First, remove the old fuel line from the fuel tank. I took it to the shop for repair, thinking it was the carb but they told me I ran straight gas through it and seized it up. Why Is My Chainsaw Bogging Down? Turn your chainsaws bar to ensure even wear and tear. First, be sure to read your chainsaws manual to determine whether you need specialized tools to disassemble the carburetor. After the overhaul of the piston assembly I used this saw to cut up three rather large downed trees, and some other work. I didn't run straight gas through it and it isn't sized up so I am wanting to dig into the carb myself. Still, if you feel that you can do so yourself, you can watch this YouTube tutorial here. But soon loses power and bogs down. If your chain starts to spin, loosen the idler screw until it stops. It is possible that your Stihl chainsaw is dying when you give it gas if the carburetor, spark plug, chain, or air filter is malfunctioning. By a silver star and you can post unlimited pictures. Los Angeles, CA 90013 Thoroughly inspect your throttle trigger. myimages2[3]="../../../images/top-banner/behindtheforum.jpg" I have a MS250 that's only two years old and has barely been used. When a screw (e.g., anL screw) is tightened, the fuel flow to the carburetor is restricted, causing the mixture to be lean. How did you get the carb off? myimages2[2]="../../../images/top-banner/behindtheforum.jpg" Check the edges of the bar for burs and file off if needed. Add your pre-measured oil to the container, Add your pre-measured gasoline AFTER (not before) your oil, Seal your fuel container and swirl, not shake, to thoroughly combine the oil and gasoline, Once properly mixed, your gas and oil mixture will be evenly colored with no variegated streaks, Check your owners manual to locate your chainsaws air filter, Your chainsaws air filter should be visible at this point and can be easily removed from its housing with a screwdriver, After removing the air filter, wash it in soapy water and scrub with a soft-bristle brush until clean, Allow your air filter to dry thoroughly before replacing it in your chainsaw, Make sure that your chainsaw is off and cool (Heat isnt your friend here! If you observe any evidence of damage or wear on the air filter, I recommended to replace it. Next, check the spark plug to make sure it is clean and properly connected. Re: Chainsaw bogs on full . Take the appropriate screwdriver and align them. When a chainsaw bogs down when accelerating, it typically means the engine is not receiving enough fuel or air. Garden Tool Expert Similarly, adjust the other screws, namely the L and H screws, until the RPMs are at an optimal level that prevents the saw from burning out. To remove it you need to depress a small tab and slide the fuel line off. Required fields are marked *. After considerable usage, specific engine components like the crank seals and the head gaskets wear out and develop leakages. Chainsaw bogs on full throttle #63708 18/04/15 11:39 PM. There are a number of carburetor-related problems. I have never worked on anything this small. Madsens Shop & Supply, Inc.: Carburetor Adjustment on Pro Saws, TEK Indoor Environmental: Stihl Chainsaw Carburetor Adjustment, Beautiful houseplants that also repel mosquitoes, cockroaches and other pests, The Tools for the Adjustment of the Carburetor on Craftsman Chainsaws. Dealing with a carburetor requires strict guidelines to be followed. Clean it with a wire brush. var ry=Math.floor(Math.random()*myimages2.length) Its an essential step in properly maintaining your chainsaw to check and adjust the chain tension. Using a screwdriver, remove the air filter cover on the back of your chainsaw. To do this: Loosen each bolt about half way down using flathead screwdriver or small wrench (depending on size). In order to properly access the carburetor and get at its internal components, youll then need to disassemble the carburetor. The air filter in your chainsaw protects your chainsaw from dirt and debris by filtering it out before it can reach the engine. It will start up with some work, but it idles for a couple seconds then dies most of the time, and when it doesn't die on its own, it dies when I try to give it any gas. Most manufacturers do not recommend adjusting the tuning of your chainsaws carburetor outside the hands of a trained professional. After I got home I remover the spark plug and looked in there and everything looks good. