Take care when removing the fuel lines with a twisting and pulling motion, and take off the carburetor linkage. To adjust the carburetor idle speed, locate the idle speed screw labeled with a "T" just above the primer bulb. 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. Before tuning the carburetor, make sure the air filter is clean and the spark arrestor is unclogged from carbon deposits. Each is considered a top old chainsaw brand in its own right. Then we go rich and hear the saw start to blubber and the RPMs drop, almost to a point where it dies. But you have to find out whats wrong with your chainsaw. Most chainsaws either have too high or low RPMs at an idle state. A lean condition also allows for excessive RPM which often leads to big end rod bearing failure. A few minutes of idle time helps regulate the engine temperatures so that your chainsaw gets ready to operate at WOT (wide open throttle). The valve is designed beautifully to allow one in and the other out. 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. Adjust this screw second. Sounds like a blocked passage somewhere to me. A carburetor has three adjustment screws that are in chargeof controllingthe engines RPMs. Thus, the diaphragm wont be pulled inwards anymore. In the article, I will explain this in more detail to help you tune and optimize your carburetor setting. Reason 1: Clogged Fuel Filters. 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. Your chainsaw wont run properly if the engine doesnt receive proper air. Mix in a premium 2-cycle oil that is ISO-L-EGD and JASO M345 FD certified. I will check all this stuff when I get it back into the shop tomorrow. We were unable to add your email to our mailing list. Why does my chainsaw start and dies? 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. Ok, so $35 on ebay for a new 60mm piston kit and cross my fingers that i can salvage the cylinder. This type of carbon buildup should be visible, and the offending part should be replaced. 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. Do not attempt to set at maximum RPM levels without a tachometer. Pull cord Its the chainsaws startup mechanism. If the plug is excessively coated with carbon deposits, it's a sign that the fuel mixture in the combustion chamber is too rich. This controls the air/fuel mixture when it's idling, or resting at lower speeds. You should clean your air filter regularly to avoid this issue. With low pressure can of compressed air, carefully blew out the small openings. 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. Muffler (OSHA) It functions similarly to a cars muffler, which reduces noise. Throttle Interlock It keeps misuse and accidents for occurring. The idle mode is important as it disengages the engine from running the saw chain. You'll probably also find excess deposits on the spark arrestor. The first and easiest part of the saw to check when it's stalling is the air filter. 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. 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. Know that there can be more reasons why your. If the saw will not idle, go to the next step. (6) Set the low speed fuel adjustment. This blog is written by a group of Garden Tool enthusiasts. (7) Go back to step (5) and reset the idle speed. Following are some possible causes of this issue: Pro Chainsaw Sharpener. If your carb has three screws to tweak, you'll see labels. 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. Then, the filter is usually easy to lift off its seat. Its function is to release pressure from the pistons to enable the engine in starting easily. 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. 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. The "L" screw is for low-speed adjustment. Know your dos and donts and know your chainsaw well. Compression test is different from a pressure vac test. If i can i will try to maybe post videos or pics. 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. JavaScript is disabled. However, when some chainsaw engines are starved of fuel and run leaner than usual, they can only be kept runningby keeping the choke on. 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. 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. In addition to low power, a lean condition causes the cylinder temperature to rise, which often leads to seizure. Keep them clean to ensure there is no blockage that restricts proper fuel and air inflow. Adjust "LA" idle screw: Next, while the chainsaw is idle, make sure the chain is not moving. Coleura - Garden Tool Expert With Helpful Tips, Chainsaw Pressure Test Kit. No more running the saw or taking a hone to it until i know what the problem is and fix it. I have been working with power tools for over 10 years. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. 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. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. Receive money-saving advice and special discounts! 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. Move the throttle plate on the carb to the idle position manually. That makes the chainsaw bog down. 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. This could cause your saw to overheat and is likely to damage your piston rings or seals. 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. On the chainsaw, it is denoted by the letter H. This setting controls how much fuel enters the carburetor when the throttle is held. 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-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. After you strike the perfect idle, your chainsaw will cut efficiently and smoothly. If the engine doesn't stall until you depress the throttle, tighten either the low-or high-speed adjustment screw to improve performance. This dirt and debris can build up and create a clog. 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. Our repair guide can help you identify the right part to stop your chainsaws engine from dying at full throttle. 