I have a br600 with the same problem. Run'er up to full throttle and adjust the Hi needle. I started looking for vacuum leaks, all 3 gaskets for the carb - insulator - cylinder were bad and leaking. I've read about other Stihl blowers having a similar problem, but not after 10 minutes of normal operation. Note the position of the screw (this is the rich position). At best, it will run at half throttle, but never at peak rpm. adjusted carb settings and got the saw to run. Once it … Saw runs like new for about 10 minutes +/ - a minute or two. I set the throttle to the cold setting and give it a pull, then switch it to warm and 1-2 pulls usually starts it, but it stops after a second or two. And you have adjustable mixture screws. The company produces a wide range of models designed for both casual use as well as those employed by professional loggers. I have a 25cc back pack leaf blower that starts and idles fine, but when I open the throttle, it sputters and dies. Or I can rev it up, and it will also die after a short period. Our repair guide can help you identify your problem and show you how to fix it with the right part. Seems like a fuel supply problem. A dirty air filter is one of the most common causes behind a leaf blower that is bogging down: the air is enough for the engine to idle, but as soon as you switch to full-throttle, the machine will stall. Hold the throttle wide open. Recently it will start and run fine for about 20 minutes, and then begin to choke down, lose RPM and despite trying to rev it up with the trigger, it dies… Blower: Runs For A While Then Dies . I have a Stihl BG 55 leaf blower. Andreas Stihl & Co. is a well-known manufacturer of chainsaws. Happy day! My Stihl MS 310 chainsaw dies a few seconds after I start it. It has a Zama C1M carb. All we need to do is replace the air filter. it starts right after again but it last less than a minute if is just idling will last longer. Alright then. Slowly turn it out, while listening to the engine. @Kingsford it would be nice if you would tell us if the the new ignition coil solved the problem. It starts right away and after a a few minutes of work it just shutdown. If the engine on your blower runs then dies, you might need to check the tank vent, ignition coil, or gas cap. It will, after a little bit, begin to slow, run roughly and may smoke. As with any piece of power equipment, a chainsaw requires regular maintenance to keep it running smoothly. I replaced the 3 gaskets, sprayed off the carb with carb cleaner. Recently it will start and run fine for about 20 minutes, and then begin to choke down, lose RPM and despite trying to rev it up with the trigger, it dies… After dying, it will not immediately restart. To do this, start by opening the air filter cover. Start the blower. If I wait a few minutes, it will restart (choke on). Classic fuel-starvation symptoms. The machine will start and idle for 30 seconds or so, then die. 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