Use a starting fluid and letting it run flushes gunk out of the jets as an alternative to rebuilding the carburetor. :bang: I guess that all depends on your oppinion of what "compressed air" is or isn't Internal check valves? If the drive belt is worn or broken, replace it with a new one as soon as possible. To identify air leakage, you will need to perform a pressure test on your chainsaw. The engine boggs down under a load and when just reving the saw. Classifieds - Engine/Transmission/Transfer Case, BJ42 | FJ43 | BJ44 | FJ45 | FJ45LV | HJ47, North American Clubhouses - Central Region, CA.AB- Rocky Mountain Land Cruiser Association, CO/WY- Horsetooth 4 Wheelers Cruiser Club, TX- Lone Star Land Cruisers - Austin Chapter, TX- The White Trash of the Elwood Chapter, CA.BC- Okanagan-Similkameen Land Cruisers, NV- Battle Born Cruisers of Northern Nevada, Vendors: Accessories - Electronics - Recovery, sthil pics pictures by naturalite - Photobucket, http://s820.photobucket.com/albums/zz130/naturalite/sthil pics/. 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. 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. On most models it is either just below or just above the carburetor and secured with a metal clip. While you are in there, check the spark arrestor screen to make sure it is clear and that there is not any debris clogging it. The carburetor has three adjustment screws marked on it. or a blockage in the mesh strainer in the pump chamber. It is responsible for mixing fuel and supplying it to the engine. The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. When your Stihl MS 170 chainsaw drops its power under full load, it generally means there is an improper mixture of fuel and air in your carburetor. Most Craftsman models have either a standard Walbro or a Zama carburetor. As previously stated, the carburetor comprises three screws (L, H, and I) for managing the engine RPMs at low, high, and idle speeds. I hope my epic guides will help you to choose,buy and maintain chainsaw. Secondly, its about time we take a look at why your chainsaw suddenly stops working.The carburetor is like the vein in engines.Once it is clogged, the free flow of air and fuel will be blocked and the engine will be starved of fuel.To quell this issue, wash away the diets using the carburetor cleaner.In some scenarios, washing away or cleaning the carburetor may not be effective, hence, you should consider buying a new carburetor or repairing it.A clogged fuel tank can also cause the chainsaw to stop working.In such cases, endeavor to drain the old file from the chainsaw SNF ensure that the fuel tank is devoid of fuel. var ry=Math.floor(Math.random()*myimages.length) Required fields are marked *. Adjusting the H screw will help achieve optimal performance. The carburetor might need: A clean-up if it's clogged. You can follow these simple steps to remove and clean your chainsaws air filter: You should note that if your air filter continues to look dirty after cleaning and drying, it is time to fully replace the air filter with a new unit. Move the piston up in bore a bit more so we can see the piston below the ring and turn your flash off. Cleaning your chainsaws air filter can lead to an improvement in performance and really should be done as part of your routine chainsaw maintenance schedule. Then it loses power when cutting. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-leader-2','ezslot_17',164,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-leader-2-0');If the fuel lines are blocked or restricted, clean or replace them accordingly. 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. All STIHL gasoline-powered engines can be used with up to a 10% (E10) blend of ethanol in the gasoline/engine oil mix. I'm having trouble with my Stihl MS180 C-BE chainsaw. Carburetors alone can be both the cause and the solution to a chainsaw bog down. My name is Chris Ross. Oct 29, 2011. Dirty Spark Plug Causes a String Trimmer to Run Rough. If your chainsaws carburetor becomes clogged with dirt and debris, airflow is restricted and the chainsaws engine suffers. Your email address will not be published. //specify random images below. First, youll need to pull out your reading glasses and take a look at your chainsaws owners manual. Bog down is straight-up the most infuriating issue when using a chainsaw. If your chainsaw is bogging down when you press the throttle, it can be a sure sign of an incorrect gas-to-oil ratio. Also, use a clean cloth and some carburetor cleaner to wipe down the inside of the carburetor. Wash it in soapy water with a soft-bristle brush. The Low Speed is the setting I do 1st in or out a 1/4 turn to ensure no hesitation . What it needs is proper maintenance on a daily, weekly, and monthly basis. A well-maintained chain-saw seldom stalls. To unclog the spark arrestor, remove it and clean it with a wire brush. myimages[6]="../../../images/top-banner/EZ-junior.jpg" Allow the cleaner to sit for five to 10 minutes and then wipe away with a cloth. On the first day the crew used it, it was bogging down. Dont forget that a maintained chainsaw is a working chainsaw! The gasoline filter can be found at the bottom of your fuel tank. You will need to position your file depth gauge so that the arrows are pointing toward the nose of the chainsaw bar. The L screw, for example, controls the gasoline entering the carburetor at low/idle RPMs, whereas the H screw regulates the fuel flow at higher RPMs or wide-open throttle (WOT). One of these is not being fed to the chainsaw in the proper ratio. Check the spark plug as well to examine the ignition system. All fuel supply components must be independently examined to address these difficulties, as discussed in the following sections. We also recommend that if a unit will be left unused for more than 30 days that it be stored "dry". Take them out and clean them using a delicate brush. Do not store a dirty chainsaw. For professionals and homeowners, taking care of their chainsaws is very important. 