If a worn throttle shaft doesn't appear to be the problem, check all of the intake gaskets for … 3 Answers. A string trimmer uses the same clutch mechanism as a chainsaw to prevent the working part of the tool from spinning when the engine is idling. When you pull the throttle, it increases or decreases the airflow and not the fuel flow . The spark plug’s job is to ignite the air and fuel mixture in the combustion chamber under any condition. A while back, it began to have an intermittent problem where it would only run … Video: Trimmer Does Not Accelerate At Full Throttle. Why Does My Stihl Chain Saw Bog Down When I'm Cutting? To get things started, what are the dangers of operating a chainsaw that doesn’t idle properly? If it doesn't stall, the cap vent hole may be plugged; and if so, you should replace the cap as well as the filter. AI products feature an integrated battery, great performance and enough run time to take care of jobs around the house on a single charge. Also known as a weed wacker or eater, a strimmer or a string trimmer and edger, your machine runs on manual controls that may occasionally need a troubleshoot. The bike sat for 1.5 years - changed battery, changed gas. Fuel filters are inexpensive, and it's more practical to replace a dirty one than it is to try to clean it. ... Stihl FS 38 and Hitachi of various modifications. 01 - Clutch. The STIHL AI Series is the complete package. I m having a problem keeping it running. a stall at wot usually means its running lean and a burnt piston and or rings with a cylinder to match. When you depress the trigger, a vent on the carburetor opens, allowing more gas to reach the mixing chamber. Discussion Starter • #1 • Aug 10, 2010. Hear A Slight Rattle Noise Seems Like It Might Need Internal Work. The choke on your Weed Eater -- or on any gasoline-powered trimmer -- is designed for one specific purpose, and that is to cold-start the engine. Just went to use my climbing saw today, and I couldn't keep it running. A new plug helped a little, but I wanted to tune up the carb, wondering if the previous owner maybe changed the settings. spark plug looks good. I picked up a used FS 91R the other day, and it runs ok, but the idle was really low, and seemed a little boggy at full throttle. This can cause internal engine damage. Hose, Tube & Fitting Parts Miscellaneous Parts Spark Plug Parts. The FS 55 is run by a 1 brake horsepower (.75 kilowatt) engine that operates between 2,800 and 9,500 revolutions per minute. The two-cycle engine that runs your string trimmer needs three things to operate smoothly: clean fuel, air circulation and a spark. 1 cleaned carb and air filter.2have fresh ly mixed gas. Oops, my bad, I'm usually pretty good about checking dates before posting. AI Series Battery Charge and Run Time Information. I am going to dump all of my gas, and get some fresh 97 octane (after putting about 2 gallons into my car i will then put 1 full fresh gallon of pure 97 octane in my mix jug for my weedeater) The clutch engages one or more drive shafts which attach to the trimmer head. I went out to the shop and removed the arrestor thing and it looks plugged. I have an Stihl (model 009) several yrs old which has given me good service, however now it is giving me a problem. It is 12 years old. Make the adjustments while the engine is warm. Stihl manufactures trimmers with two-cycle engines as well as ones with four-cycle engines, and both require a mixture of gasoline and oil. If it starts to surge badly at full throttle, you can shut it down to low idle and it typically runs good for 15-20 seconds and then it will stutter there too for a bit. 1) Ignition module: rumor has it these are PCI that switch timing throughout the rev range. Maybe try priming more (push the button well in 10 times). Then dies especially when I give it some throttle for some cutting. A blower is under a load at all times, a trimmer is under a load as long as the trimmer head is in place and the line is to the correct length. two stroke tuning is no secret and will make or break you. I also have an Ebay purchased $12 carb. I have a Stihl FS55R string trimmer. FS 75 FS 80 FS 85. They're both 2-cycle and both are set at the factory to run lean (will not hold idle). Relevance. Well, it depends on what type of idling issue we are talking about. To solve most issues that can result in a malfunctioning weed eater, you only need a few tools and little DIY knowledge. johnny3h. Also, if I let it idle, the rpm's will raise and it will die. I think this may be a gasoline issue. ... and no store stocks a full range, so you can go to 6 stores before you find what you want. I had a friend at the time that was a stihl mechanic and he said that there was even a service bulletin about it but it was not warrantied as it was considered a fuel issue (I know what your thinking). Do