The optimum low speed setting for your Stihl will be between the bubbling and surging. When the sawyer depresses the throttle trigger, a small cable opens up a vent on the carburetor, allowing more fuel into the chainsaw's carburetor. This morning, cut for maybe five minutes with the usual intermittancy, same ole same ole. Check air filter, clean it. Currently based in Minneapolis, Minn., Eric Blankenburg has been a freelance journalist since 2000. This is a 38% discrepancy. View solutions. It will not start with starting fluid sprayed into the throat. Slowly we lean the low speed adjuster until the idle climbs and it then starts to die. Also check the muffler and make sure it is clean. Drain old gas and rinse the tank. Reduce heat! For maximum performance and engine life expectancy, we also recommend using STIHL HP Ultra 2-cycle engine oil. runs well for about 20/30 seconds then dies. 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The insides of the carburetor has to pump the gas using the pressure from the crankcase. It still won't start. En español Live Chat online. Adjusting Air and Fuel On The Stihl Chainsaw. Andreas Stihl & Co. is a well-known manufacturer of chainsaws. Actually the kit has a front and a rear diaphragm, so change both. I have a craftsman chainsaw that will start right away if cold but when I shut down to sharpen the blade or refuel it won't start up unless I let it cool for 20 minutes or so. Learn which plants thrive in your Hardiness Zone with our new interactive map! The screw marked with an “L” controls the low speed fuel mixture on the carburetor. I would take it back apart and make sure that all the passages are clean. Fuel lines are another thing to check. I prime it, start it with choke and let it idle, idles fine, hit the gas past 1/3 throttle it dies like it's fuel starved. If you for instance cut 3- 6" block with it and lay them and then come back to start it, it is difficult to startâ¦ When the sawyer depresses the throttle trigger, a small cable opens up a vent on the carburetor, allowing more fuel into the chainsaw's carburetor. Remove the air filter pad and shake off all the dust with your palm. 5 possible causes and potential solutions . How do you think about the answers? any diagnosis welcomed! It has a green choke tap that can be pulled all the way out for for full choke and pushed half way in for half choke. Adjusting air and fuel on the Stihl Chainsaw is a fairly easy job. stihl 029 main bearing and seal kit aftermarket stihl crankshaft main bearing and seal kit. The spark arrestor is a small screen that prevents the engine from emitting sparks. Common solutions for: Stihl Chainsaw starts then stalls. This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. Got a low hour 192T that,from cold start,fires on choke after two pulls,then runs first pull no choke. The carburetor kit is about $8 (depending where you go) and takes but a couple of minutes to replace the diaphragm. The fuel and air mixture in any gasoline-powered engine is regulated by the carburetor, and the carburetor in a Stihl chainsaw is pre factory-adjusted to provide the best performance. Mix a fresh supply of Stihl chainsaw fuel and fill the tank. When the engine starts surging, back off the screw until it starts bubbling. Readjust the gas/air screw after the engine warms up a little. Before adjusting the carburetor,you need to clean the fuel and air systems. Starts when cold. Let it cool down and then start it, screw in the air/fuel mixture screw about 1/4 turn at a time and give her a few wide open runs between each turn until it sounds raspy or shows little to no smoke. Its like sticking a banana in the exhaust of a car. 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. You can sign in to vote the answer. Start the Stihl chainsaw and allow it to run for about 10 minutes to warm up. Remove carb and work it over, cleaning all parts with fresh gas. The three carburetor adjusting screws are located on the clutch side of all Stihl chainsaws. Just some thoughts. It also dies if you squeeze the trigger too quick. "Stihl MS 290, 310, 390 Service Manual" ; Andreas Stihl AG & Co.; 2004. Some things to think about. i am about to work on a friends chainsaw and he told me it starts then when you give it gas it dies. Just start out 1 1/2 turns from light seat and try in or out a little until you find the power you lost. Can a glass shop replace the top on a glass cooktop or does one have to go to the manufacturer of the stove? The screw marked with an “L” controls the low speed fuel mixture on the carburetor. Depending on the make and model you could have an air leak between the carburetor and the intake. Never use a chainsaw if the chain still spins while idling. 