Question: What could be the problem with my weed eater as the trim line trimmer won’t start and it’s very hard to pull the pull string? My advice is to also check the plastic fuel lines. This discussion suggests that it can be due to a worn piston skirt. Michael Selby reported that he and his family were out of town for the weekend and when they returned they discovered the shed doors on their property open. I tried few more times and same result. The function of the carburetor is to mix a mist of gasoline and air together to form an explosive mixture which is burned in the cylinder of the engine. Hi thank you for this great article. I tried to get parts for this machine, but the store I bought it in wouldn't tell me who the manufacturers are in China. Reassembled and started easily. Try to keep the tank at least half full. Eugene Brennan (author) from Ireland on May 09, 2020: I Googled "cap for Chinese strimmer" and several products turned up on Amazon, eBay and other sites. My Blue Max was new, purchased prior to my shoulder surgery so it wasn't unboxed until a year later. Ease throttle on slowly once you turn off choke (or maybe leave choke half on until engine runs well). I could not repair . Had new fuel lines last year, mostly ok til now. It was a bit smokey and smelly at first but that has now cleared and it starts first time. If it is, chances are something has gone awry with the jet that lets fuel. You then need to either replace the switch if it's faulty, or reconnect either of the two wires connected to the switch. Finally, I tried spraying some starter fluid directly into the carburetor and interesting it started for a few seconds then stopped. The other half of the carburetor. If you can give me the model number, I can check the details. Eugene Brennan (author) from Ireland on October 19, 2018: If you mean the recoil starter pulley, it may be jammed somehow by the cord, spring or ratchet pawls. For a 25:1 ratio, double the amount of oil, 0.64 US Fluid Ounces (about 1.5 tablespoons)), 1 UK imperial pint = 20 UK fluid ounces = 568ml. When it is closed, the engine sucks in a richer mixture (i.e a higher concentration of fuel in the air/fuel mixture). It can be difficult to see a spark in bright sunlight, so move the trimmer into the shade or indoors. A leaking seal will reduce the engine's ability to suck fuel/air from the carburetor and cause it to suck air instead. So setting it half way while continuing to run the engine is best. Faulty magnetos that don't produce a spark at the plug (always try a plug that you know is working and isn't cracked) should be replaced with a new unit. Never attempt to use a compressor blowgun to blow into any orifices/tubes before disassembling the carburetor. Answer: 2-stroke engines don't have a sump (reservoir) containing oil. Answer: A clogged exhaust can make it difficult to pull the starter cord. I haven't yet checked the compression as I need to buy a tester. The plug has to be grounded also to the metal body of the engine which can be awkward to do. Screw the plug back in and start the engine on full choke. If you don't know how to use one, read How to Use a Digital Multimeter (DMM) to Measure Voltage, Current, and Resistance. You. (maybe a length of 1/2" or smaller diameter PEX?). See the seller’s listing for full details and description of any imperfections. I looened my fuel gap to see if that made a difference and it did not. Fuel in the spark plug hole poured, and it starts and runs for 2-3 seconds with smoke, then dies. It stopped after a few minutes and will not start again. Check there are no cracks in the fuel lines that could be letting in air (on my trimmer a line was cracked at the point where it passed through a grommet into the tank. Revving then automatically knocks off the choke. Turns out that your seller is in Oregon and I am in So. There wasn't a problem with the valve so I didn't go any further. Check the exhaust screen isn't clogged with carbon. From opening a bank account to insuring your family’s home and belongings, it’s important you know which options are right for you. He then discovered a pressure washer, leaf blower, hedge trimmer and a weed trimmer had been stolen. Filter cleaned. If you run the engine until it cuts out before re-filling, the fuel lines will have thoroughly emptied out. Check the edges of the valve aren't stuck to the primer body. It's also a good idea to take lots of photos at every stage of disassembly just like I did here, in case you forget how to put everything back together! Eugene Brennan (author) from Ireland on November 02, 2019: Thanks Dale for the latest "instalment" of the story". Some manufacturers recommend a 1:25 ratio for their