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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. All internal or external factors that reduce the supply of combustible air causes bogging down. /* Your chainsaw bogging down is a common issue that youll face when wielding one, and it can quite quickly throw a knot in your woodworking projects. Here is a visual troubleshoot guide by Foxboss9 discussing the bogging issues and their solution: A Husqvarna chainsaw bogs down due to a clogged air filter or spark arrester. This may be one of the least anticipated causes of the problem, but it occurs in several cases. 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/. 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. Ben has a bachelors degree in construction engineering. myimages2[2]="../../../images/top-banner/behindtheforum.jpg" This issue can be fixed with the help of the user manual you received with the chainsaw. The effect of air leakage is that it upsets the composition of the air-fuel mixture. This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. Select gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%. The reason for. Dirty Spark Plug Causes a String Trimmer to Run Rough. //specify random images below. The imbalance of these components is one of the major reasons for bogging down. The ignition system is essentially a spark plug. The best/easiest way to do this is to poor some motor oil on the outside of the crankshaft and then also fill the engine with motor oil. //specify corresponding links below From falling trees to slicing timber, the chainsaw is a necessity - especially if you are in the lumber industry. if (ry==0) Get a carburetor repair kit before you begin clearing the blocked jets. It should be the first thing to check and clean. Adjust the idle speed. Then, remove the air filter and fuel filter. A carburetor is a part of a combustion motor that mixes air and fuel in a specific ratio for combustion. Gum clogs fuel lines and carburetor.The end result is less supply of fuel for complete combustion to run the saw. Question: What's the reason for the chainsaw to die under heavy load? Find the source of the issue and you can easily fix it. A clean and fixed carburetor is key to achieving full throttle performance. 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. on Chainsaws, Started by H60 Hawk Pilot on Chainsaws. Adjusting the idle screw, for instance, is a corrective measure for a chainsaw stalling when idle. 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. If the problem persists, inspect the fuel lines and ignition system. By, Read More Chainsaw Too Much Compression: Causes & SolutionContinue, Your email address will not be published. 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. Start by sharpening the cutting teeth of the blade first. Carburetors alone can be both the cause and the solution to a chainsaw bog down. 01 - Stihl Chainsaw Spark Arrestor. Next, you should check the air filter to make sure it is clean and not blocked by dirt or debris. How to Adjust the Carburetor on an Eager Beaver Chainsaw. Why does my Stihl chainsaw bog down when I give it gas? Use a 50:1 gas-to-oil mixture in your 2-cycle Stihl chainsaw. I love to write about chainsaw for homeowners and professionals. How did you get the carb off? This blog is written by a group of Garden Tool enthusiasts. The engine needs a precise mixture of air and fuel to run efficiently, and when the ratio is off, it can bog down. Lock the chain brake by pushing the handle forward. Generally, you will find the fuel filter on the fuel line, usually near the carburetor. Allow the cleaner to sit for five to 10 minutes and then wipe away with a cloth. This can be done with a vise, clamps, or any type of fastener that will stabilize your chainsaw. After the overhaul of the piston assembly I used this saw to cut up three rather large downed trees, and some other work. The majority of chainsaws operate on one of the three following gas-to-oil mixtures: If you have already mistakenly filled your chainsaw with the wrong fuel mixture, you will need to drain the incorrect fuel and replace it with the right mix. Still, if you feel that you can do so yourself, you can watch this YouTube tutorial here. Now that I'm all grown up with a wife and kids of my own, I hope to share all the knowledge I've gained over the years. Finally, replace the fuel filter and air filter and reconnect the spark plug. If your chain does not rotate, you can skip this step. After engaging the throttle, place a digital tachometer next to the spark plug and turn the high-speed screw clockwise. 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. Clean it with a wire brush. Re: Chainsaw bogs on full . The spark arrestor is behind the muffler. ), Using a specialty tool called a scrench or a combination wrench, loosen the bar nuts holding the clutch cover in place, Tighten the chain tensioning screw using your combination wrench or scrench while raising the tip of the bar and, Continue to tighten the chain until there is no slack on the underside of the bar, but it can still be freely pulled by hand, Tighten the bar nuts, return the clutch cover to its rightful place, and ensure that the bar is secure. Air Filter Issues. How did you get the carb off? var ry=Math.floor(Math.random()*myimages.length) In some circumstances, vapor locks created in the fuel tank due to insufficient venting cause engine issues. Check inside the fuel tank for dirt and debris. 