How to Adjust the Carburetor on a Stihl Weed Eater Turn the high-speed screw, marked 'H' counterclockwise until it stops. #1. New fuel lines. How do you adjust the idle on a Stihl fs45? Stihl trimmer FS55 - DoItYourself.com Community Forums (Warning! The last (2nd) time I went to run it, whenever I gave it a lot of throttle (past 3/4) it tried to die, but letting off the throttle completely it also attempted to die. What Causes a Stihl Weed Trimmer to Smoke? | eHow Put in new fuel lines and fuel filter and clean out the carb. gideon. STIHL MotoMix ® contains no ethanol and has a storage life of up to two years. NOT just Leaf Blowers! How To Start A Stihl Weedeater (Quickly & Easily ... Be sure to depress the throttle to rev the engine before it dies. Stihl FS 76 won't come up to full RPM at WOT - Lawn ... An engine that requires the choking ( partial or full ) after initial engine warm up is an indication that the engine fuel air mixture system is out of adjustment. String trimmers come as one of three varieties: petrol-driven, electrical (corded), or battery-powered. #3. Same with no choke. Weed Eater Won't Run With Choke Off - 5 Reasons If your Stihl trimmer stalls at full throttle, this could be related to the air circulation. The fuel mixture on a Stihl weed trimmer is 50:1 gas to oil. I can get it to rev up by squeezing the trigger on and off quickly, but if I . 1. Here is what i have exactly: Stihl FS85 trimmer that has a Zama C1Q Carb. 2 . You go out to start your brush cutter, weed whacker, or string trimmer and it won't start. I have a Stihl string trimmer. How to start a weed eater stihl. If it's smoking, it means you've added to much oil to the mixture, causing it to be too rich for the engine. Wipe the spark plug dry with a shop towel; Remember these two points and position the screw so that it is somewhere between the two extremes. Do not operate the throttle, run the equipment only at idle speed until the engine stops!) To adjust, turn the screw a quarter turn without fail counterclockwise. This is a relatively common symptom and our repair guide can help you fix it. Bundu. Applies to all trimmers, blowers, hedge trimmers and some chainsaws. July 2014. Here is what I have done so far to fix it (nothing for me has worked yet): New fuel filter. I have had good performance from this beast. If your trimmer engine idles, but stalls on throttle, check the following parts: the gasket, primer bulb, fuel filter, air filter, fuel vent, fuel line, and carburetor. Now, the FS120, tt really doesn't want to idle. Do not operate the throttle, run the equipment only at idle speed until the engine stops!) . If you can't get the engine to run at full throttle, adjust the 'high' screw until it improves. Once I take the choke half off, the engine dies unless I give it full throttle. Usually, was able to fix a few things that way (like a microwave, a dishwasher, 2 mowers). The "L" screw is for low speed tuning, the "H" screw is for high speed (wide open throttle) tuning and the third screw (usually not labeled) is for idle speed adjustment. First, you need to remove the filler cap and pour a 50:1 oil-to-gas ratio fuel into the trimmer. 14 . 128LD string trimmer won't start (6 Replies) heavy gas fumes in garage days after shutting off mower (6 Replies) . STIHL MotoMix ® can be left in the machine during seasonal . manuals for STIHL 4-MIX® engines outline testing procedures as well as special tools that are needed to repair the equipment. Hold in the throttle trigger and pull the starter cord to start the weed eater. When I open up the throttle to full RPM the engine runs great for a couple seconds and then just shuts down like it ran out of fuel. When you depress the trigger, a vent on the carburetor opens, allowing more gas to reach the mixing chamber. Won't cycle up to full revs. STIHL recommends the use of STIHL MotoMix ® fuel which is pre-mixed with STIHL HP Ultra synthetic oil. I have a 32cc craftsman weed eater, model # is 358.791070. So I removed the shaft and started the engine. 4. If the throttle cable is broken, replace it. NOT just Leaf Blowers! Husqvarna Garden Tools, Grass Trimmers. 4. lowest, full choke, and pull four times or until it starts. Had new fuel lines last year, mostly ok til now. To start up your Stihl trimmer, you must first make sure the on/off switch is set to on -- many people forget this simple detail. Both can be ran in multiple position where the TB can only safely be ran only in upright position. Start the trimmer and gently unscrew the gas cap halfway off. The Diaphragm The throttle cable connects the throttle trigger to the carburetor. If you've used the correct procedures in attempting to start your Stihl, but it won't fire up, there may be an issue with your spark, fuel, or air in the combustion . Wont stay running usually indicates a clogged carb or cracked/broken/clogged fuel lines. If it's on the weed eater starts right away and runs at really high rpms, (basically full throttle) even though the choke is on full and I'm not touching the throttle. Check the Engine Condition. My Stihl weedeater won't run full throttle. Engine starts and idles great. 