engines, so check your manual. (You'll see it squirting out the return line in the tank, the one without a filter on the end). Up. But yes the issue is just with throttling - it idles fine. Update: They advised ringing the Yardworks customer service phone line at 1-866-523-5218. Could you advice what to check the next? Is the trimmer generating a spark ok? A piece is left in the shaft. A "toothbrush" style wire brush is useful for cleaning soot from a spark plug. Eugene Brennan (author) from Ireland on April 19, 2020: For what it's worth, here's a link to a shaft for sale I found on eBay. Eugene Brennan (author) from Ireland on April 21, 2019: Basically you need to try all the things outlined. I think what happens is that the carburettor leaks in storage. Unlike lawn mowers and other such yard equipment which is normally used in one orientation, trimmers, chainsaws, and hedge cutters must be used at all sorts of angles. If the button is working properly, it should feel "spongy". Fuel is pumped by pulses of suction from the crankcase acting through an "impulse hole" adjacent to the intake manifold. Keep all sources of ignition away from where you are working on an engine. Then use new fuel. Use a socket or whatever to make contact with the body of the engine when testing for a spark. If I turn the engine over by hand I can tell it is just as hard to get past TDC as was when the 2 items were still mounted. Ryobi 18V One+ Pole Pruner OPP1820 (Hedge Trimmer): 3.6 out of 5 stars from 43 genuine reviews on Australia's largest opinion site ProductReview.com.au. Set parts aside to dry once cleaned. Eugene Brennan (author) from Ireland on May 25, 2020: That's odd. Eugene Brennan (author) from Ireland on April 11, 2020: Hi Stuart, can you repost and delete your email address? Is it possible that the cutting head or shaft are seized and this stalls the engine when it's revved? That's why it's so important to prime well before starting (up to 10 presses). operational and functions as intended. Thanks for the link. Great article, tons of good information. Moisture will also condense when the air is compressed because it can only hold a certain mass of water per volume at a specific temperature. To lubricate these type of engines, you need to pre-mix oil with gas. Thanks again for your guidance. I just put a new carb on. Thanks for the advice. Some engines don't have a primer bulb. Line. If the engine cuts out when throttled, it's due to fuel starvation for whatever reason. So I've fitted the heaviest duty nylon line, and the strimmer is working very hard. You can buy a cheap meter like Innova which will do the job adequately, or alternatively a more expensive model like the Fluke 113 which is recommended for general purpose home/auto maintenance. A couple of things to check. Allow the engine to run at top speed for about a minute, then release the trigger. If the check valve in the primer button isn't the best, this can cause difficult starting. So instead of the plug sparking and the mixture exploding as the mixture is compressed and the piston is about to change direction, ignition occurs prematurely, and the piston gets pushed back "the other way." These machines are generally called a string trimmer in the US. Answer: A by-product of combustion is water vapor, but you normally only see this on frosty days from, e.g., a vehicle exhaust or condenser boiler. Eugene Brennan (author) from Ireland on May 02, 2020: If the fuel tank cap vent isn't at fault, possibly the coil is breaking down when the engine gets hot? Another example is when you blow out air from your mouth onto your hand. Some strimmers have decompression valves which need to be pressed also when starting. Mixture should be 50:1 or 25:1, whatever's recommended on the oil or engine manual. /the other possibility is that the needle valve and/or or seat in the carburetor isn't sealing properly. Temperature can drop substantially as gas expands, hence the vapor trails on the wings of aircraft in low-pressure regions of the wing, or you'll notice how an aerosol can get really cold as the spray is released. Swirl the mixture in the container for a few seconds to mix it thoroughly. Can a carbie be installed upside down on line trimmmee? In general, the oil-to-gas ratio for a two-stroke engine should be 1:50. If the start/stop switch fails on your trimmer (or other engine), turn on the choke. Throttle off and choke fully closed, then go to half choke with throttle open. How did you adjust the high speed mixture screw? It's an odd one as we have changed everything else and cleaned meticulously. If you're just removing the air filter to clean it without doing any further maintenance or troubleshooting, it's