not operate the throttle, run the equipment only at idle speed until the engine stops!) It will idle, but won't run at high speed. You … Jan 11, 2012. In fact, it won't run at all unless the air filter is off. After running at full power for about 10 minutes, the engine speed slowly decreases until it barely runs. Do you have any suggestions on how to improve it? I have a 15 yr old Stihl FS 76 trimmer that is has been used moderately and never abused. If you give it a little choke (on click), it bogs down, and anything more than a tiny bit of choke (2 or 3 clicks aka. so annoying. Common solutions for: Stihl String trimmer won't start. Ease throttle on slowly once you turn off choke (or maybe leave choke half on until engine runs well). Starts normal, then it will run at half throttle, but when I give it full throttle it cuts out and dies. Will restart but still won't run very long. In this video I give youtubers the basic reasons .But in the follow up video in part 2. I have a bg55 stihl blower that is 6-8 yrs old and it wont idle nor run while a half speed, but will run all day long on high, wide open. Stihl FS 76 won't come up to full RPM at WOT 07-01-09, 06:13 PM. Discussion Starter • #1 • Jul 8, 2009. Any time that I have worked on anything with a plugged muffler you lose high speed. i completely serviced it about 3 weeks ago and it has been running great - full power, etc. The PO has high speed but no low speed?? Any suggestions. Great Opportunity At A Project Unit Or One To Use For Parts On Your Current Trimmer. Should haveentioned spark arrestor clean. ?? FS 48 FS 50 FS 52 FS 55 FS 56 FS 62. Sometimes you give gas, and the trimmer floats. Feb 29, 2020 #2 ; Check wire screen attach in front of muffler maybe … This spring when I got it out and shaped it up for the season it's taken to dying when I give it full throttle. that is the only number i have. Cap, Lid & Cover Parts Carburetor Parts Filter Parts. I have a four-year-old Stihl SH 85C blower that has developed a problem the last three times I have used it. Wildlife Bean Stalker. Yes " pinging the redline governor" is what I am referring to. With about a 30 second warm up a half choke. Stihl String trimmer won't start. my craftman 2cycl gas eater starts up but can not throttle up it will die. Thanks. My String Trimmer Continues to Spin During Idle. One reason why one of these trimmers may die at full throttle is that too much oil is in the gas, which causes poor combustion. I am trying to avoid a complete carb rebuild or replacement if possible but perhaps that is my only option. Lv 6. Next, hold the throttle wide open, and slowly turn in the high speed, until it really starts to smooth out and rev high, and starts screaming, then back this out until it starts to run rough or slows down. JavaScript is disabled. Lv 6. To check the plug for damage/corrosion, first remove the wire and connecting harness from the spark plug. my stihl trimmer won't run unless its on choke, why? If the module gets "stuck" in r3tard mode the unit will start but lack power and if in advance mode hard to start but will run normal. my stihl trimmer won't run unless its on choke, why? 3 Answers. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Each product also includes the battery and charger, so you have everything you need to start. Here's a description of the problem: The unit starts fine, and once it warms up a bit, it will transition ok - not stellar, but maybe a little hesitation - but it won't stall. I have to run it on half choke all the time or it will act like it s running out of gas and then stall. It wont stall however if I run it at almost full throttle. ... certain area that's the issue. 3 Posts . You must log in or register to reply here. now backfires on trying to start and won't start. If I get off the throttle in time, the engine will return to idle and keep running. Stihl fs55 weed eater. The choke restricts air flow to the carburetor, producing a fuel-rich mixture in the combustion chamber. Favorite Answer. If so, take the carb off and clean it out with carb cleaner and put on a new fuel filter. Sucks that they view those things as disposable. Unfortunately that carb will probably have to be replaced. Relevance. Basic Inspection Noted Unit Does Start Up & Run But Won't Continue Running Properly. The "R" Hear A Slight Rattle Noise Seems Like It Might Need Internal Work. Jan 11, 2012 #1 My MS 170 is about two years old. STIHL recommends that you do not run your engine at wide open throttle without a load. the kit says RB 89 rebuild kit. appears to be on front side, not exhaust side. a stall at full throttle is not to much oil in the mix. A dirty or clogged spark arrestor can also be disastrous and not allow the weed eater to run on choke off. full choke) and it will just kill the engine. Loosing low speed is more like a vacuum