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This is usually behind the air filter, but if you have trouble locating it, consult your user manual. The H side means the high side and its adjustment.It is used to regulate the quantity of fuel that flows through the carburetor during fast paced RPMS.The L side of the chainsaw means the low side and it is used in adjusting the flow of fuel in the carburetor when there is a low RPM. Its worth noting that loosening a screw improves the fuel flow rate and enriches the mixture while tightening the screw has the reverse effect. A loose spark plug wire or incorrect gap can also be responsible for a poorly running string trimmer that bogs down. Stihl MS 180C running problems, bogging down, fuel starvation?? Clogging slows down the engine from in-taking fuel and air, which results in a bog down at full throttle. Make sure that its leveled and does not tilt. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. If your chainsaw doesnt start, adjust the carburetor screws till it doesnt bog down. I have cleaned the air filter, replaced the fuel filter to no effect. Guess its time to pull the carby down and check the diaphragm and mesh. Cleaning a carburetor on a chainsaw without removing it can be done with a few simple steps. The engine and its associated delivery system need to be airtight to maintain adequate temperature and pressure. As a preventative measure, always keep your tank vents clean. 0 Members and 1 Guest are viewing this topic. Remove the muffler. One of these is not being fed to the chainsaw in the proper ratio. Its all about adjusting the carburetor, and a slight change in the orientation can lead to Chainsaws Bog. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. I doubt it has more than four or five hours on it. Additionally, inspect the air vents on the engine to make sure they are not blocked by leaves or debris.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-banner-1','ezslot_4',157,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-banner-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-banner-1','ezslot_5',157,'0','1'])};__ez_fad_position('div-gpt-ad-remodelormove_com-banner-1-0_1');.banner-1-multi-157{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. I didn't run straight gas through it and it isn't sized up so I am wanting to dig into the carb myself. To check if theres a vapor lock, unscrew the tanks cap and put it back on again. Using compressed air, blow out the inside of the carburetor and around the gasket. The speed would be perfect, and there would be no unusual sound when the screws are properly aligned. If it is stuck, try loosening the nut to free it up. If your chainsaw is bogging down when you press the throttle, it can be a sure sign of an incorrect gas-to-oil ratio. One of the most common causes is a dirty air filter, which can block air from entering the chainsaw engine and prevent it from getting the oxygen it needs to operate efficiently. These screws are in charge of regulating the fuel flow to the carburetor under varied load circumstances. Required fields are marked *. The muffler looks easy enough to remove but I want to check out the carb. A couple of the small holes were plugged with what seemed like excessive oil, but once I blew on it it was clear. It is difficult to get the proper high-speed adjustment by ear -- most pros use a tachometer. When the chainsaw is unable to hit full power during the full throttle, it's a good sign that your chainsaw is bogging down. If it needs to be cleaned, take care to not damage it by using compressed air or a soft brush. http://www.ebay.com/itm/STIHL-017-MS170-018-MS180-Replacement-CARBURETOR-CARB-/130584786959?pt=US_Chainsaws&hash=item1e6775b80f, Quote from: rstarkie on June 06, 2013, 09:50:21 PM, Quote from: Submariner on December 14, 2018, 01:42:06 PM, Running problems Husqvarna 246 and Shindaiwa 457S probably bad fuel issues, Figured Out My Efco 251 Fuel Starvation Problem (shuting off after 4 or 5 min. It idles fine but after you rev it up it looses power. imagelinks2[1]="https://www.youtube.com/c/TheForestryForum?sub_confirmation=1" Find the setting at which the engine sounds best and the engine speed recorded by the tachometer in rpms is lower than the maximum recommended speed for the saw, as specified in the owner's manual. If the chainsaw continues to stall, the issue could be with the low-speed and idle screws, which should be adjusted. The carburetor might need: A clean-up if it's clogged. There are a number of carburetor-related problems. When your saw blade starts to dull, your blade will start producing powder, rather than chips. How to Adjust the Carburetor on an Eager Beaver Chainsaw. To unclog the spark arrestor, remove it and clean it with a wire brush. From falling trees to slicing timber, the chainsaw is a necessity - especially if you are in the lumber industry. Additionally, the choke might be stuck in either the open or closed position and preventing the engine from running properly. Select gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%. The Job of the Carburetor 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. Some issues can be solved at home with the right tools, and some need professional help. Adjust the screw using only turns before trying to start the trimmer again. Adjust the main jet by twisting the needle in either direction. 