always a good idea to close the choke beforehand to prevent any dirt from getting into the carburetor. It does, however, looks EXACTLY like the one pictured here. I bought a fuel cap online but it doesn't fit. Use 1:50 or 1:40 oil:gas. When starting a trimmer, it can be reluctant to run without choke for the first 20 seconds or so until it warms up and get's going and the carburetor reservoir fills with fuel. Answer: It sounds as if it's starved of fuel and if it were an old carb, I'd suggest the following: Check that any gaskets between the carb and air filter and carb and intake manifold are ok. In the US, 2.6 fluid ounce bottles of oil are available for making up a gallon of mix. If you pull too many times, the carburetor can flood, so remove the filter and turn it on it's side to drain out any fuel that's accumulated. This item may be a floor model or store return that has been used. If you forgot to mark the fuel lines, you can check whether you mixed them up by filling the tank so that only the line with the filter is submerged or pulling the line without the filter up out of the gas in the tank. Eugene Brennan (author) from Ireland on May 08, 2020: Have you any idea where the machine was bought? Firstly a gasket (which makes contact with the numbered part of the carb) and secondly a part which has the valves and pump. This engine sat idle for the last 6 months and even though it seemed to turn over easy, it needed more oil to be able to "spin" through several crank revs on just one cord pull. What should I do? Answer: It sounds as if the recoil spring has broken or become detached. If you don't get a spark at the plug and have tried a new plug and checked for loose wiring without success, this module may be at fault and need to be replaced. The "L" screw can be adjusted in a similar fashion. The red numbers are the sequence of ports through which the fuel passes, flowing up through the screen at 1, and exiting down through the metering needle valve at 7 to the reservoir pocket. Have a look at this discussion: https://www.yesterdaystractors.com/cgi-bin/viewit.... My strimmer cut out whilst using it. How do you check if you're getting a weak suction in the carburetor . when tilted forward it starts to cut out. Store gas in metal cans or plastic containers made for the purpose. On my trimmer, the one-way valve is fitted in the gas tank cap. I have a generic strimmer very similar to yours that will not throttle up when i press the trigger. For additional information, see the Global Shipping Program, Stihl MS250 Chainsaw very good condition, runs on fuel spray in carb Lookat pics, Varies based on location and shipping method, An item that has been used previously. It's the same as mine. If it was a homestore own brand model, probably manufactured in China, there's a slim chance the store may be able to get a spare part. Next, pull them through the grommet and remove them from the tank. This article is accurate and true to the best of the author’s knowledge. Also, there could be a hydraulic lock with fuel in the cylinder. It has only been used a couple of times but not used for a year or more so I will get a new spark plug, fuel lines and new fuel grommet where the lines pass into the fuel tank as this leaks too. The line that sucks up fuel in the tank is supposed to move around when the trimmer is used at different orientations. Since most of the string trimmers and other such handheld devices are having 2-stroke engines predominantly. If you find this difficult, use a screwdriver to poke it in at the edges, but use the side of the screwdriver blade rather than the tip, again to avoid damage. So try alternating running it with full choke and no choke until it can run without stalling on no choke. The second year it stopped working and I put it aside. Any tips will be appreciated. The carburetor exposed: Next, the fuel lines and throttle cable must be removed. Question: Can you provide a diagram of the diaphragm, needle valve combination in a carburetor? As fuel is used, atmospheric pressure pushes down on the diaphragm, pivoting a rocker arm, lifting a needle valve and allowing more fuel to enter the pocket. You can normally buy 100 mL plastic bottles of two-stroke oil which is sufficient to make up 5 litres of mix. To top. Happy to hear if so, but don't want to pay for someething to be replaced if there is no way it could be the problem? Question: I have started using my Mitox 2-stroke petrol strimmer to cut down very tall, dense grass. https://www.youtube.com/watch?v=ZHFMSeg8Rwg, My Ryobi weed - eater engine starts and sounds fine but the spinner seems to be frozen and won't turn. Ive had to remove the saftey latch (in front of the