stalled. A few minutes of idle time helps regulate the engine temperatures so that your chainsaw gets ready to operate at WOT (wide open throttle). I'm impressed." Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. Why Does My Chainsaw Lose Power When Cutting? We like to help other people maintaining their garden and find cool products to write about. If the chainsaw's being stubborn and is hard to start, that's an indicator that the fuel and air mix are off. Now you noticed that your Chainsaw idles but dies throttle. These properties minimize the burden for man and the environment. This is typically the case when the H adjustment screw is fully loosened. If i can i will try to maybe post videos or pics. If you dont have a tachometer, try to set the speed so the saw idles as high as possible without engaging the clutch. Register today and take advantage of membership benefits. Some carburetors need a specialized tool to adjust their throttle control screws. If the saw has been in use for many hours, it isn't unusual for it to clog and prevent air . Was the gasket there when you tore down the carb? Always check the condition of your filters. How do you Adjust a Carburetor Without a Tool. The idle mode is important as it disengages the engine from running the saw chain. Other causes for a lean running condition include lack of oil in the fuel mix, and when the fuel tank runs empty. On the chainsaw, it is denoted by the letter L. When this screw is tightened, it prevents fuel from flowing to the carburetor. The muffler gets clogged. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. +1-213-221-0119, By using this website I agree with the Disclaimer. My name is Jim Boslice, and I am the founder of The Jimbo Slice Workshop. The built-up gas gets stuck inside and harms the chainsaw further. You must log in or register to reply here. The Carbon disposition in the muffler also causes this issue. 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. (Note that a saw adjusted too lean on the high can also die when accelerated.) He could not get it to start. Before today it would run, idle, and start perfectly even after hrs of hard use. Clean the internal parts of your carburetor now with carb cleaner, using a soft brush to get inside all the holes. The carburetor controls the ratio of fuel to air coursing through the engine. Idling it for longer durations wears the clutch bearing and causes carbon buildup at the exhaust. 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. Idling your chainsaw for a minute or so is quite ideal. Your chainsaw is said to be idling when the engine is on and the throttle isn't pressed. A pressure vac test will check the case for leaks, the "compression" test will test the compression achieved by the piston and cylinder. 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 . This dirt and debris can build up and create a clog. Like the air filter, it is an inexpensive part to replace, but greatly affects performance. Or the chainsaw must have run out of gas. Replacing crank seals is not an easy fix, to say the least, and after only a few years of engine operation, that is not a typical failure. In post #10, the picture of the carb you can see the remains of the black gasket on the top cover. 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. Idle Speed/Throttle Stop This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. To clean your filter, if it's not obvious where the air filter is, check your owner's manual. Then a needle allows fuel to flow into the metering spot. 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. Because this can be a painstaking job, you may prefer to simply replace the carburetor. Lean adjustment It manages the devices fuel and air mixture. This could cause your saw to overheat and is likely to damage your piston rings or seals. It can also be damaged on the inside. Saw does not even appear to want to idle at low. Haha yeah between the tolls and the gas thats like 50 bucks extra right there. This guide will explore some of the reasons why . Thread . 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. Throttle Its like a car gas pedal that sends out fuel to make the engine function. A new chainsaw will be properly tuned, but over time the idle will need adjusting. 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. No more running the saw or taking a hone to it until i know what the problem is and fix it. The diaphragm and its valve get rough and fussy over time. When there's too little fuel, the engine will run "lean" and won't have enough power, so using it as intended can cause engine damage. What youll hear this time is a saw being adjusted for full rev. May have to go back and forth between idle & L mixture screw. Stihl. But when it is further ignited, the chainsaw dies. 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. Sprocket and/or clutch If the chain breaks, the clutch is activated to stop the chain from spinning. The valve is designed beautifully to allow one in and the other out. All rights reserved. Hence, idling a chainsaw for too long does more harm than good. Ok, so $35 on ebay for a new 60mm piston kit and cross my fingers that i can salvage the cylinder. To replace the fuel lines, simply disconnect them from the fuel filter and the carburetor, and replace them with new ones. How to repair a chainsaw that dies when you give it gas 1. It should be about midway between the rich and lean settings. Click on the link below and a WAV sound clip will be loaded into your browser. Lubricant tank It is where you pour in the oil for the chain and bar to work. Changing the idle on a chainsaw carburetor isn't complicated, but getting the right mix can take practice. These saws have what is called a