Unscrew the screws holding the muffler cover by using a screwdriver. Clean the air filter with compressed air or warm, soapy water. Stihl FS 200 Brushcutter. Adjust the tensioning screw by turning it clockwise. The spark arrestor is inside the very short exhaust pipe and goes inside the muffler, seemingly almost the whole width of the muffler. 4229 140 6905 Muffler Stub Spark Arrestor w/ Screen STIHL Genuine Part. It wouldn't be long until it would not run worth a spit. Find the spark arrestor screen at the exhaust port of the muffler. Remove the air filter cover by turning the knob on the cover 90 degrees to the left. To unclog the spark arrestor, remove it and clean it with a wire brush. Third, replace fuel filter in fuel tank. Stihl FS 120 Brushcutter. It's just easier to do when new. Remove all debris from inside the guide bar's grooves. Slide cleaned or new screens into place over the muffler exhaust port and fasten with the retention screw. I would address that issue before I went back to cutting. I need to clean out a blocked two stroke/cycle muffler and spark arrestor on a string trimmer. Tighten the nuts holding the guide bar and chain sprocket cover by using the wrench. For screen style spark arrestors the easiest way to clean it is by using a blow torch to burn the carbon away. The carburetor screws may need to be adjusted. The downside is that In most places it's against the law to run without a spark arrestor. Drain the fuel if the chainsaw has been idle more than three months. In most Stihl two-cycle engines, a single screw holds the screen in place. 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). Over time, the spark arrestor can become clogged with soot. Some models include emission control devices housed within the muffler and should not require service unless deformed or damaged. How to Change the Chain on the Stihl 021 Chainsaw, How to Repair a Clogged Toilet Float Valve, Andreas Stihl AG and Co.: Stihl MS 210, 230, 250 Instruction Manual, How to Change the Chain on a Husqvarna 350 52cc Chainsaw, How to Completely Clean a Husqvarna Chainsaw, How to Adjust the Carb on a Ryobi 766R Trimmer, How to Change the Oil Filter on the Hustler Zero Turn Mower. All Rights Reserved. Over time, the spark arrestor can become clogged with soot. Turns out the throttle linkage was mis aligned and it was running at half choke all the time. If none of these work please take the machine to your local authorized STIHL servicing Dealer for evaluation. 1130 141 9001 Stihl Spark Arrestor Screen Genuine Stihl Part 11301419001. I would have to agree with Mdavlee, there is no way your spark arrestor should clog that fast. To unclog the spark arrestor, remove it and clean it with a wire brush. "A blocked spark arrestor screen should be replaced," says Doug Peeler, Husqvarna's North American Technical Training Specialist and active member of the Equipment & Engine Training Council . Remove the two small screws on the spark arrestor screen plate, located on the muffler, on the left side of the blower. Remove the spark plug from its socket by using a spark plug wrench. Just remove the plug and you'll see the screen. This can be done after you have removed the screen from the muffler, or if it is easily accessible from the rear of the muffler you can even burn away the carbon with the screen still installed in … Although it will be somewhat of a minor change. Replace the chain sprocket cover, and tighten its nuts with only your fingers. Spray with carburetor cleaner until you can see through all of the holes in the screen. Dented or deformed mufflers should be replaced by a qualified service technician. Scoop out any severe buildup with the screwdriver tip. If the spark arrestor is clogged, the engine may stall o... r run roughly. "Every effort should be made to install a new screen before consideration is given to cleaning the existing one." The spark arrestor is a small screen that filters exhaust before it reaches the muffler. Oil in or on the muffler isn't unusual and will burn off during normal operation. 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. Slide cleaned or new screens into place over the muffler exhaust port and fasten with the retention screw. 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. Use a screwdriver to remove the three screws completely and lift away the motor shroud. I take the spark arrestor out when I buy them. Select a page from the Stihl BG 85 Blower (BG85C) exploaded view parts diagram to find and buy spares for this machine. Stihl recommends replacement by a qualified technician rather than home repair. Clean oil and dirt from the chain, the guide bar and the chain sprocket with a rag. Whether they get plugged up from carbon, or rust out from being heated up, they need to be replaced often. If none of these work please take the machine to your local authorized STIHL servicing Dealer for evaluation. Stihl FS 46 Brushcutter. Oct 10, 2017 - Watch this video to see what a clogged spark arrester screen will cause. Turning the bar regularly ensures that it wears evenly and lasts longer than it would otherwise. Locate three mounting screws that hold the engine shroud or top cover in place. Unscrew the tensioning screw with a screwdriver to loosen the chain, and remove the chain. Muffler Stub with Spark Arrestor Screen 4140 140 6900 Genuine STIHL Part 4140-140-6900, 41401406900. Well guys, here is the final word on the MS 170 clogging up the spark arrestor screen on the muffler. Clean the electrodes with a file, or replace the spark plug. Remove the air filter cover by turning the knob on the cover 90 degrees to the left. The smaller end fits the spark arrestor plug in the muffler. A Stihl spark screen has open area equal to 25% of screen area. Second, clean spark arrester screen in the muffler. Remove deposits from the spark arrestor by using a toothbrush. Stihl FS 250 Brushcutter. I would address that issue before I went back to cutting. Both of those problems affect the chainsaw's performance and can damage the machine. The spark arrestor is a small screen that prevents the engine from emitting sparks. 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