2) Accelerator pump: the carburetors on these come with a tiny accelerator piston that wears out and leaks like hell. In this video I give youtubers the basic reasons .But in the follow up video in part 2. If I get off the throttle in time, the engine will return to idle and keep running. is responsible for adjusting the engine at idle. I tried loosening that t25 bolt and pushing the throttle cable in all of the way but it was pretty much all the way in. Hold in the throttle trigger and pull the starter cord to start the weed eater. Fastest way to fix your unit if it doesn't rev up. Full Forum Listing. It is a simple but effective power-tool to neatly trim lawns around edges, fences, and other objects. Wipe the spark plug dry with a shop towel; I had to replace the carb 2 years ago because it got crapped up. Trimmer was working great, but then started to bogged at full throttle. Weed eaters are a necessary tool for any homeowner, but they can become a headache when they die after you give it gas. Continue to use sharp strokes to start the engine until it ignites. Cancel Post comment. Leaving the choke on while operating will result in excessive fuel consumption, irregular engine power performance and eventually may even damage the engine. The STIHL troubleshooting video and corresponding iCademy module are ideal checklists to use when performing repairs and will assist the technician in performing a step by step analysis of the machine. 2. Feb 29, 2020. However, you can buy a new card for it to function better. Press the trigger of the machine to rev the engine. Turn off the engine and remove the gas cap. Sometimes you give gas, and the trimmer floats. Before you start the saw, locate a small flat-bladed screwdriver. These procedures help in improving your chainsaw performance. Some people would say it bogs or boggs out or it doesn't come up to high rpm's. Common on fs38, fs45, fs55, bg55, bg50, and hs45. How I fixed my Stihl trimmer from bogging.It only takes 10 minutes to fix and its easy to do.Dont mind all the kids yelling in the background, its my daddy d. STIHL MM55 WONT START WONT STAY RUNNING - A few years back my trusty old MANTIS TILLER died after many years of faithful service. Summing It Up. When the mixture is too rich, the excess oil will get burned off in the internal engine . Stihl MS 290 oil leak. New coil pack, new spark plug, new air filter, oil level is fine. Post your model number for more specifics. To return the engine to idle, depress the throttle control when it starts. 01 - Spark Arrestor. When the cable is pulled, it opens the throttle on the carburetor to accelerate the engine. Posted: 08/05/2018. If the weed eater starts up without issue and stays on when you rev the throttle, you have fixed the problem. Troybuilt won't run full throttle . CLICK THIS— https://amzn.to/2znPHwh. Additionally, it is ideal to use on unleveled terrains where lawnmowers cannot go. They eventually replaced it just because of it's age. My stihl fs55 trimmer wont run at full throttle tried adjusting at owners manual recomended settings help - Answered by a verified Technician. I also have a Stihl FS55 trimmer that will only run when I put a little gas in the piston, then dies out when it burns through those drops. I figure one of the passages in the carb was clogged beyond de-clogging. Remember, when your Poulan chainsaw runs only with choke on, it surely . My string trimmer is a FS250 which is the last of the two strokes. Stihl weed eater won't start. Even when you try to repair it, it may not function the same. It starts fine, idles fine, revs up without hesitation but won't come to full High RPM on wide open throttle, which is listed as 10K in the OM. Start up the engine and allow it to warm up. 0 /1024. Applies to all trimmers, blowers, hedge trimmers and some chainsaws. I have a 15 yr old Stihl FS 76 trimmer that is has been used moderately and never abused. No matter what I did, I could not get it to work right. It is a steep learning curve but in the long run it was well worth it. STIHL recommends the use of STIHL MotoMix ® fuel which is pre-mixed with STIHL HP Ultra synthetic oil. Adjust the H screw the same way, but while the engine is running at full throttle. Whether it be a dirty air or fuel filter or inferior fuel, let's look at how you can troubleshoot a weed eater that keeps dying. {suc. The problem is if I quickly open the throttle all the way, it bogs down and stalls. One reason why one of these trimmers may die at full. I have a four-year-old Stihl SH 85C blower that has developed a problem the last three times I have used it. Louis @louis56. If the throttle cable is broken, the engine will not accelerate, and the trimmer head won't spin. Also tried lowering the idle with the idle screw to no avail.it did change the idle but wouldn't go low enough. We also recommend that if a unit will be left unused for more than 30 days that it be stored 'dry.' 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