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. Answered by Patrick, Top 10 Best Chainsaw Bars Tested and Compared for 2023, How does a Chainsaw Carburetor Work? Remove the air filter from its housing using a screwdriver. The engine boggs down under a load and when just reving the saw. The above answer may be brief, but I will explain it in more detail, including how to fix a chainsaw that wont start. Hello, and thanks for visiting my site! imagelinks[3]="https://woodmizer.com/Store/Shop/Portable-Sawmills/LX25-Portable-Sawmill?utm_source=forestryforum.com&utm_medium=banner&utm_campaign=lx25&utm_term=2023-02-10&utm_content=800x160" if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,600],'remodelormove_com-mobile-leaderboard-1','ezslot_24',167,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-mobile-leaderboard-1-0');The T adjustment on a chainsaw is a tool-free tensioning system that makes it easier for users to adjust the tension of the chain. It has a new spark plug, clean air filter, n Welcome, Guest. When you depress the trigger, a vent on the carburetor opens, allowing more gas to reach the mixing chamber. I have ran many 2 stroke motor cycles and atv's and feel as though its a carb problem. The reason for that may be you're using the saw at altitude or the carburetor adjustment has simply slipped. The stihl oil from the dealer will have stabilizer already in it, they will usually tune it for you for free (only if you bought it there) I assume you checked/cleaned your air filter. You may have to contend with disassembling your carburetor to correct the mechanical issues bringing about the stalling.Before you to this drastic step first exhaust all possible causes of the problem. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Chainsaw bogs on full throttle #63708 18/04/15 11:39 PM. Stihl MS 170 bogging down, no power | Arborist, Chainsaw & Tree Work Forum Continue with Recommended Cookies. First, remove the old fuel line from the fuel tank. Apr 16, 2009. Remove the carburetor and check it for damage, cleaning it if necessary. If t present cleaning your tank isnt an option. It runs fine at all other times, cuts well and has good power. This article will help you fix your chainsaw by yourself that starts well but dies just after you push the throttle. The carburetor must be maintained, but first, check that your engines filters are thoroughly cleaned. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. If the spark plug looks good, check the fuel mix. 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. Lock the chain brake by pushing the handle forward. If your chainsaw bogs down after pulling the throttle, the air/fuel delivery system needs to be examined. All STIHL gasoline-powered engines can be used with up to a 10% (E10) blend of ethanol in the gasoline/engine oil mix. 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. Vapor lock occurs when the fuel vapor pressure builds up considerably in the fuel tank and isnt allowed to escape from the tank vents. For a better experience, please enable JavaScript in your browser before proceeding. If the spark plug is physically damaged, replace it. A dirty or damaged spark plug can cause it to misfire causing the string trimmer to run rough. ). 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. Chain filing isnt a difficult task and is crucial in maintaining your chainsaw. That explains why they run worse after i rebuild them! Inspect the fuel line condition. He tests chainsaws based on . Rotate the saw and file the remaining teeth using the same angle and motions as before. The new fuel cleans everything really good and what the fuel cleans ends up in the fuel filter or the carburetor screen. Loosening the screw, on the other hand, enriches the mixture with gasoline and lowers the RPMs to a set limit. Stihl Chainsaw Bog Down and Fix Pilot View Productions 4.54K subscribers Subscribe 11K views 2 years ago PILOT MOUNTAIN Does your Stihl or other brand chainsaw bog down and refuse. The L screw controls how much fuel enters the carburetor at low speed, whereas the H screw controls how much gasoline flows into the carb at high speed. Begin by draining the fuel tank and draining the existing fuel from the carburetor. To identify air leakage, you will need to perform a pressure test on your chainsaw. It would do the same thing, die when you give it fuel, It would also idle way down when I was adjusting the carb, not from turning the screws all you had to do was just push on it a little and it would almost die. It's all clean no cracks no discoloration nothing. 01 - Stihl Chainsaw Spark Arrestor. Once youve made the adjustments, make sure to monitor the performance of your saw over the next few days and readjust if necessary. When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust. We pulled out the carb and opened it up, and the check valve looked perfect and everything was as clean and shiny as you'd expect a basically brand new saw to look. or a blockage in the mesh strainer in the pump chamber. What causes a Stihl chainsaw to bog down? - remodelormove.com #1. 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. 