Correct Way to Adjust or Tune the Carburetor on a Chainsaw? If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. That makes the chainsaw bog down. For a better experience, please enable JavaScript in your browser before proceeding. This screw governs the amount of fuel that reaches the carburetor at low speed. 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. On the chainsaw, it is denoted by the letter L. When this screw is tightened, it prevents fuel from flowing to the carburetor. 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. 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. Keep turning the screw until the engine starts to load up. These saws have what is called a fixed jet which is set from the factory. Stihl MS361 - need help - starts, runs dies, tried most everything, Firewood, Heating and Wood Burning Equipment. If your bar and chain are not lubricated well with oil, they can die down. Like said before check cylinder condition. Cleaning and potentially replacing your fuel filter should be part of routine maintenance for your chainsaw. Carbon clogging the exhaust port or spark arrestor screen can cause a saw to run as if the carburetor requires adjustment. The jersey shore guy? Now you noticed that your Chainsaw idles but dies throttle. Have you peeked in the spark plug hole at the cylinder walls? Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Thanks for the advice guys. Its a huge mood killer, right? Use the hacksaw to cut a flat rectangular slot on the top of the screws. If it is not available, consult your devices manualto determine the best setting for the H screw. I have seen/taken apart a couple pistons and clyinders but i havent really seen much of what scoring looks like first hand. Ok, so $35 on ebay for a new 60mm piston kit and cross my fingers that i can salvage the cylinder. 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. All you got to do is get yourself a screwdriver. You are most likely to not be able to notice a break in the veins. Well, still not sure whats happening. Most types follow a ratio of 40:1 or 50:1. Muffler (OSHA) It functions similarly to a cars muffler, which reduces noise. Fuel can begin to degrade as quickly as 30 days after purchase. It will also lack power in the cut and tend to run very hot.The preceding information briefly explains rich and lean running conditions. #1, check to see if the throttle is closing completely. Its job is to pump fuel, so when the diaphragm is stiff, the fuel cannot rush through. However, at times they malfunction and the fuel cant reach the carburetor. Take note of where the screw is when it runs lean or rich. The "L" screw is for low-speed adjustment. As the saying goes, if it isn't broken, don't fix it. Your chainsaw will stall if it doesnt receive the proper amount of air and gas. It means only enough fuel and air can reach the engine to keep the chainsaw idle. If your carb has three screws to tweak, you'll see labels. Never set the idle so the chain runs when the throttle is released. No visible signs of dirt, bad gas, etc. If you think youve found just the right spot squeeze the throttle and the saw should rev up without any hesitation or stumbling. Add a fuel stabilizer. It has a throttle shaft and plate. Was the gasket there when you tore down the carb? The proportion of fuel flowing out and air flowing in is equivalent. nous utilisons les cookies afin de personnaliser le contenu et les publicits, de fournir des fonctionnalits pour les rseaux sociaux et analyser notre traffic. You may be able to purchase a carb kit, and clean and rebuild the carb, rather than replacing it. It can cause the chainsaw to get insufficient air and too much fuel. 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. Hunker may earn compensation through affiliate links in this story. As mentioned above, the carburetor comprises three screws (H, I, L) for managing the entire RPMs at high, idle, and low speeds. Otherwise, it can further aggravate the dangers of using a chainsaw. Put in ultrasonic cleaner. Chainsaw running out of control! We also go a step further and custom manufacture our own guide bars and saw chains for all our machines in-house. If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. This controls the general engine idle-speed, and tweaking its performance is much like the single-screw carburetor adjustment above. Since chainsaws are air-cooled, idle runs after full-throttle provide sufficient time for the high engine temperatures to fall. You should clean your air filter regularly to avoid this issue. 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. This is accomplished by gently screwing the adjusting screws onto their seats and then backing them out one turn each. Know that there can be more reasons why your chainsaw idles but dies throttle. What youll hear is an idling saw. If this adjustment is set too low, the engine will die when the throttle trigger is released. Or, these veins can be detached and replaced as well. first question is are you in tree cutting business? If youre adjusted too lean itll run out of gas and die, or die when accelerated. 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 throttle screw. When such a clog occurs, the exhaust gasses will not be able to exit the engine, and it will cause your chainsaw to die. 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. 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. Also, please be careful when you deal with dangerous equipment. 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. However, when some chainsaw engines are starved of fuel and run leaner than usual, they can only be kept runningby keeping the choke on. In the article, I will explain this in more detail to help you tune and optimize your carburetor setting. Also, you can try using 10w40 chainsaw bar oil.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'thejimbosliceworkshop_com-large-leaderboard-2','ezslot_8',112,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-large-leaderboard-2-0'); This is mostly because of poor carburetor adjustment. Like the air filter, it is an inexpensive part to replace, but greatly affects performance. This can result in one or more of these parts becoming clogged. This can also affect the airflow in the engine, causing it to stall. It cant be allowing both in or both out. - 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. I used it yesterday for 30 minutes perfectly. 2023 LawnMowerForum.com. Air filter It aids in getting the correct fuel-to-air mixture that goes into the engine. Make sure there's not too much smoke, that the engine purrs smoothly. The idler screw in the carburetor controls the idle RPMs of your chainsaw. Too lean adjustment can make your chainsaw stall. 