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. When you depress the trigger, a vent on the carburetor opens, allowing more gas to reach the mixing chamber. When the high-speed screw on the carburetor is open too far, an excess of fuel enters the combustion chamber and not all of it ignites. This will keep your chain in place for the next steps. Begin by draining the fuel tank and draining the existing fuel from the carburetor. Cleaning it by immersing it in a soap water solution is preferable. This handy guide will cover the common problems that cause bog down and how you can keep it from happening in the future. Any of these could be a contributor to a chainsaw that's bogging down. Bog down is mostly experienced on full throttle. Hence, many people complain- chainsaw bogs down when I give it gas . Go ahead and buy a new fuel filter. You must log in or register to reply here. The first problem is that when the saw is tilted forwards or the chain brake is disengaged it stalls. Align the screws on the carburetor. Secure your chainsaw to maintain stability while working. Something may be amiss in the low or high speed circuit of the carb. Nearly every weekend you will find us doing small or big jobs or just enjoying our garden. As a result, the chainsaw will bog down at full throttle. It's the carburetor's job to regulate the amount of fuel in the cylinder, and it has been preset at the factory to accomplish that task. That should help improve the performance of the chainsaw and resolve the issue of your saw stalling when you give it gas. After checking and cleaning the filters, see if the carburetor orientation is proper. What Would Cause a STIHL Trimmer to Not Start? It has a new spark plug, clean air filter, n Chainsaw bogs down in cut in Chainsaws Have a Stihl 441 that starts and idles fine and even start cutting. If your chainsaws carburetor becomes clogged with dirt and debris, airflow is restricted and the chainsaws engine suffers. Page created in 1.341 seconds with 39 queries. (3 Common Causes). Maintenance is the key to sustenance. It bogs down it seems and stalls out when I open the throttle. The rakers are angled low to high with the high end in front of the cutter. JavaScript is disabled. The Job of the Carburetor One controls the fuel mixture when the engine is idling, one controls it when the engine is operating at low speed and one is for high-speed fuel control. If your chainsaw dies when you give it gas, make sure that the low-speed screw (L) and the idle screw (I) are correctly adjusted. A "rich mixture" occurs when you have too much gasoline with the amount of oil in your fuel mixture, resulting in a poorly operating chainsaw. As a preventative measure, always keep your tank vents clean. can cause a chainsaw to bog down when cutting. Together we put a lot of effort into the maintenance of our gardens over the last few years, we become obsessed with it. Jun 16, 2006. The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. This can be done with a vise, clamps, or any type of fastener that will stabilize your chainsaw. To carry out the low-speed screw adjustment, follow these steps: The chain may begin to rotate because the mixture is lean enough to engage the clutch after the low-speed adjustment. Inspect the clutch center, drum, and spring for any excessive wear. Why does the chainsaw bog down at full throttle? If the spark plug is cracked or damaged, you will need to replace it. Replace it if the quality has deteriorated. You will also reduce kickbacks and increase the overall safety of operating your chainsaw. I think I am having the same problem with mine. This article will help you fix your chainsaw by yourself that starts well but dies just after you push the throttle. Or maybe gas varnish in the screen filter at the base of the metering needle. Currently I live in Austin, United States. Then, remove the air filter and fuel filter. A couple of the small holes were plugged with what seemed like excessive oil, but once I blew on it it was clear. He pledges to come up with new knowledge about chainsaws every once in a while. To identify air leakage, you will need to perform a pressure test on your chainsaw. Clogging usually occurs due to long working hours. This dirt and debris can build up and create a clog. All internal or external factors that reduce the supply of combustible air causes bogging down. They include inspection of spark plugs, filters, and carburetor adjustment.Sparkplugs are a litmus test to the fuel economy of your chainsaw.A sooty plug is an indication of a rich fuel mixture resulting in frequent misfiring. Sounds like a blocked passage somewhere to me. The most common causes of a Stihl saw stalling out or stopping include clogged air filter, fouled spark plug, stale gasoline, low compression in the cylinder, insufficient fuel reaching the carburetor, blocked fuel lines, incorrect gap between the spark plug electrodes, a worn or broken drive belt, and inadequate lubrication of the saw chain. Without the right amount of air and fuel in the piston cylinder, the 2-cycle engine in a Stihl chain saw runs inefficiently and the saw loses power. Re-attach the carburetor cover and test the saw. The manual should give you the proper gas-to-oil ratio for your particular chainsaw. If the idle screw is too loose, the mixture will be too rich, and the chainsaw will not run at all, even at idling. Start the chainsaw for a few seconds to make sure the carburetor is functioning correctly.