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. Do not store a dirty chainsaw. When I remove the cover (13), I find the upper surface of the filter (2) heavily contaminated (this is an aftermarket eBay filter, perhaps it is not sealing properly? Tighten the idle screw with a screwdriver to fix this and see whether the engine RPMs rise. 6. How do you know what the best gas-to-oil mixture is the best for your chainsaw? Check, clean, and replace (if necessary) the air filter. Chainsaw bogs down in cut in Chainsaws - forestryforum.com if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-medrectangle-3','ezslot_1',155,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-medrectangle-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-medrectangle-3','ezslot_2',155,'0','1'])};__ez_fad_position('div-gpt-ad-remodelormove_com-medrectangle-3-0_1');.medrectangle-3-multi-155{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}You should also check the chain tension and sharpness and consider replacing the chain if that is necessary. When a screw (e.g., anL screw) is tightened, the fuel flow to the carburetor is restricted, causing the mixture to be lean. on Chainsaws. If your chainsaw doesn't start, adjust the carburetor screws till it doesn't bog down. If the plug checks out, try removing it and spraying it with aerosol-based cleaner. It's looking a little tricky to me. Locate their perfect setting at which the engine doesnt bog down when the throttle is applied. Why does my Stihl chainsaw dies when I give it gas? I do sharpen the chains myself using an Oregon 511A. Your chainsaws fuel supply system comprises the gasoline tank, fuel filter, fuel lines, and carburetor. Finally, replace the fuel filter and air filter and reconnect the spark plug. It could even bog down when given gas. The reason for. After this, check the air filter and carburetor for dirt and debris. Stihl ST251C Chainsaw Stalls when I depress the throttle. By properly troubleshooting and addressing any potential causes, you can prevent stalling or restarting problems with your Stihl saw. myimages[3]="../../../images/top-banner/LX25-FreeShipping.jpg" If the spark arrestor screen has become damaged, you should replace it. his personal experience and loves to share their nitty gritty details with his audience. Besides causing poor performance in the cut, the fuel that doesn't burn produces smoke that fouls the spark plug and air filter, which compounds performance problems. 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. 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. When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust. Clean it with a wire brush. A restricted fuel flow will reduce the power of your Stihl chainsaw. Dirt in the air filters This is one of the biggest culprits when dealing with chainsaw bogging down. Lastly, its time to play mixologist. Empty and clean, if needed. Stihl carburetors have three adjustment screws. LancelotLawns said: I bought a stihl bg85 blower/vacuum two days ago. When the L or idle screws are not properly set, the idle RPMs fall too low, causing the engine to stalland eventually stop. 1. Jun 16, 2006. Next, youll need to gather the right supplies for the job at hand. Anobstruction in any of these components may disrupt the fuel flow to the engine, leading to the engine bogging down while idling. The manual should give you the proper gas-to-oil ratio for your particular chainsaw. Re: Chainsaw bogs on full . After cleaning, attachit backto the gasoline tank. Re: Chainsaw bogs on full throttle . Location. For a detailed answer, read the causes section above. Why does the ECHO chainsaw bog down when cutting? This handy guide will cover the common problems that cause bog down and how you can keep it from happening in the future. If you have recently bought the saw or it has been sitting for a while and not used, the best option would be to clean the carburetor and set it according to the factory specs. If the gas is supplied to the chainsaw then the filters can clog easily. If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, Collect a new fuel line, a pair of pliers, and a screwdriver. Disengage the chain brake and manually advance through the chain until you reach your starting point mark. This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. I guage the rakers and grind them when necessary. Chainsaw starts but dies when I give it gas. If it still doesnt look clean, it might be time to replace it. Chainsaw Vapor Lock. Top 11 Best Chainsaw Sharpener Tested for Sharpening 2023, How do Chainsaw Chaps Work? Then, remove the air filter and fuel filter. A chainsaw is a tool, and no tool is perfect. Clear all dirt and debris from the saw body, chain, and bar. If needed, purchase the tools from a hardware store and make sure you have personal protective equipment (goggles, gloves, etc. ) myimages2[3]="../../../images/top-banner/behindtheforum.jpg" if (ry==0) Check the brake band for wear and tear. Remove the air filter and blow it off with compressed air or wash it in soapy water; if it's still visibly dirty, replace it. The use of stale ethanol-blended fuel, which creates sticky white deposits over time, is the most typical source of such clogs. What Would Cause a STIHL Trimmer to Not Start? When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust.