You can use a 9/16" 6 point socket to remove it too. If the spark arrestor is clogged, the engine may stall o... r run roughly. It's just easier to do when new. Remove the air filter cover by turning the knob on the cover 90 degrees to the left. You may also replace the spark arrestor. Drain the fuel if the chainsaw has been idle more than three months. Even when the screen is clean there is a noticeable change in power and exhaust tone after pulling the screen. 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. Removing the screen will affect how rich your saw runs. 4229 140 6905 Muffler Stub Spark Arrestor w/ Screen STIHL Genuine Part. I would address that issue before I went back to cutting. Mufflers contain internal metal parts that stay hot long after the muffler housing cools. Removing the screen will affect how rich your saw runs. Stihl FS 200 Brushcutter. Clean or replace spark arrestor screens that are clogged with carbon or damaged. I've seen two ways that Stihl retains spark arrestors. The spark arrestor screen was pristine. OEM replacement muffler screens are a high quality option for Stihl chainsaws. Very easy repair. IT WILL BE TIGHT. You may also replace the spark arrestor. Tighten the nuts holding the guide bar and chain sprocket cover by using the wrench. Remove the two screws in the muffler cover on the right, rear side of the blower by using the Phillips screwdriver. Scrub out the muffler walls and along the exhaust port with the brush as well. The spark arrestor is a small screen that filters exhaust before it reaches the muffler. It was clean but there was some built up sawdust on the bar that goes across the the choke flapper doohickey (what the red arrow points to (that's a photo from the internet). Pull the spark arrestor from behind the muffler. Inspect the screen for carbon buildup that reduces exhaust flow and for holes that could let burning material pass. Verified purchase: Yes | Condition: New. I need to clean out a blocked two stroke/cycle muffler and spark arrestor on a string trimmer. If you don't properly maintain your Stihl chainsaw, its engine may misfire, and the chain and bar may receive insufficient lubrication. Check operator's manuals for specific maintenance suggestions for your machine. Cutting lumber and clearing brush with a chainsaw is dirty work, and it's important to clean the chainsaw regularly to keep its engine and chain mechanism working properly. 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. The spark arrestor is a small screen that prevents the engine from emitting sparks. Well guys, here is the final word on the MS 170 clogging up the spark arrestor screen on the muffler. Examine the spark plug's electrodes. If the spark arrestor is clogged, the engine may stall. Find the spark arrestor screen at the exhaust port of the muffler. Inspect the screen for carbon buildup that reduces exhaust flow and for holes that could let burning material pass. I would address that issue before I went back to cutting. I can't see a way to remove it without destroying it. Fourth, clean or replace air filter. Pull out the air ⦠The spark arrestor is a small screen that prevents the engine from emitting sparks. Lift the guide bar off the bolts or screws. Your stihl uses a screen type spark arrestor, it's a mesh screen that prevents large particles from leaving the exhaust system. Spray with carburetor cleaner until you can see through all of the holes in the screen. Set the screen aside to let it cool. 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