453 S Spring St Ste 400 Your chainsaws fuel supply system comprises the gasoline tank, fuel filter, fuel lines, and carburetor. Stalling is a symptom of a complication in the chain-saw. Getting frustrated. (Read 66824 times) (Read 66824 times) 0 Members and 2 Guests are viewing this topic. There are a number of carburetor-related problems. Make sure to properly lubricate your chain with chain oil and check the compression in the cylinder. Even with the tiniest passage, it can make its way towards anything, including a spark arrestor and spark plug. You should attend to all of those anyway, before you give it a clean bill of health. He tests chainsaws based on Save my name, email, and website in this browser for the next time I comment. If the chainsaw continues to stall, the issue could be with the low-speed and idle screws, which should be adjusted. After reassembling the carburetor make sure the gaskets and seals are airtight. The Forestry Forum is sponsored in part by: Next, check the spark plug to make sure it is clean and properly connected. A couple of the small holes were plugged with what seemed like excessive oil, but once I blew on it it was clear. Adjusting the idle screw, for instance, is a corrective measure for a chainsaw stalling when idle. If it needs to be cleaned, take care to not damage it by using compressed air or a soft brush. Chain filing isnt a difficult task and is crucial in maintaining your chainsaw. There is no hiding from dirt. You can have as many as you wish This makes the engine flood and as a result, the chainsaw bogs down. If its clogged, replace it with a clean one. Make sure to take out the spark plug before removing the filter. A dirty or damaged spark plug can cause it to misfire causing the string trimmer to run rough. When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust. No particular problem restarting. I have replaced the spark plug (properly gapped), rebuilt the carb, replaced the fuel line and the fuel filter, cleaned out the chain brake and the clutch and cleaned the fuel tank air pressure stabilizing valve. If a chainsaw is bogging down when it is throttled, this indicates that the gasoline to oil ratio supplied to the saw has been incorrect. random_imglink() However, if you decide to clean your carburetor use a thinner to clean the gum buildup.Ensure the important plastic parts are removed due to the thinners ability to dissolve plastics. The muffler looks easy enough to remove but I want to check out the carb. 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. Re: Chainsaw bogs on full throttle . Thanks for the replies; I'll try out these suggestions. Check the edges of the bar for burs and file off if needed. It's a small screen you can simply pull out after removing the muffler cover. 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. can cause a chainsaw to bog down when cutting. Found the problem. The inability to reach full power during a full-throttle trigger is also a sign of bogging down.Remedy this by adjusting the high-speed screw. imagelinks2[1]="https://www.youtube.com/c/TheForestryForum?sub_confirmation=1" Updated: 00/04/25 The ignition system includes the spark plugs, ignition coil, and exhaust muffler. keep cutting with precision and efficiency. I have a MS250 that's only two years old and has barely been used. Aside from that, there are a number of other causes that can cause a bog which are as follow: The motor of a chainsaw is a combustion system that depends on an adequate ratio of gas, oil, and air. When a clog occurs, your engine will not get enough air to operate effectively. If there is none, then take off the cover and locate the carburetor. This article thus covers all causes and solutions to why does my chainsaw bogs down when I give it gas problem below: In a chainsaw both fuel starvation or termination of the connection between carburetor and engine can lead to a bog down. Be sure to check your models owners manual for the exact location of the fuel filter as it can vary from model to model. The spark plugs spark quality degrades over time, making it impossible to ignite the air-fuel mixture in the combustion chamber. In some circumstances, vapor locks created in the fuel tank due to insufficient venting cause engine issues. Air Filter Issues. I have a MS250 that's only two years old and has barely been used. It could even bog down when given gas. Loosening the screw, on the other hand, enriches the mixture with gasoline and lowers the RPMs to a set limit. Take great care in removing the smaller parts and remove any debris or build up in the carburetor. This may be one of the least anticipated causes of the problem, but it occurs in several cases. Any factor that might affect supply can cause the chainsaw to bog down. 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. The inability to reach full power during a full-throttle trigger is also a sign of bogging down. I do sharpen the chains myself using an Oregon 511A. A clogged air filter or spark plug can cause your chainsaw to start and then stop. If your chainsaw wont stay running, there are several steps you can take to try and fix it before seeking professional help. Its starts fine, but if you give it gas it will shut off.