We are compensated for referring traffic and business to Amazon and other companies linked to on this site. If the plug is excessively coated with carbon deposits, it's a sign that the fuel mixture in the combustion chamber is too rich. My name is Jim Boslice, and I am the founder of The Jimbo Slice Workshop. Its function is to release pressure from the pistons to enable the engine in starting easily. When dismantling your carburetor for rebuilding, its a good idea to take photos as you go, to make reassembly easier. With time, your filter gets clogged with harmful particles. You can download Zama's technical manual from zama's website. Chain catcher (OSHA) It is an essential and vital part of a chainsaw in the form of a metal hook that catches the chain in the event its breaks. This form of idle helps to cool down an engine before shut down. A chainsaw chain should never spin when idle. Was the gasket there when you tore down the carb? I have experience using power tools for a variety of tasks such as construction, household, gardening, cleaning, etc. In the article, I will explain this in more detail to help you tune and optimize your carburetor setting. For chainsaw carburetors, balance is critical. Before you call it a day on adjusting your carburetor idle, test its performance while throttling and idling. Very convenient. You might see that your chainsaw functions on idle but hesitates or dies when throttled. A carburetor has three adjustment screws that are in chargeof controllingthe engines RPMs. I recommend idling it for some minutes to help regulate the engine temperatures and, after that, crank up the RPMs by pressing the throttle. Three-screw carbs are trickier to tune, so be careful when adjusting the high-speed performance screw. However, when some chainsaw engines are starved of fuel and run leaner than usual, they can only be kept runningby keeping the choke on. A carburetor kit will helps with this. Compression test is different from a pressure vac test. Its a huge mood killer, right? Most types follow a ratio of 40:1 or 50:1. When I first worked on the carb, I noticed The Airhead Throttle was moving back and forth without any resistance. If it's accelerating too slowly, or sputters and jumps erratically when idling, it's got too little fuel and needs more. This vein cannot have a leak and even the smallest dirt can block the vein. Clogged filters will restrict gas flow. 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. Haha im getting nervous here. Your chainsaw is said to be idling when the engine is on and the throttle isnt pressed. When fully tightened, it inhibits fuel from entering the carb, resulting in a lean running engine. If your chain starts to rotate, loosen the idler screw until it stops. Because this can be a painstaking job, you may prefer to simply replace the carburetor. 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. For a smooth and functional chainsaw, clean or replace your clogged air filters. For a better experience, please enable JavaScript in your browser before proceeding. I've never worked on a Zama C1M carb. Stihl MS361 - need help - starts, runs dies, tried most everything, Firewood, Heating and Wood Burning Equipment. How do you Adjust a Carburetor Without a Tool. Thread starter chad556; Start date Feb 26, 2011; 1; 2; 3 . With time, your filter gets clogged with harmful particles. Pull cord Its the chainsaws startup mechanism. Manifold damage can happen when its used for a long time. When the RPMs are too high, it can be pretty dangerous as the chain can get engaged. Slowly we lean the low speed adjuster by turning it in, till the idle climbs and it then starts to die. Your chainsaw will stall if it doesnt receive the proper amount of air and gas. These saws have what is called a fixed jet which is set from the factory. Wrong assumption. Shutting them off without idling removes the air-cooling ability and may thermally overload the system, and this may cause damage to certain components in the chainsaw over time. A new chainsaw will be properly tuned, but over time the idle will need adjusting. Try to set the speed at about 2700 RPM. 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. Decompression valve It can only be found on some saw models. Also, please be careful when you deal with dangerous equipment. After you strike the perfect idle, your chainsaw will cut efficiently and smoothly. Note: this is a general repair guide. You might see that your chainsaw functions on idle but hesitates or dies when throttled. But before all that I will figure out how to do a pressure and vac test to diagnose and correct possible air leak problem? The chain should only spin when the throttle is pressed. On right-handed chainsaws, the idle screw tends to be on the left. A pressure vac test will check the case for leaks, the "compression" test will test the compression achieved by the piston and cylinder. The piston usually expands more than the cylinder walls, and as a result, the oil film between them thins down. I have been working with power tools for over 10 years. You must log in or register to reply here. The last thing anyone wants is a saw that purrs when idling and bogs down when applying gas. Idle Speed/Throttle Stop This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. But when it is further ignited, the chainsaw dies. You are trying to build your own DIY project but bamm! Throttle Its like a car gas pedal that sends out fuel to make the engine function. For a smooth and functional chainsaw, clean or replace your clogged air filters. No visible signs of dirt, bad gas, etc. 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. 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. Some manufacturers recommend never adjusting this screw more than turn either way. The fuel runs from the fuel tank to the carburetor through these veins. 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. 