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). After checking that, soak the crank seals in motor oil (30w works great) and then give it a go. The first step is to make sure that your chainsaw has enough fuel. Started by ellinghamso For a better experience, please enable JavaScript in your browser before proceeding. California. To adjust the tension on the chain, the user simply turns a knob located near the drive sprocket. :bang: I guess that all depends on your oppinion of what "compressed air" is or isn't Internal check valves? Chainsaw bogs on full throttle #63708 18/04/15 11:39 PM. Or maybe gas varnish in the screen filter at the base of the metering needle. Its an essential step in properly maintaining your chainsaw to check and adjust the chain tension. If the chain is loose or dull it may result in the saw not having enough power to keep running. #1. Manage Settings Why does the Husqvarna chainsaw bog down at full throttle? Remove the filter from the tanks bottom and clean the stale gasoline deposits from the filters jets with a metal wire. Solution: Use the user manual to locate the air filter. When the mixture in the carburetor is too lean, the engine races and overheats and the piston can seize. Even with the tiniest passage, it can make its way towards anything, including a spark arrestor and spark plug. I tried putting new gas in it and starting it up but it didn't make a difference. As a result, the engine runs at too high or too low RPMs. Just took off the muffler and it all looks good. First and foremost, you should check that you are using the correct fuel and oil mixture for your chainsaw. If there is none, then take off the cover and locate the carburetor. 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. Obviously pull the carb and exhaust when you do this. Heres a quick rundown of daily, weekly, and monthly maintenance tips: Chains will loosen over time and use. Chainsaw starts but dies when I give it gas. Check the tension and condition of your chain. skytower, Oct 3, 2010. Next, check the spark plug to make sure it is clean and properly connected. Another possible cause of a Stihl chainsaw bogging down is a broken or worn chain. The solution is easy and you can do it within a few minutes. In both cases, your chainsaw will be affected as it can damage the engine and your chainsaw might die off when you give it gas. If the idle screw is too loose, the mixture will be too rich, and the chainsaw will not run at all, even at idling. Over time, the spark arrestor can become clogged with soot. Finally, replace the air filter on the chainsaw. For instance: It is impossible not to lose power when the firewood chainsaw is being used constantly. 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. 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. Inspect the spark plug and replace it if necessary. /* 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. Take a measuring beaker and add oil and gasoline of the required amount according to the model of your chainsaw. My name is Chris Ross. Your email address will not be published. Before tossing your chainsaw in the shed, there are a few simple things you should do to ensure the longevity and productivity of your tool. Do not store a dirty chainsaw. Find the screw to adjust the idle speed. Remedy this by adjusting the high-speed screw. Over time, the spark arrestor can become clogged with soot. Following the L modification, the mixture composition should be adequate to keep your engine running. By: Author Olin Wade (Remodel or Move Stuff). Because of continuous firing, the spark plugs electrodes become damaged or acquire carbon deposits, reducing spark quality. 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. There are several factors may make your saw not work properly. Guess its time to pull the carby down and check the diaphragm and mesh. In case it is not the fuel ratio, it might be dirty or clogged air filters. 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. Make sure they are closed at a distance and neither touching the engine and not too far from it. Run a check on your chainsaws cooling system. Firstly, what instigates the chainsaw Bog down? You will need a round file that matches the diameter of your cutters, a flat file, a file guide, and a depth-gauge guide. 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. This can be quite annoying, especially when you have loads of work piled up and a mechanic isnt available. A loose spark plug wire or incorrect gap can also be responsible for a poorly running string trimmer that bogs down. The saw has been well used over the years (1998) and not really well looked after. An incorrect mixture is also known as a rich mixture which can be caused when there is too much gas as compared to the oil. I think the problem is ethanol in gas, espesially gas . I hope my epic guides will help you to choose,buy and maintain chainsaw. Any factor that might affect supply can cause the chainsaw to bog down. The effective supply of Air is key to a healthy chainsaw engine.You should ensure that there is enough air supply to the engine to avoid issues in the combustion chamber.Yourengine will clogonce the incoming air supply is blocked or less in supply.Once you work for a very long time without allowing your Chainsaw to rest, get ready because the filters will clog.These can be accompanied by smoking as a result of rich fuel and oil mixture.The solution to this problem is using compressed air to clean the carburetor jets and passages. Its all about adjusting the carburetor, and a slight change in the orientation can lead to Chainsaws Bog. Make sure to properly lubricate your chain with chain oil and check the compression in the cylinder. Clean and check the function of your chain brake. Chainsaws can start and then stop for a variety of reasons, so its important to take the time to diagnose the problem before attempting to start it again. It idles fine but after you rev it up it looses power. A Stihl chainsaw can bog down for a variety of reasons. Wash it in soapy water with a soft-bristle brush. random_imglink() After this, check the air filter and carburetor for dirt and debris. The chainsaw will bog down or stop running. 5. Top 11 Best Chainsaw Sharpener Tested for Sharpening 2023, How do Chainsaw Chaps Work? . A dirty carburetor is likely to cause Chainsaw Bog.In this case, the speed of the chainsaw will dwindle a great deal.Dirt in the spark arrestor or air filter can also cause the chainsaw to bog. Cleaning Tips The goal when diagnosing issues with bogging down is to implement a quick fix and avoid any disassembly (like the carburetor). Its worth noting that loosening a screw improves the fuel flow rate and enriches the mixture while tightening the screw has the reverse effect. Thanks for the replies; I'll try out these suggestions. In case you have lost it, the majority of chainsaws follow the following gas: oil ratio.