01 - Spark Arrestor. Your Account ... Chainsaw starts then stalls. Note: STIHL recommends use of fuel with no more than 10% ethanol content. I have a Stihl 800 cut off saw.When cold it starts right up. 1-800-269-2609 24/7. Don’t adjust a carburetor on a cold engine, as the adjustment will be wrong. i am getting paid for this so any help is welcome thanks. In my MS 271âs case, it weighs 17 lbâs with an 18â³ Stihl bar running Stihl Rapid Super chain. It sounds like the jets are plugged. Leave all high-speed adjustments to a Stihl mechanic. It also has a red switch that you push in to shut off. If the Stihl chainsaw stalls after cutting, it is likely from problems in the carburetor, which will require an adjustment. Now try the high speed jet. Check the fuel filter, replace if dirty. Stihl 261. Over time, the spark arrestor can become clogged with soot. No Video Available. Add a cap-full of Seafom to the gas and this will stop the gets being gummed up. After finding the low speed setting, readjust the idle speed. Should you turn off water when leaving house vacant for a month? If the Stihl chainsaw stalls after cutting, it is likely from problems in the carburetor, which will require an adjustment. If it starts up you likely have a fuel system problem, but if it doesn't start, your â¦ compare to oem and save for the following stihl models: 029, 029 farm boss, 029 super, 039, ms290, ms290 farm boss, ms310, ms390 * noise tested before and after lubrication * passes v2 noise vibration standards for smaller bearings and v3 for larger bore 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. Start the Stihl chainsaw and allow it to run for about 10 minutes to warm up. Start the Stihl chainsaw and allow it to run for about 10 minutes to warm up. If the fuel hose is dry rotted or mushy inside the gas tank, its not going to allow fuel into the carb. 2. Adjust the low speed jet for best idle. A cleaned fuel and air system, combined with a properly adjusted carburetor will solve most minor engine and carburetor problems. Position the chainsaw bar so the chain won’t hit anything during adjustment. First, check the bar oil. Still have questions? Trimmer is a Stihl RX100 that looks to be in great condition. Chainsaw running rough. 49 A small engine question. If the problem continues you may have to rebuild the carburetor. I will start on them today. Then adjust for best running and idle. Stihl Chainsaw Dies Under Load ; What you'll hear is an idling saw. ), then you can take the next few steps. Are you sure that you got the fuel lines right? 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. If you have an issue transitioning from low to high speed open the low speed jet a quarter turn. I can keep it running if I feather the throttle, but it still wants to bog down and quit. Stihl Chainsaw starts then stalls. Now the saw starts and runs, but wants to die under load. Ive run maybe five tanks of gas through it since purchase. Fails to restart when hot. Start it up and let it warm up. The optimum setting is between these two extremes. Leave carburetor repairs to a mechanic if you’re not qualified. If the spark arrestor is clogged, the chainsaw may run stall or run rough. Check air filter, clean it. I have a stihl dr 400 backpack blower which has developed a problem. His articles have appeared in "Outside Missoula, Outside Bozeman," "Hello Chengdu" and online at GoNomad.com and various other websites. You may need to move the Master Lever to open up the choke if the engine starts up then dies right away. As I posted in another topic, I recently bought a saw (Stihl 029 super), the saw blew up, after about 6 hours of operation, due to aftermarket wristpin circlips coming out and now I just put a new bigger Farmertec motor assembly in with â¦ My faithful stihl 024 chainsaw would start but not run today. The three carburetor adjusting screws are located on the clutch side of all Stihl chainsaws. Then we go rich and the engine starts to blubber, the RPM's drop, and the engine almost dies. However, if the Stihl is getting older, over seven years, you may need to remove the carburetor, disassemble it and clean it. Position the chainsaw bar so the chain wonât hit anything during adjustment. 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. 