fixed jet which is set from the factory. The main reasons could be clogged or partially clogged fuel filters. Our mechanic is on vacation for the week but when hes back im sure he could probably help too. An extremely lean adjustment will cause the engine to die, too.3. Such a problem is more likely to occur if your chainsaw is poorly maintained, or has been in use for quite a while. It will result in gumming up or congestion. We were unable to add your email to our mailing list. If your carb has three screws to tweak, you'll see labels. Its job is to pump fuel, so when the diaphragm is stiff, the fuel cannot rush through. They dont understand that saws cant be set at the factory and stay correctly adjusted for the life of the saw. All these factors can affect your chainsaw and it dies after you oil it. Too lean adjustment can make your chainsaw stall. With all three of these screws, you'll follow the same process as for the single-screw timing adjustment. Haha, no but then again I've only been down here for a year I'm originally from upstate. Things might be a little more complicated if the problem is related to fuel delivery or to the composition of the fuel itself. I used it yesterday for 30 minutes perfectly. As the saying goes, if it isn't broken, don't fix it. You should clean your air filter regularly to avoid this issue. If the acceleration is not as before go back to step 6. Set the final idle speed. This type of carbon buildup should be visible, and the offending part should be replaced. However, if the cap is loose and air flows in, it will cause the fuel to spill out. Throttle response may also be sluggish and the engine would smoke and perform poorly. If you adjust your saw with a dirty air filter, the saw will run too lean when the filter is cleaned. (2) Check the muffler and exhaust port for carbon build up. Or if you notice it is too damaged internally, you should better let a professional deal with it. Problem fixed temporarily. 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. 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. This vein cannot have a leak and even the smallest dirt can block the vein. As we back it off from lean to rich again, the sound becomes slightly rougher. However, carburetors can become overfilled which causes them to break down. 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. To find out your starting point, fire up your chainsaw and get a flat-head screwdriver ready. Start the chain saw as you normally do and let it . Very convenient. 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. Correct Way to Adjust or Tune the Carburetor on a Chainsaw? Reason 1: Clogged Fuel Filters. Air leak! On and of switch plus choke Its all managed by one lever. The fuel runs from the fuel tank to the carburetor through these veins. While the air filter protects it from airborne particles, the fuel filter protects it from particles found in the fuel. Throttle Interlock It keeps misuse and accidents for occurring. Our repair guide can help you identify the right part to stop your chainsaw's engine from dying at full throttle. Its best to have a digital tachometer on hand to indicate the engine RPMs when adjusting your high-speed screw. Cleaned it up, cleaned the carb and started experimenting with the High Low and Idle screws. 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. 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. If this adjustment is set too low, the engine will die when the throttle trigger is released. The optimum setting is between these two extremes. 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. Mix in a premium 2-cycle oil that is ISO-L-EGD and JASO M345 FD certified. Your chainsaw wont run properly if the engine doesnt receive proper air. If the engine doesn't stall until you depress the throttle, tighten either the low-or high-speed adjustment screw to improve performance. Be sure to use the correct gasoline:oil mixture ratio recommended for your chainsaw.Most Chain Saw Engines Have Three Carburetor Adjusting Screws:1. 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 that doesn't get the saw running smoothly, it's probably time to bring it in for servicing. Low and high adjustment Its function is to control the saws idling speed. 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. Try to set the speed at about 2700 RPM. All rights reserved. It has always been easy to start and runs great. Fortunately, air filters are easy to locate on top of the carburetor clean and replace if necessary. The sprocket enables the chainsaw to spin. An over-revving chainsaw is highly hazardous to your engine, as it can not only score the piston but also overheat its components, resulting in a total seizure. To prevent this malfunction, you can just loosen the tank cap a bit to allow slight air in. 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. Do not attempt to set at maximum RPM levels without a tachometer. In the article, I will explain this in more detail to help you tune and optimize your carburetor setting. All of a sudden your chainsaw starts malfunctioning. 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. This controls the general engine idle-speed, and tweaking its performance is much like the single-screw carburetor adjustment above. A lean condition also allows for excessive RPM which often leads to big end rod bearing failure. Your chainsaw will stall if it doesnt receive the proper amount of air and gas. STIHL chainsaws are German-engineered and built in America.*. 