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. Plus, as I mentioned beforehand, an imbalance in the air and fuel ratio disrupts the chainsaws operation and it dies down. Replacing it would always be the better choice. Or maybe gas varnish in the screen filter at the base of the metering needle. To do this, detach your carburetor from the chainsaw and fix it on a bench vise. Now slowly turn in the screw to a position where it idles the best. I'm impressed." Well, the whole story was that he took it to his local stihl dealer and they told him that the piston and clyinder were bad, causing the saw to rev up fast when it was started instead of idle like it should. MS271 runs/idles great but dies at the trigger. An engine running on a rich fuel mixture, on the other hand, reduces its RPMs significantly. If not you could be sucking air just like a bad impulse hose would. Check fuel line for holes or cracks. You can download zama's technical manual from zama's website. Then ensure one very simple thing. Its at this point youll need to look out for corrosion or wear on the internal parts of the carburetor. PoulanPro. 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. It disrupts a proper balance in the ratio of fuel and air. Please remember that a lean fuel mixture raises the maximum engine temperature by increasing the engine RPMs. 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). Adjust this screw second. Now that you can see the actual damage, the results of the P&C compression test arent too relevant. And the air filter is designed to protect the engine from polluted air. When dismantling your carburetor for rebuilding, its a good idea to take photos as you go, to make reassembly easier. The fuel filter is usually in the gas tank and easily removable and replaceable. Then run the chainsaw again to see if its all good. If the cylinder does need to be honed a little though (or replaced) how will i know? Exciting insights to the work of professionals with chainsaws in the mountain forest can be found here: Heli-logging. Thus, it helps the engine to relieve some torque and saves fuel/electricity. Thus, the diaphragm wont be pulled inwards anymore. 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. 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. The sprocket enables the chainsaw to spin. All rights reserved. Your email address will not be published. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. 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. With this step accomplished, you have effectively set your chainsaw to function at an optimum speed with no lag. Chainsaw . But when it is further ignited, the chainsaw dies. The burn does not produce much heat, so the power stroke is weak. Engine Gas-powered chainsaws are still regarded as the standard. If that doesn't get the saw running smoothly, it's probably time to bring it in for servicing. A dirty fuel filter restricts fuel flow, which also kills the engine. You might see that your chainsaw functions on idle but hesitates or dies when throttled. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. You can download Zama's technical manual from zama's website. Again, with time pump diaphragm and tank cap becomes faulty which may lead to this problem. Our mechanic is on vacation for the week but when hes back im sure he could probably help too. May have to go back and forth between idle & L mixture screw. Fix your Lawnmower with our Lawnmower Troubleshooting tool. Make sure you change your filters as soon as you face the problem. The muffler gets clogged. Similarly, turning the screw out causes the mixture to become rich due to a high fuel supply. Some manufacturers recommend never adjusting this screw more than turn either way. 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. However, the basic reason is mostly because of insufficient fuel supply to the engine. Cleaned it up, cleaned the carb and started experimenting with the High Low and Idle screws. Clean your chainsaws bar oil holes to avoid this. 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. Idling it for longer durations wears the clutch bearing and causes carbon buildup at the exhaust. Use low pressure compressed air, and a stiff paint brush bristle to check them all. I will check all this stuff when I get it back into the shop tomorrow. Air leak! May have to go back and forth between idle & L mixture screw. Chances are that the RPM setting has changed since you optimized the fuel mixture adjustment. (8) Set the high speed fuel adjustment. My name is Jim Boslice, and I am the founder of The Jimbo Slice Workshop. For more information, as to how a carburetor can cause this symptom, please see our carburetor section. An adjustment that is too lean will also produce insufficient power and is more likely to damage the engine through lean seizure. Other causes for a lean running condition include lack of oil in the fuel mix, and when the fuel tank runs empty. Did you clean the screen in the carb? Cleaning and potentially replacing your fuel filter should be part of routine maintenance for your chainsaw. This is particularly true when you attempt to run your chainsaw on full throttle. Fortunately, air filters are easy to locate on top of the carburetor clean and replace if necessary. Know that the filter is partially clogged. For chainsaw carburetors, balance is critical. That may require raising the idle up to prevent the engine from dying. Now slowly turn the adjustment screw out and the engine should run better. An extremely lean adjustment will cause the engine to die, too.3. In post #10, the picture of the carb you can see the remains of the black gasket on the top cover. Adjusting the idle on a chainsaw all comes down to the turn of a T-head screw. But you have to find out whats wrong with your chainsaw. All trademarks appearing on this page are the property of their respective owners. depending on the screw type, you may need a Single-d or a Double-d adjusting tool. I use the same clean 2-cycle gas in three other machines with no problems. Just snap a photo and we'll find and store your user manuals, receipts, and product information in one easy-to-find place! Before you call it a day on adjusting your carburetor idle, test its performance while throttling and idling. Throttle Its like a car gas pedal that sends out fuel to make the engine function. Slowly turn in the screw until the engine surges or starves for fuel. The issues might be a defective spark plug or simply lacking air in the system. Three-screw carbs are trickier to tune, so be careful when adjusting the high-speed performance screw. should i try it without touching the cylinder first or could that kill the new piston i put in it? 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. 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). First, locate the "LA" screw. Some carburetors need a specialized tool to adjust their throttle control screws. Coleura - Garden Tool Expert Dont worry read till the end to clear out your doubts and fix them! If dirty and clogged, remove the air filter from its bay, soak it in warm water with soap and . Always check the condition of your filters. Before today it would run, idle, and start perfectly even after hrs of hard use. If too much fuel mixes with air, it runs "rich," and could choke up and bog down, produce excess smoke, or waste gas.
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