1. Bosch 12v PS 31 Cordless Drill stopped working? Sparkplug, clean and gap. You may also have a problem in the ignition module or the coil in the module. ... Then it woldnt start. Set it aside, went back, started right up. Again, run the chainsaw until it quits and then squirt a little starter fluid into the open choke valve, underneath the air filter. Check the fuel filter, replace if dirty. However, the machine only runs on choke. Immediately upon turning off the choke it dies. Clean the carburetor parts in a bath of unmixed fuel and brush off any hardened material carefully, so as not to damage the gaskets and diaphragms. He holds a Bachelor of Arts in creative writing from the University of Montana. Hey everybody! All Rights Reserved. A plugged screen will not let the exhaust gasses out backing the system up. Free repair advice! Drain any gas older than three days from the fuel tank and dispose of it according to local environmental regulations. Check all fasteners especially around the carburetor. Fill-up your bar oil. Putting it back together with the old parts won't get you anywhere usually. 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. Fuel Tank Vent Line Fits Stihl 021 023 025 028 029 038 039 048 MS290 MS310 MS390 042 AV, P 835, P 840 OEM 1117-350-5800, Everest Parts Brand 4.5 out of 5 stars 92 $8.49 $ 8 . Here is a few findings that I hav uncovered that I have not yet passed on to my other support person. The screw marked “LA” controls the idle speed. The fuel if too heavy with oil can rob power. If I open the throttle fully it quits instantly. 1st I replaced the fuel filter in the tank, then â¦ One, make sure fuel hoses are good and solid. Don't use any of the generic "good for everything" oil. Replace the air filter if it can’t be cleaned. Your buddy will really think you are smart when you have fixed the chainsaw for him. If i keep my flickering lights turned off will a fire start in the house. Is it possible for a cracked pipe to not be leaking? Sparkplug, clean and gap. Ran for awhile, again with short stops, and the problem came back. More specifically, youâll want to turn your chainsaw off, and let it cool down for awhile. Do not mess with the adjustment screws, as they are pre-set. If they are old, cracked or brittle replace them. Some things to think about. 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. Check all fasteners especially around the carburetor. Because powerheadâs can be fitted with a great variety of bar/chain combinations, there is a great range of weights involved, and it would be unfair to â¦ As with any piece of power equipment, a chainsaw requires regular maintenance to keep it running smoothly. Inspect the inlet control lever and needle arm, as they are likely not seating properly and causing the engine to stall out after the jets close. Noticed the fuel line was seriously degraded. New fuel and proper mix are a must before you start. The problem with this is the carburetor is old and you need a carburetor kit. Push the throttle at halfway and pull the rope until the saw is running. Get your answers by asking now. When I push the primer bulb, I can see fuel flowing thru the fuel line from the tank to the carburetor. When it does, turn it out 1/4 turn and try that out. It costs a little more, but you really don't go through that much of it. Here is what I did so far. If you take the carburetor apart put a rebuild kit in it. Get some quality oil like Stihl. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. If you adjust the carburetor ith these systems dirty, when they finally get cleaned, the adjustment will be off, which can destroy the Stihl 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. If I leave the choke closed it will run at full throttle, but very lean, so I am pretty sure it is a fuel problem. Once the chain/bar is cool to the touch (donât burn yourself! Two, check the spark arrest screen in the muffler. Find the most common problems that can cause a Stihl Chainsaw not to work - and the parts & instructions to fix them. Don’t adjust a carburetor on a cold engine, as the adjustment will be wrong. Join Yahoo Answers and get 100 points today. It starts fine from cold, runs fine for 10 to 15 minutes, then stops and wont start â¦ The diaphragm inside the carburetor gets old and hard and is no longer able suck the gas using the crankcase vacuum. Anyone with experience on Stihl 4-Mix feel free to chime in. The company produces a wide range of models designed for both casual use as well as those employed by professional loggers. 3. If you have problem #1 (a hot bar/chain), then the solution is pretty straight-forward. Plan the perfect garden with our interactive tool →, Chainsawr: Adjustment and Tuning of a Chainsaw Carburetor. Rotate this screw very slowly clockwise and counterclockwise while noting the different noises from the engine. 4. Donât adjust a carburetor on a cold engine, as the adjustment will be wrong.