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). Clockwise is generally the direction you turn to make the mixture leaner, and counterclockwise usually makes it richer. Tips from a Professional. NOTE: If you do not have a tachometer, set the RPM level so that the saw four cycles or blubbers at wide open throttle. If dirty and clogged, remove the air filter from its bay, soak it in warm water with soap and . Clogged filters will restrict gas flow. Adjust this screw second. Better safe than sorry! Now, these screws can be adjusted simply by using a flathead screwdriver. You'll probably also find excess deposits on the spark arrestor. 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). As a result, the air-fuel mixture becomes lean, and this can cause the engine RPMs to spike. If your chainsaw engine dies at full throttle, check the following parts: the carburetor, fuel lines, fuel filter, air filter, and muffler. JavaScript is disabled. So when should you adjust the idle? If your chain starts to rotate, loosen the idler screw until it stops. It's safe to say that you should never have to completely open or close a timing screw to its maximum or minimum. Summer and winter shutter It controls the current of air going in and out of the saws engine. 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. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. Select gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%. Never set the idle so the chain runs when the throttle is released. The idler screw in the carburetor controls the idle RPMs of your chainsaw. Nous partageons galement des informations sur votre usage de notre site avec nos rseaux sociaux, publicitaires et partenaires d'analyse, You are trying to build your own DIY project but bamm! When turning the screw clockwise or counterclockwise, watch for when the engine's behavior changes both while you're throttling it but also when idling. 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. Finally, if the chainsaw stalls out and dies when it's working under a load, that's usually an idle problem as well. 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. The high-speed setting controls the maximum engine RPMs. 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. Manifold damage can happen when its used for a long time. You are trying to build your own DIY project but bamm! They all come with their own benefits and downfalls, as well as various product offerings. It can cause the chainsaw to get insufficient air and too much fuel. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. Its because it gets air locked inside the tank. Why Does My Stihl Chain Saw Bog Down When I'm Cutting. The filter is usually protected by a raised, round cover that you can take off after removing some screws. Clean your chainsaws bar oil holes to avoid this. Slowly we lean the low speed adjuster by turning it in, till the idle climbs and it then starts to die. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. Before you call it a day on adjusting your carburetor idle, test its performance while throttling and idling. Most types follow a ratio of 40:1 or 50:1. Then ensure one very simple thing. No luck, the longest i got it running was about 20 seconds and it wildly revs up and . High idle! Apart from idling at startup, it is also good to let your chainsaw idle after an extended operation. 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. By creating an account you agree to the Hunker. Keep them clean to ensure there is no blockage that restricts proper fuel and air inflow. 5,329 views Dec 5, 2020 Air leaks are a common problem with chainsaws. Also, you should check your air filters and fuel filters. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. Keep turning the screw until the engine starts to load up. Restoring the needle and seat contact areas in your carburetor This is critical because a chain rotating at idle is extremely dangerous. These seats are delicate and if they are damaged, the carburetor has to be replaced. (4) Check the fuel level. In that case, there is a rather simpler technique for making the screw adjustment. First, locate the "LA" screw. But before all that I will figure out how to do a pressure and vac test to diagnose and correct possible air leak problem? An over rich condition causes carbon buildup and will plug the fire screen and cylinder ports if run for a period of time. Please remember that a lean fuel mixture raises the maximum engine temperature by increasing the engine RPMs. The air filter is under a cover on the engine housing, and the spark arrestor is between the exhaust port and the muffler. 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. 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. May have to go back and forth between idle & L mixture screw. Take the muffler off and look in through there or get a flash light and look in through the plug hole and see if you can figure out what's up. 03:06. The fact is, some manufacturers think that way, too, and have tried fixed jet and semi-fixed jet carburetors. Or maybe gas varnish in the screen filter at the base of the metering needle. The "H" screw is for high-speed adjustment. It is not the gas. Save my name, email, and website in this browser for the next time I comment. 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. Carburetors mix fuel and air to run the engine. If the plug is excessively coated with carbon deposits, it's a sign that the fuel mixture in the combustion chamber is too rich. 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. The air filter in your chainsaw protects your chainsaw from dirt and debris by filtering it out before it can reach the engine. All of a sudden your. You may be able to purchase a carb kit, and clean and rebuild the carb, rather than replacing it. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. When fully tightened, it inhibits fuel from entering the carb, resulting in a lean running engine.