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'remodelormove_com-large-leaderboard-2','ezslot_10',158,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-large-leaderboard-2-0'); To unclog a chainsaw carburetor, youll need to thoroughly clean the carburetor and replace the air filter. After cleaning the air filter and spark arrestor, you should fill the tank, start the saw and let it warm up for a few minutes before adjusting the carburetor. One controls the fuel mixture when the engine is idling, one controls it when the engine is operating at low speed and one is for high-speed fuel control. If its clogged, replace it with a clean one. The last thing anyone wants is a saw that purrs when idling and bogs down when applying gas. 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. If your Stihl chain saw purrs like a cheetah when it's idling but stalls when you actually try to do some work with it, it could indicate the carburetor isn't adjusted properly. If youve checked both the fuel mixture and air filter on your chainsaw and still experience bog down, it may be time to move on to the carburetor. I asked my brother to take a look at it since he's fixed a number of chainsaws, and he says it looks like it isn't getting fuel. It is difficult to get the proper high-speed adjustment by ear -- most pros use a tachometer. I'm having trouble with my Stihl MS180 C-BE chainsaw. Why does my chainsaw stall when gas is given? Clean and/or replace the spark arrestor screen. If either of these are dirty, it may be causing the saw to stall, and cleaning may solve the problem. piston and cylinder is clean. Your manual will provide detailed instructions on how to do this. Jul 22, 2008. Misaligned screws can cause bogging down, smoking in the chainsaw, and lower performance efficiency. Once youve reassembled the chainsaw and replaced the air filter, check for any other issues, like clogged fuel cap vent, and make sure all the screws have been secured correctly. In some circumstances, vapor locks created in the fuel tank due to insufficient venting cause engine issues. You will need a round file that matches the diameter of your cutters, a flat file, a file guide, and a depth-gauge guide. The majority of these steps are listed above in the daily maintenance list, but one is of top priority: Chainsaws require maintenance to stay at the top of their game. Outside of family, He loves grilling and barbequing on his Big Green Egg and Blackstone Griddle, as well as working on projects around the house. Cleaning the air filter and spark arrestor with, Read More Chainsaw Bogs Down When CuttingContinue, Did you buy a new Stihl chainsaw, remember you cannot go and start using it like any old chainsaw. +1-213-221-0119, By using this website I agree with the Disclaimer. If the problems remain, examine the fuel lines and carburetor. Start by sharpening the cutting teeth of the blade first. Correct mixing of fuel ingredients. ry=1 Clean both of these components if they are dirty. We and our partners use cookies to Store and/or access information on a device. Over time, the spark arrestor can become clogged with soot. New Husqvarna 550XP had to be reprogrammed. Furthermore, the arrestor screen that catches the spark at the exhaust port is prone to carbon deposits. I think I am having the same problem with mine. If your Stihl chainsaw starts up with a reassuring puttering sound, but dies when you pull the throttle trigger, there likely is an issue with the fuel, but the carburetor could need. Read more about this in, "This is the Type of Gas to Use in a String Trimmer". This jet is usually responsible for controlling the fuel/air mixture. Fix your Lawnmower with our Lawnmower Troubleshooting tool. For professionals and homeowners, taking care of their chainsaws is very important. The Forestry Forum is sponsored in part by: Over time, the spark arrestor can become clogged with soot. imagelinks2[1]="https://www.youtube.com/c/TheForestryForum?sub_confirmation=1" Bog down is straight-up the most infuriating issue when using a chainsaw. When the mixture in the carburetor is too lean, the engine races and overheats and the piston can seize. Heres a quick rundown of daily, weekly, and monthly maintenance tips: Chains will loosen over time and use. The Low Speed is the setting I do 1st in or out a 1/4 turn to ensure no hesitation . The reason for that may be you're using the saw at altitude or the carburetor adjustment has simply slipped. The saw has been well used over the years (1998) and not really well looked after. Make sure that its leveled and does not tilt. Why does my Chainsaw Bog down when I Pull the Trigger? I think the problem is ethanol in gas, espesially gas . Older saws have degraded lines which need replacement. After a little looking, the two nuts that hold the back of the carb and filter housing were loose, I tightened them up and it ran like a top. A carburetor is a part of a combustion motor that mixes air and fuel in a specific ratio for combustion. Most Craftsman models have either a standard Walbro or a Zama carburetor.