), then you can … If it's running too slow, then probably it's either an over-supply of fuel because of a bad diaphragm or a diaphragm that's installed incorrectly. Then adjust for best running and idle. A bad fuel line will cause the chainsaw to run lean (too little fuel or too much air in the mixture), and this means it will only run at idle for 5 to 10 seconds before it shuts off completely. Interesting . Here is how to fix it, whether it is a clogged spark arrestor, bad fuel filter. My unit runs perfectly for 10-15 minutes and then slowly dies. Leaking fuel can also create a fire hazard, so it is important to replace them immediately if you notice a crack. Part of gasoline liquid can evaporate over time which changes its consistency and effectiveness. Answered! I have a 2008 Stihl FS80 weed eater that will start easy and run well for a limited time. 2 Next Reply Author. Next Last. The spark arrestor is a small screen that prevents the engine from emitting sparks. To access it, look to the top of the carburetor. Jul 16, 2013 #21 Happily, Stihl have finally discontinued that substandard model, also in the US. My other Stihl saws are running fine with the same ethanol free 89 octane 50/1 mixture. I doubt it has more than four or five hours on it. Your local stihl dealer will have a replacement part. Will run fine for 20-30 seconds then it dies. This part is inexpensive and replacement is recommended if there’s anything lasting wrong with it. Ground the plug to the head. 4,626 posts. Reply Prev of 2. If your chainsaw stalls instead of producing the reassuringly high-pitched sound of a healthy engine when you press the throttle trigger, something is … Go. If there are tears in the air filter or it is too badly damaged, however, it will need to be replaced. Discussion. Start it, run it, and then when it dies. If your chainsaw stalls instead of producing the reassuringly high-pitched sound of a healthy engine when you press the throttle trigger, something is interfering with efficient fuel combustion. HankG New Member. If you’re all topped up then great but add some fuel if you’re not sure. If you are looking for the solution to this issue, then read on the article to learn how to deal with this problem. My faithful stihl 024 chainsaw would start but not run today. My faithful stihl 024 chainsaw would start but not run today. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. But, if you have already messed with it, then turn both screws fully in and then 1-1/2 turns out and leave them like that until the engine has started. Running a chainsaw on bad fuel can cause long-term damage to the engine. OK, I seldom run into this with a new Stihl chainsaw, but I have a real problem with an MS251C. Joined Jan 13, 2005 Messages 64,853 Location Troms, North Norway. Chain Saw: Starts But Immediately Dies . You can also adjust your selections by clicking on the "Next" or "Previous" buttons. Worn crankcase seals and malfunctions of moving parts inside the engine itself can cause stalling. Outdoor Power Equipment Forum. Normal starting routine - prime, choke, pull about 3 times til it fires a little, then push choke off, pull a few more times till it starts. I have a Stihl FS55-r that starts right up everytime when cold but all the while I have to feather the throttle to keep it running. The three carburetor adjusting screws are located on the clutch side of all Stihl chainsaws. A dirty fuel filter restricts fuel flow, which also kills the engine. When gasoline is left standing in the fuel lines and carburetor, it partially evaporates, leaving behind a varnish-like substance that clogs the fuel system. Your Account. May 10, 2017 #1 Purchase a 10yr old MTD mower with a Briggs & Stratton 4.5hp at a yard sale. Many carburetors have adjustment screws, and you may be able to use them to get your engine working properly again. Sometimes, your chainsaw will only idle for about 5 to 10 seconds after you let off the throttle and then it will shut down. Sunday 8th February 2015. SawTroll Information Collector. I choke it, pull once it fires, turn choke off starts first pull. It has the new pull cord start assist mechanism that drives me a bit crazy. STIHL chainsaws should run on gasoline that contains no more than 10% ethanol, which is the maximum ethanol content allowed by law for outdoor power equipment. Over time, the spark arrestor can become clogged with soot. We use cookies to give you the best possible experience on our website. If you’ve worked to adjust to the carburetor and it’s still causing this problem, it is probably plugged. The fuel may also have moisture in it, and the moisture mixes with ethanol in the gasoline and settles at the bottom of the tank, which is where the fuel line is located. Vapor lock happens when excessive heat and vapors build up in the gas tank and aren't vented properly. A dirty air filter -- which filters air coming through the intake port -- or spark arrestor -- which filters the exhaust -- impedes air circulation and kills the engine. I doubt the saw has 5 hours of run time under its belt. flip to run 4-5 more pulls, now it quit all together. I've got a Craftsman 16" chainsaw that dies when you really get into some heavy cutting (read that, you run it at full bore under load for an extended time). Because a chainsaw is a high-speed Joined Jul 3, 2009 Messages 4 Location California. ... Stihl chainsaw dies under load A. austin on Nov 27, 2004. 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