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. Those of you with slow systems or connections may not want to wait! With this step accomplished, you have effectively set your chainsaw to function at an optimum speed with no lag. first question is are you in tree cutting business? The partially burned mixture is expelled into the muffler and exits the saw as smoke. A chainsaw should only idle for a few minutes to warm up the engine and the cutting chain. Your chainsaw wont run properly if the engine doesnt receive proper air. Your chainsaw will stall if it doesnt receive the proper amount of air and gas. It's safe to say that you should never have to completely open or close a timing screw to its maximum or minimum. Open the carburetor, clean with an airline, or remove the dirt first. Or, these veins can be detached and replaced as well. Start with the air filter housing filter and air filter, and take off the bolts holding down the carb and gasket. Clogged filters will restrict gas flow. To clean your filter, if it's not obvious where the air filter is, check your owner's manual. This will cause the needle to stay in its place and no fuel will flow to the engine. Cleaning and potentially replacing your fuel filter should be part of routine maintenance for your chainsaw. In this case, the filter is likely only partially clogged, so it will allow enough air to the engine for it to run on idle, but not enough to sustain full throttle. Chain Its the most important piece of the device, which does the cutting. Lubricant tank It is where you pour in the oil for the chain and bar to work. . This is typically the case when the H adjustment screw is fully loosened. Lean adjustment It manages the devices fuel and air mixture. Hunker may earn compensation through affiliate links in this story. Add a fuel stabilizer. This controls the general engine idle-speed, and tweaking its performance is much like the single-screw carburetor adjustment above. When the carb becomes clogged (which is often the result of old fuel sitting in it over a long period of time, like over the winter), it will not perform this task effectively. You may be able to purchase a carb kit, and clean and rebuild the carb, rather than replacing it. 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. STIHL chainsaws are German-engineered and built in America.*. Other causes for a lean running condition include lack of oil in the fuel mix, and when the fuel tank runs empty. But before all that I will figure out how to do a pressure and vac test to diagnose and correct possible air leak problem? Fixed jet carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Haha, no but then again I've only been down here for a year I'm originally from upstate. Why Does My Stihl Chain Saw Bog Down When I'm Cutting. Tips from a Professional. Did you clean the screen in the carb? Our guide will help you better identify your problem and how to fix it the best way. 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. McCulloch. However, avoid letting it rev for longer durations (such as 5 to 10 minutes or higher). If your chainsaw has been in storage, the fuel may need to be replaced. A mixture that is too lean will starve the engine and cause it to race or surge. To replace the fuel lines, simply disconnect them from the fuel filter and the carburetor, and replace them with new ones. As we back it off from lean to rich again, the sound becomes slightly rougher. 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. When such a clog occurs, the exhaust gasses will not be able to exit the engine, and it will cause your chainsaw to die. Slowly we lean the low speed adjuster by turning it in, till the idle climbs and it then starts to die. It can also be damaged on the inside. They dont understand that saws cant be set at the factory and stay correctly adjusted for the life of the saw. 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. While the air filter protects it from airborne particles, the fuel filter protects it from particles found in the fuel. Fix #4: Unclog the Air Filter. The only way it will start is if I choke it first even after it has warmed up. Now slowly turn in the screw to a position where it idles the best. Manual fuel pump Its a mechanism that makes the saw engine easily start. If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. A carburetor kit will helps with this. Your carburetor is tasked with mixing fuel and air in the correct ratio, so that combustion can occur, and your chainsaw will run. 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. The Carbon disposition in the muffler also causes this issue. For chainsaw carburetors, balance is critical. Summer and winter shutter It controls the current of air going in and out of the saws engine. If this seems like the right setting, it's probably wise to take the chainsaw into the shop for some maintenance. Copyright 2023 eReplacementParts.com Inc. Engine Will Idle But Dies At Full Throttle. Adjusting the carburetor with the air filter partially clogged is like adjusting the carburetor with the choke partially on. Carbon clogging the exhaust port or spark arrestor screen can cause a saw to run as if the carburetor requires adjustment. With the carb apart, make sure all the passages are clear. All of a sudden your chainsaw starts malfunctioning. the fuel cap contains a one way duck bill valve. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. STIHL chainsaws have many more features, including anti-vibration technology for enhanced comfort. Take note of where the screw is when it runs lean or rich. You can download Zama's technical manual from zama's website. 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. Adjusting the idle on a chainsaw all comes down to the turn of a T-head screw. 03:06. Our mechanic is on vacation for the week but when hes back im sure he could probably help too. The solution is very simple. Also, you should check your air filters and fuel filters. If dirty and clogged, remove the air filter from its bay, soak it in warm water with soap and . As a landscape builder, he helped establish two gardening companies. Black & Decker 20V MAX Cordless Electric Chainsaw (Model LCS1020) Review, All You Need to Know About Chainsaw Chain Types. And the air filter is designed to protect the engine from polluted air. These properties minimize the burden for man and the environment. Or if you notice it is too damaged internally, you should better let a professional deal with it. Now slowly turn the adjustment screw out and the engine should run better. Running at full throttle right away causes the pistons to expand thermally. First, locate the "LA" screw. It has always been easy to start and runs great.