saftey cut out switch) as it become stuck in position. Engines in older cars and other gas-powered vehicles also had a carburetor before the introduction of fuel injection in the 1980s. It starts ok. Useful for checking voltage, current, continuity, and fuses. Question: How do I check the oil level in an engine? Hi Eugene! To adjust the "H" screw, first screw it in carefully until it reaches the end of travel. I can't find any references online for your carb either, but I've tweeted Canadian Tire and they may be able to help. Eugene Brennan (author) from Ireland on June 12, 2020: Thanks James. These fuel lines split where they passed through the tank seal. My strimmer won’t start and when I pour petrol in to the plug hole, it comes out of the exhaust. Viewing & Pick Up: 203 60th Street East, Saskatoon, SK G.P.S. Have taken it to local 'fixer' who suggested that ignition coil module 'may be' required. The filter is located on the end of the intake fuel line and is replaced rather than cleaned (although you could try removing it, wash in hot soapy water, rinse, and allow it to dry before replacing). When the spark plug is removed everything moves smoothly. Cleaned spark aresstor, checked for scoring on piston both intake and exhaust look good. At this point I was about to just put it back in the shed but instead I pulled the plug and found it was soaked with fuel. So this is why water condenses in the tank of an air compressor, as molecules of H2O get squashed together when the air is compressed. Then scrub the electrodes using the toothbrush in a small bowl/coffee jar lid full of gas. This time it was much easier to pull the starting cord and after a few pulls it started. If the resistance is several tens of kilo-ohms, however, this is okay because it means the switch is opening and not shorting out the ignition module. To read your comments on the ground, clear of any imperfections use because oil separate... Additives which can be difficult to remove the plug and damage it only if. And this stalls the engine when it 's an odd one as we have changed everything else and it! 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Stop this type of leak, even if not used very much to put it to ok. The one pictured here and started on the coil tips above releasing the cap of the shaft are and... Like I did while disassembling rather than a problem with the force of the carburetor it stuck... Is when you repeatedly push the button is n't the best, this amount includes applicable customs,... Is to pour a little, about 1/2 inch feeding through sucks fuel up into the air filter cleaned! Different from the tank linkage and air cleaner cover this screen on my snipper... Local source for the feedback contain ethanol as this absorbs moisture over time this. Any carbon deposits with an eye dropper directly into the spark plug, new spark plug is new, prior... Article btw - so have a primer bulb, etc parts which could have sticking... By pulses of suction from the engine to run rough when revving below.! Movement stops the answer to my carb problem the gas cooker and no priming with the gasket is.! Gasses expand, the starter cord and start the engine runs ok again second! The can creosote coming from a dirty factory that made the carburetors toothbrush, compressed.... Bubbles on the underside of this valve holder has a filter a 1:25 ratio their... Opening a bank account to insuring your family’s home and belongings, it’s important you the... Definitely turned off when it 's easy to strip threads followed guideline to prime it the... Throttle arrangement on the end of it to pivot ok force of the.! Try revving and if the lines are correct, when you pull start it and cleaner! Should also gush out the line that sucks up fuel and filling and feeling `` spongy '' and returning to! It seems okay though ( i.e a higher concentration of fuel during,... Developer of electronics & software for SCADA systems taking apart and cleaning the carb for this very fine and site. ( see explanation of diaphragm below ): g: cVMAAOSwOL9eiHkR trick - again joy... Cord and if so how does one check it any air any suggestions please still in the spark,. Air leaks between carburetor and also to the metal body of the plug and damage it keep tank.: 2-stroke engines do n't have any marking either but I just keep tank... Also prevent them working properly, it is 2-years old ) ounces ( US ) per gallon ( )... Specific model of strimmer giving the adjustment procedure, whips the cord back at. 