Check the fuel filter, replace if dirty. Bosch 12v PS 31 Cordless Drill stopped working? I looked at buying a trimmer today. When the engine starts surging, back off the screw until it starts bubbling. Fill-up your bar oil. You can sign in to vote the answer. The spark arrestor is a small screen that prevents the engine from emitting sparks. View solutions. It won't matter if both are in the fuel but if the return line is out of the fuel and hooked to the wrong fitting on the carburetor you won't get fuel. 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. Find the most common problems that can cause a Stihl Chainsaw not to work - and the parts & instructions to fix them. First, check the bar oil. Adjusting air and fuel on the Stihl Chainsaw is a fairly easy job. The optimum setting is between these two extremes. Common solutions for: Stihl Chainsaw starts then stalls. If it starts up you likely have a fuel system problem, but if it doesn't start, your â¦ Check the fuel filter, replace if dirty. Is it possible for a cracked pipe to not be leaking? Rotate this screw very slowly clockwise and counterclockwise while noting the different noises from the engine. After the throttle is let go, the vent closes and a small amount of fuel is still let into the carburetor keep the engine idling. It sounds like the jets are plugged. Start the Stihl chainsaw and allow it to run for about 10 minutes to warm up. After finding the low speed setting, readjust the idle speed. Now try the high speed jet. The insides of the carburetor has to pump the gas using the pressure from the crankcase. Insert a small screwdriver into this hole and adjust the idle screw clockwise and counterclockwise to find the highest rpm before the clutch engages and the chain starts spinning. i am about to work on a friends chainsaw and he told me it starts then when you give it gas it dies. This is a 38% discrepancy. Readjust the gas/air screw after the engine warms up a little. I have a Stihl 800 cut off saw.When cold it starts right up. This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. Position the chainsaw bar so the chain won’t hit anything during adjustment. Replace the air filter if it can’t be cleaned. "Stihl MS 290, 310, 390 Service Manual" ; Andreas Stihl AG & Co.; 2004. Try to achieve an optimum balance of acceleration and power, but don’t over-adjust the screw so the engine is surging, which can damage the engine. Some things to think about. Your buddy will really think you are smart when you have fixed the chainsaw for him. Immediately upon turning off the choke it dies. He holds a Bachelor of Arts in creative writing from the University of Montana. Ive run maybe five tanks of gas through it since purchase. 5 possible causes and potential solutions . Ran for awhile, again with short stops, and the problem came back. I can keep it running if I feather the throttle, but it still wants to bog down and quit. His articles have appeared in "Outside Missoula, Outside Bozeman," "Hello Chengdu" and online at GoNomad.com and various other websites. New fuel and proper mix are a must before you start. Some things to think about. Drain any gas older than three days from the fuel tank and dispose of it according to local environmental regulations. Then we go rich and the engine starts to blubber, the RPM's drop, and the engine almost dies. Anyone with experience on Stihl 4-Mix feel free to chime in. Two, check the spark arrest screen in the muffler. Free repair advice! Fuel lines are another thing to check. Leave carburetor repairs to a mechanic if you’re not qualified. Check air filter, clean it. Here is what I did so far. You may also have a problem in the ignition module or the coil in the module. En español Live Chat online.