2023 LawnMowerForum.com. With all three of these screws, you'll follow the same process as for the single-screw timing adjustment. The following nine brands are listed in no particular order. JavaScript is disabled. If the chainsaw continues stalling, the issue might be with the low-speed and idle screws, which you will need to adjust. Los Angeles, CA 90013 Adjust "LA" idle screw: Next, while the chainsaw is idle, make sure the chain is not moving. It's safe to say that you should never have to completely open or close a timing screw to its maximum or minimum. First, it could be that the carburetor, spark arrestor or the air filter are dirty. Now slowly turn the adjustment screw out and the engine should run better. A clogged air filter will complicate any attempt to adjust your idle. And the air filter is designed to protect the engine from polluted air. Tips from a professional. The Carbon disposition in the muffler also causes this issue. Thanks for the advice guys. As we back it off from lean to rich again, the sound becomes slightly rougher. Adjusting the idle on a chainsaw all comes down to the turn of a T-head screw. Fuel tank It is the location of the devices fuel and oil mixture. Carbon clogging the exhaust port or spark arrestor screen can cause a saw to run as if the carburetor requires adjustment. Always stop a saw before the tank runs completely dry. In that case, there is a rather simpler technique for making the screw adjustment. Then continue to turn it counter-clockwise 1/4 turn further. The valve is designed beautifully to allow one in and the other out. Choose whats easier for you. This is screw is critical to be careful with, because setting it too lean or rich can cause serious engine damage. JavaScript is disabled. The muffler gets clogged. This can cause the engines RPMs to drop and die at low speed. If not you could be sucking air just like a bad impulse hose would. Sounds like a blocked passage somewhere to me. If that doesn't get the saw running smoothly, it's probably time to bring it in for servicing. 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. 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. If you dont have a tachometer, try to set the speed so the saw idles as high as possible without engaging the clutch. I will check all this stuff when I get it back into the shop tomorrow. 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. 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]. PoulanPro. Well, still not sure whats happening. After some gentle scrubbing and a rinse with clean water, let it dry, and the filter should be as good as new. Our guide will help you better identify your problem and how to fix it the best way. If the chainsaw's being stubborn and is hard to start, that's an indicator that the fuel and air mix are off. The proportion of fuel flowing out and air flowing in is equivalent. Things might be a little more complicated if the problem is related to fuel delivery or to the composition of the fuel itself. Top Reasons Chainsaw Starts, Then Stalls Chainsaw Troubleshooting - YouTube 0:00 / 2:01 Top Reasons Chainsaw Starts, Then Stalls Chainsaw Troubleshooting RepairClinic.com 489K. The throttle decides how much fuel will flow to the engine and how fast the chainsaw will run. This is a dangerous condition and should never be allowed.2. If dirty and clogged, remove the air filter from its bay, soak it in warm water with soap and . With the carb apart, make sure all the passages are clear. Turn it so you know where the lean and rich points are, and then find the medium between them. However, the basic reason is mostly because of insufficient fuel supply to the engine. Always run your saw idle for a few minutes and keep the tank half-filled to obtain optimum tuning results. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power. Have you tried backing out the idle screw? 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. 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. On the chainsaw, it is denoted by the letter H. This setting controls how much fuel enters the carburetor when the throttle is held. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment. The air filter is under a cover on the engine housing, and the spark arrestor is between the exhaust port and the muffler. The tank should be over half full. 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. Always check the condition of your filters. It may not display this or other websites correctly. 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. As a landscape builder, he helped establish two gardening companies. Finally, if the chainsaw stalls out and dies when it's working under a load, that's usually an idle problem as well. While using it yesterday it reved up and stalled. As the saying goes, if it isn't broken, don't fix it. In addition to low power, a lean condition causes the cylinder temperature to rise, which often leads to seizure. 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. Take note of where the screw is when it runs lean or rich. Make a mental note of the position of the screwdriver slot. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem. 5,329 views Dec 5, 2020 Air leaks are a common problem with chainsaws. Bar Its the central piece that the chain circles around. I'll keep you posted what I find out. Engine Gas-powered chainsaws are still regarded as the standard. Most chainsaw users may not have this tool at hand. Our repair guide can help you identify the right part to stop your chainsaw's engine from dying at full throttle. Have you peeked in the spark plug hole at the cylinder walls? Ok, so $35 on ebay for a new 60mm piston kit and cross my fingers that i can salvage the cylinder. Chain Its the most important piece of the device, which does the cutting. MS271 runs/idles great but dies at the trigger. Idling of small engines essentially results in incomplete combustion of the fuel. A carb kit can be purchased to help clean and rebuild a plugged carburetor. He could not get it to start. 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. 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. 