leak or carburetor problem. If you want to regulate the fuel flow, you can do it through the venture effect in the carburetor. hello , my stihl fs55 weed trimmer wont run at full throttle tried adjusting at … When working with the trimmer, you need to monitor its behavior all the time – a drop in speed and unusual noise signal a malfunction in the unit. The carburetor is factory-adjusted for sea level, and if you use the trimmer at high altitudes, it may not get enough air for proper combustion. A new plug helped a little, but I wanted to tune up the carb, wondering if the previous owner maybe changed the settings. weedeater is only 3yrs old. View Our Usage Chart. At half open choke, the unit runs faster, but stalls out if you try to use it. STIHL MotoMix ® contains no ethanol and has a storage life of up to two years. I run high test with stihl full synthetic. I have a bg55 stihl blower that is 6-8 yrs old and it wont idle nor run while a half speed, but will run all day long on high, wide open. I have a 326LS weed eater that has fire and gas but won't start. I explain more about the carb issues that plague these trimmers. stihl hs 45 hedge trimmer starts & idles, dies with throttle. if i turn it to run it dies. My Stihl weedeater won't run full throttle. Turn it back in to midway between these two positions. No matter what … All trademarks appearing on this page are the property of their respective owners. cutting wood) it starts to stall as though running short of gas. How old is it? Now primes real easy, starts real easy. Chainsaw Won’t Idle. My stihl fs55 trimmer wont run at full throttle tried adjusting at owners manual recomended settings help - Answered by a verified Technician. 01 - Spark Plug. Features of the trimmer. Shop by Popular Models. I tried spraying carb cleaner into the carb also pulled the low speed adj screw out and flushed it w cleaner, then reinstalled by lightly seating then backing out 1'turn per the manual. There are several things you can check. 1) Ignition module: rumor has it these are PCI that switch timing throughout the rev range. If you don't do this, the engine will sputter and die when you open the throttle, because too much fuel is in the combustion chamber to ignite. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. 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. I have a bg55 stihl blower that is 6-8 yrs old and it wont idle nor run while a half speed, but will run all day long on high, wide open. On most models, it's in the gas tank or on the cap. Answer Save. Answer Save. After that, adjust the "H" screw no more than one-quarter turn in either direction. Choke(!) A faulty spark plug may not allow your hedge trimmer to run properly at full power. Direct a stream of carb/brake cleaner on the ends of the throttle shaft while the unit is running, either at idle or wot---if the unit dies or falters that is one possible air leak. I have a Poulan Pro PPB335 trimmer which has been giving me trouble the past few weeks. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. What Causes a Stihl Weed Trimmer to Smoke? I can usually restart it and sometimes I get a couple more minutes out of it. We use cookies to give you the best possible experience on our website. or just the 1 turn out? A chainsaw is under a load when the bar and chain are in a cut. Most Stihl trimmer carburetors have adjustment screws for high- and low-speed operation, as well as an idle adjustment. Second, clean spark arrester screen in the muffler. Start with throttle off and choke full on. If it starts at all, it … FS 100 FS 110 FS 130 FS 200 FS 40 FS 46. If your grass trimmer only runs in choke, there are a few solutions that may fix the problem and let … Seldom had to run full throttle. Poor combustion produces carbon deposits that foul the spark plug and exhaust port, making the problem worse. MS170 Won't Run Full Throttle. Third, replace fuel filter in fuel tank. If the clutch assembly is worn out, it won’t be able to engage the drive shafts to rotate the trimmer head. It's just as important to regularly replace the intake air filter or clean it by spraying it with compressed air -- if it's the felt type -- or washing it with soapy water, if it's the foam type. When the trigger is depressed, a throttle wire opens a valve on the carburetor, allowing more fuel to flow in through the jets. Starter Parts Trimmer Head Parts. have you actually adjusted the low screw? was running great. was running great. With just a little maintenance and TLC, a weed eater can keep running season after season. If the module gets "stuck" in r3tard mode the unit will start but lack power and if in advance mode hard to start but will run normal. i am at a loss what to try next. If it still won't run, clean the spark arrester. It starts and runs well - except when operating at full throttle (ie.