Use a pipe cleaner or small-gauge finish nail for the task. If the screen is clear and intact, replace the motor cover. Carbon deposits in the muffler itself indicate problems with the fuel mix. Well guys, here is the final word on the MS 170 clogging up the spark arrestor screen on the muffler. Learn more about fuel concerns Read more â¦ 42291406905, 4229-140-6905 Fits STIHL models: BG55 BG56 BG85 BG86 SH55 … Clean out the oil inlet hole on the guide bar and the oilway on the engine housing just above the tensioning screw. OEM replacement muffler screens are a high quality option for Stihl chainsaws. One has a screw go through the screen. Once the screen is cool to the touch, re-install it in the exhaust â¦ I take the spark arrestor out when I buy them. Stihl FS 250 Brushcutter. Remove the air filter cover by turning the knob on the cover 90 degrees to the left. 42291406905, 4229-140-6905 Fits STIHL models: BG55 BG56 BG85 BG86 â¦ The smaller end fits the spark arrestor plug in the muffler. Fourth, clean or replace air filter. Reinstall screen and â¦ Locate three mounting screws that hold the engine shroud or top cover in place. I would address that issue before I went back to cutting. Your trimmer should have come with a spark plug tool. Brush carefully with a brass wire brush to loosen carbon. Scoop out any severe buildup with the screwdriver tip. I can't see a way to remove it without destroying it. Find the spark arrestor screen at the exhaust port of the muffler. Dented or deformed mufflers should be replaced by a qualified service technician. Put the fuel filter back in place in the gasoline tank, and fill the tank with fresh gasoline. Removing the screen will affect how rich your saw runs. You may also replace the spark arrestor. Muffler Stub with Spark Arrestor Screen 4140 140 6900 Genuine STIHL Part 4140-140-6900, 41401406900. Clean oil and dirt from the chain, the guide bar and the chain sprocket with a rag. James Young began writing in 1969 as a military journalist combat correspondent in Vietnam. Examine the spark plug's electrodes. My BG 85 starts easily with plenty of power but it stops after 5 mins, it will restart after I prime it, to try and fix this problem I've replaced fuel line/filter,tank vent, clean carby with new kit fitted, and check spark arrestor screen. Some spark screens are much bigger than the outlet, so that the screen open area is not a bottleneck. In most Stihl two-cycle engines, a single screw holds the screen in place. Stihl does not recommend owner servicing of all muffler types on its weed trimmer and brush trimmer machines. To unclog the spark arrestor, remove it and clean it with a wire brush. Stihl FS 120 Brushcutter. Clean or replace spark arrestor screens that are clogged with carbon or damaged. You can use a 9/16" 6 point socket to remove it too. Most chainsaws sold in North America come with spark arrestor muffler screens (also known as firescreens), to prevent forest fires in dry conditions. You might consider doing a muffler mod as well to wake the saw up. Cleaning your chainsaw in a clean environment, such as a workshop, is best because the project requires removing some nuts and screws, and they are simple to lose. Very easy repair. alt. Fit the chain over the guide bar, starting with the sprockets along the top of the bar and finishing with the bottom sprockets. Check operator's manuals for specific maintenance suggestions for your machine. Remove the two small screws on the spark arrestor screen plate, located on the muffler, on the left side of the blower. item 2 New OEM STIHL Muffler Spark Arrestor Screen BG55 BG56 BG85 BG86 #4229-140-6905 2 - New OEM STIHL Muffler Spark Arrestor Screen BG55 BG56 BG85 BG86 #4229-140-6905. Stihl Models this part fits (and more): Stihl FC 55 Edger. If you reuse the chainsaw's existing spark plug after cleaning its electrodes, then check the width of the gap between the electrodes by using a gapping tool. Stihl FS 200 Brushcutter. I would address that issue before I went back to cutting. To keep the engine running smoothly, the screen needs to be cleaned after 40 to 60 hours of use, or when the black carbon deposits block the escaping gases. Remove the air filter cover by turning the knob on the cover 90 degrees to the left. IT WILL BE TIGHT. Scrub out the muffler walls and along the exhaust port with the brush as well. Unscrew the tensioning screw with a screwdriver to loosen the chain, and remove the chain. Spray with carburetor cleaner until you can see through all of the holes in the screen. Avoid prying it with a tool, which can damage it. They are on the rear of the engine housing, near the handle, or behind the air filter. Learn more about fuel concerns Read … Remove the two screws in the muffler cover on the right, rear side of the blower by using the Phillips screwdriver. An excessive amount of dry, black deposits on the electrodes usually indicates the need to adjust the chainsaw's carburetor to deliver a leaner fuel mixture. Return the spark arrestor to its place behind the muffler. Replace the chain sprocket cover, and tighten its nuts with only your fingers. 4229 140 6905 Muffler Stub Spark Arrestor w/ Screen STIHL Genuine Part. Turns out the throttle linkage was mis aligned and it was running at half choke all the time. 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