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. Most time problems like this are signs that the carburetor diaprams are getting stiff and the carb needs to be rebuilt. Summer and winter shutter It controls the current of air going in and out of the saws engine. 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. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'thejimbosliceworkshop_com-leader-1','ezslot_11',104,'0','0'])};__ez_fad_position('div-gpt-ad-thejimbosliceworkshop_com-leader-1-0');The Diaphragm is designed to bring in the needful fuel into the inlet of the carburetor. STIHL chainsaws are German-engineered and built in America.*. Chainsaw running out of control! (7) Go back to step (5) and reset the idle speed. However, avoid letting it rev for longer durations (such as 5 to 10 minutes or higher). When you press the throttle, the engine kicks off and the chainsaw starts looping. If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. Fix your Lawnmower with our Lawnmower Troubleshooting tool. This dirt and debris can build up and create a clog. Adjusting the carburetor with the air filter partially clogged is like adjusting the carburetor with the choke partially on. These types of carburetors have never worked well. With frequent use, the chainsaw deposits carbon in the muffler. Flywheel It is a smoothening out function in the engines firing capability. You will have to bring a kit to fix the car. Fixed jet carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Its a tear on the manifolds body. A lean condition also allows for excessive RPM which often leads to big end rod bearing failure. 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. Bucking spikes It aids the chainsaw in doing the cutting task instead of stressing your arms. To do this, detach your carburetor from the chainsaw and fix it on a bench vise. Its best to have a digital tachometer on hand to indicate the engine RPMs when adjusting your high-speed screw. Afterward, you can use a readily available flathead screwdriver to adjust the screws as you want. 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 guide will explore some of the reasons why . 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. Hunker may earn compensation through affiliate links in this story. Problem fixed temporarily. So if your chainsaw bogs, know that it isnt receiving enough fuel. This is critical because a chain rotating at idle is extremely dangerous. Check the fuel filter and tank for crud. Throttle Interlock It keeps misuse and accidents for occurring. It also identifies the three adjustment screws and their function. This will cause the needle to stay in its place and no fuel will flow to the engine. Make sure there's not too much smoke, that the engine purrs smoothly. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. It is not the gas. Our repair guide can help you identify the right part to stop your chainsaws engine from dying at full throttle. 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. Too lean adjustment can make your chainsaw stall. If your saw dies at idle, turn the idle screw clockwise until the chain just starts to move. -Clever Jeff . The choke is normally switched off after the engine runs. The whole metering diaphragm ensures that when the fuel is being used, the diaphragm gets pulled down. Idling your chainsaw for a minute or so is quite ideal. 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. In that case, go to a chainsaw shop or hardware store to have a pro check things out. When a clog occurs, your engine will not get enough air to operate effectively. Dirty or clogged air filters can stop the inflow of air. With low pressure can of compressed air, carefully blew out the small openings. It can also happen if the carburetor is overfilled. Required fields are marked *. Most chainsaws either have too high or low RPMs at an idle state. Apart from idling at startup, it is also good to let your chainsaw idle after an extended operation. Changing adjustments on one jet will often affect the other slightly. Unscrew the screws at the bottom of the carb and remove it, pulling the bottom off and removing he gasket and diaphragm. With frequent use, the chainsaw deposits carbon in the muffler. An adjustment that is too lean will also produce insufficient power and is more likely to damage the engine through lean seizure. 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 cylinder does need to be honed a little though (or replaced) how will i know? 372xt won't stay running, dies in the cut, hard to start. Your chainsaw wont run properly if the engine doesnt receive proper air. Why Does My Stihl Chain Saw Bog Down When I'm Cutting. Electric vs. Gas Chainsaw: Which One Is Better? 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. Check the Filters. 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). They dont understand that saws cant be set at the factory and stay correctly adjusted for the life of the saw. Add a fuel stabilizer. Then ensure one very simple thing. Know that there can be more reasons why your. If this adjustment is set too low, the engine will die when the throttle trigger is released. The solution is very simple. Will not Idle! Changing the idle on a chainsaw carburetor isn't complicated, but getting the right mix can take practice. By creating an account you agree to the Hunker. 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. 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. The idler screw in the carburetor controls the idle RPMs of your chainsaw. It may not display this or other websites correctly. No luck, the longest i got it running was about 20 seconds and it wildly revs up and . Better safe than sorry! The problem could be a lack of air or a misfiring spark plug, and both of these problems are easy to check and remedy. Make sure you change your filters as soon as you face the problem. Generally speaking, the more power your chainsaw requires, the more fuel it will burn. Disconnect the fuel filter from the fuel lines, and at this point you can either clean or replace the filter to solve this problem.
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