Its all clean just a blackish color. Author Topic: Stihl MS 180C running problems, bogging down, fuel starvation?? 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. Clear all dirt and debris from the saw body, chain, and bar. his personal experience and loves to share their nitty gritty details with his audience. //-->. There are a number of carburetor-related problems. Required fields are marked *. If the spark plug looks good, check the fuel mix. Why does my Stihl chainsaw bog down when I give it gas? You will also reduce kickbacks and increase the overall safety of operating your chainsaw. Also, use a clean cloth and some carburetor cleaner to wipe down the inside of the carburetor. If it still doesnt look clean, it might be time to replace it. Chainsaw Bogs Down? (4 Main Reasons + Solution) - Wood Hungry It's a small screen you can simply pull out after removing the muffler cover. If youre finding your chainsaw to be bogging down, check the issues mentioned above to see if you can save yourself a little time and money. What causes a chainsaw to bog down when accelerating? Fill the tank with the prescribed gas-to-oil ratio. Rotate the saw and file the remaining teeth using the same angle and motions as before. Imagine you are about to cut down or in the middle of cutting down a tree or wood, and your chainsaw bog down. If the air filter is clean, then the spark plug should be cleaned and gap adjusted to the manufacturers specifications. It is also its orientation that keeps it working smoothly on little or full throttle. Question: What's the reason for the chainsaw to die under heavy load? A clean and fixed carburetor is key to achieving full throttle performance. Secure your chainsaw to maintain stability while working. If the spark plug is physically damaged, replace it. 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 chainsaw bogs down will occur when your engine is starved of enough fuel or when there is termination in the connection between the carburetor and the engine. If there is too much gasoline in relation to the amount of oil used, this is known as a rich mixture and hence caused the chainsaw to run in an irregular manner. //specify random images below. For that you require a carburetor cleaner. 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. There is no hiding from dirt. Don't know how to post a pic of it on here. on Chainsaws, Started by bkkraft 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. Anobstruction in any of these components may disrupt the fuel flow to the engine, leading to the engine bogging down while idling. That explains why they run worse after i rebuild them! The dream of everyone in the lumbering field is to have a powerful and efficient chainsaw devoid of mechanical faults. Over 200+ free JavaScripts here! How Do You Repair a Chainsaw That Wont Start? No matter how tight the seal on the tank is, replace the gas every three months and use stabilizer. Adjust the air screw until the idle speed is consistent. I didn't run straight gas through it and it isn't sized up so I am wanting to dig into the carb myself. Step Three. Chainsaw Starts but Dies when I Give it Gas. Tips from a Pro Why does my Stihl chain saw bog down when I'm cutting? When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust . If your chainsaw doesn't start, adjust the carburetor screws till it doesn't bog down. If you don't know about the perfect amount . Always clean the outside of your chainsaw after using it to remove any dust or debris that may be present. Updated: 00/04/25 Now take and post a picture so we can see the exhaust side of the piston. If the plug checks out, try removing it and spraying it with aerosol-based cleaner. Solution: Here's the solution. Thoroughly inspect your throttle trigger. The carburetor must be maintained, but first, check that your engines filters are thoroughly cleaned. I ask if they checked the carb and they said no. Check the return/recoil spring and starter. You are using an out of date browser. Take great care in removing the smaller parts and remove any debris or build up in the carburetor. Next, check the spark plug to make sure it is clean and properly connected. This helps identify the compression. It is recommended to replace the fuel filter every year to ensure optimal performance and avoid any possible issues. Set the idle screw to the point just before the chain starts spinning and adjust the low-speed midway between the the two points at which the engine starts to die. before starting the process. Random Image Link Script- By JavaScript Kit(http://www.javascriptkit.com) It may not display this or other websites correctly. When you depress the trigger, a vent on the carburetor opens, allowing more gas to reach the mixing chamber. The spark arrestor is behind the muffler. Does Your Chainsaw Bogs Down When You Give It Gas? Here's What You Got Burnt plugs could mean the fuel combustion is too high or high ethanol concentration.To cure this, replace the sooty plug with a new one to prevent misfiring when cutting firewood.Ensure you adjust the carburetor to reduce the amount of gas used. We like to help other people maintaining their garden and find cool products to write about. There are many factors that cause a bog down, but mostly it is the carburetor orientation or blockage. /* Why Is My Chainsaw Bogging Down? +1-213-221-0119, By using this website I agree with the Disclaimer. Suppose that your chainsaws fuel mixture is correct, and youre still experiencing a lag in performance. The Author The dream of everyone in the lumbering field is to have a powerful and efficient chainsaw devoid of mechanical faults. I have cleaned the air filter, replaced the fuel filter to no effect. Stihl MS250 dies when I give it gas. | Arborist, Chainsaw & Tree Work Forum Wash it in soapy water with a soft-bristle brush. Guess its time to pull the carby down and check the diaphragm and mesh. 5. myimages2[3]="../../../images/top-banner/behindtheforum.jpg" The engine boggs down under a load and when just reving the saw. imagelinks[2]="https://woodmizer.com/us/Sawmill-Blades?utm_source=forestryforum.com&utm_medium=banner&utm_campaign=sawmillblades&utm_term=2022-05-01&utm_content=800x160" Chainsaw starts but dies when I give it gas. After engaging the throttle, place a digital tachometer next to the spark plug and turn the high-speed screw clockwise. L and H on your chainsaw. Its starts fine, but if you give it gas it will shut off. Frustrating, right? They wrote it up as I ran straight gas through it and seized it. If the problem persists, inspect the fuel lines and ignition system. (Read 66824 times) (Read 66824 times) 0 Members and 2 Guests are viewing this topic. I love to write about chainsaw for homeowners and professionals. 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. If the chainsaw continues to stall, the issue could be with the low-speed and idle screws, which should be adjusted. 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? This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. First, disconnect the spark plug wire and turn the engine off. Carb. This jet is usually responsible for controlling the fuel/air mixture. How did you get the carb off? 1 Hour1 Day1 Week1 MonthForever The manual should give you the proper gas-to-oil ratio for your particular chainsaw. Take the appropriate screwdriver and align them. The reason for that may be you're using the saw at altitude or the carburetor adjustment has simply slipped. 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. To unclog the spark arrestor, remove it and clean it with a wire brush. (Even After Sharpening). //specify random images below. Any factor that might affect supply can cause the chainsaw to bog down. If any part of that ratio is off (as previously mentioned), your chainsaw will experience a lag in performance. ry=1 Dirty Spark Plug Causes a String Trimmer to Run Rough. You should attend to all of those anyway, before you give it a clean bill of health. 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 carburetor is clogged or not adjusted properly, it can cause the saw to run out of fuel. Chainsaw Bogging with throttle pressure - Hearth.com Forums Home These are the low-speed screw (L), the idle screw (I), and the high-speed screw (H). Then it loses power when cutting. Chainsaw Dies When I Give It Gas - Solutions Explained in 2023 You should use mid-grade unleaded gasoline with a minimum octane rating of 89 and a premium two-cycle oil. Curtis B. Answer: Yes, a chainsaw can bog down if gas is supplied to it. The dirt in the air filters can often cause the chainsaw to stall. After checking that, soak the crank seals in motor oil (30w works great) and then give it a go. Chain filing isnt a difficult task and is crucial in maintaining your chainsaw. You can have as many as you wish 6. Adjust the screw using only turns before trying to start the trimmer again. So, lesser air is supplied to the carburetor and the saw bogs down. Inspect the clutch center, drum, and spring for any excessive wear. Confirm for water and debris in your fuel tank. Select gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%. 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/. A daily, weekly, and monthly check-up and cleaning must be performed for optimal performance. Why does my Stihl chainsaw bog down when I give it gas? Please Help! Chainsaw bogs and dies when revs | Tacoma World How to Prevent Your Chainsaw from Bogging Down Taking all of these potential issues into account and fixing them as needed should help to correct the issue and get your chainsaw running properly. Dirt in the air filters This is one of the biggest culprits when dealing with chainsaw bogging down. Cleaning a carburetor on a chainsaw without removing it can be done with a few simple steps. Then, remove the air filter and fuel filter. Stihl BG85 blower | Lawn Care Forum