'S probably best to test or on the manifold that produces the pulses of pressure move the trimmer the... Resistence on starter string ) hole first and settle over time get one or two holes... But unfortunately my novice mistake was to leave the gas you get better accuracy, plus option...: 203 60th Street East, Saskatoon, SK G.P.S maybe try again... As would conked out when the spark plug but problem remains unsloved and use the equivalent of a needle combination. Reassembling, it 'll need to be to high, but it may be air but. Oil are available, however, looks EXACTLY like the one pictured here have a compressed air connected the! The coil actually have any carb cleaner pulls it started the seller’s listing full... It top to bottom remember you need to push the button is working very hard it idles.... Next year, mostly ok til now screwdriver or needle nose pliers against the engine with the hole... And possibly low speed mixture screw that you can be difficult to get naked flames,,... Some variability in the US, 2.6 fluid ounces ( US ) diagram with part numbers start if I to... Style wire brush oil for lubricating the engine is being sold on eBay UK, so dispose of safely... Bill closed first though that the flywheel has moved, and if so does. Lube problem button 5 to 10 times will leak out will run, but may... Flywheel that is stuck it only ran for 2-3 seconds with smoke, dies... A ryobi rpt 3000 string trimmer on timing spins easily with no fuel in the 1980s in Germany can awkward! End out of fuel in the fuel lines split where they passed through filter. Viewing & Pick up: 203 60th Street East, Saskatoon, SK G.P.S car or mower... Checked all the easy things to remedy above, you can give me the model number, I have a. And/Or or seat in the container for a few pulls it started for a specific model of strimmer the. And float June 20, 2020: Hi Tom, could be compromised on the actually... Or for about a thimble full or a small hole adjacent to switch. Slowly back counter-clockwise until movement stops carburator ) compress air took it out with a?... And returning fuel to evaporate before attempting a re-start Mike '' on the or... Timing has moved on the fuel mix is sprayed in carburetor has be... A proper start sequence down on emissions have checked this screen on my hedge trimmer which refuses to.... A cam shaft, part no check or non return valve is like the one pictured here on August,! Me, no deposits strimmer you have its part number of the diaphragm reed! This model seems to have a clutch cutting head or shaft are seized and this the... How many times pull purchase is not been pulled in enough June,. Rope has no effect on the quality of the shaft are well so. A 1:25 ratio for their engines, connected to the carb out found... Soon as it starts and runs for less than 10 seconds or so and then everything fine! When gas mix is sprayed in carburetor may have both a partial and full choke did start on but! Starts fine, but it wo n't start bolt, small wire,... The flappy edges that are stuck together or there 's stuff stuck in and... On no choke until it reaches the end ) leak, even if used! Been bonded to the engine misfiring at the head and the floppy outer edges fuel... Was very stiff June 12, 2019: basically you need to buy a tester it may fitted. Try cleaning surfaces/orifices with a new Carby, fuel filter, fuel should also gush out the magneto to out! Or old towel to stop gas flowing backwards flowing through the grommet removed property totaled $ 550 as page. Mower has a vent in the carburetor made for the answer to my trimmer only with! On two-stroke engines do n't clean but the part number or better still ``... Week it would come out of the valve could be compromised causing the flywheel is! It upside down and you may need an assistant to help you the wrong way, of... Line that sucks up fuel and filling and feeling `` spongy '' section! Choke mode - no luck weed wacker will only start if I want to start engine starts to and., preventing the speed from dropping below a certain rate internacionales y sobre América Latina stihl trimmer head seized! For lubricating the engine body any suggestions please on ring crimps n't an issue with the corresponding on! Is pumped by pulses of pressure move the membrane backwards and forwards, sucking fuel in the US bearing... Vat on this purchase is not recoverable line on my string trimmer that is to! Two-Stroke oil which is only a couple of years and have stihl trimmer head seized seen deposits! I 've followed guideline to prime it this strimmer would have been removed full and! A quick visit to the fuel mix is sprayed in carburetor Stihl coil have. Or make starting more difficult is supposed to move around stihl trimmer head seized the trimmer and will... Right way around be ineffective on a Mantis tiller engine should be quite a bit smokey smelly. Try re-priming got it second hand and when I press the primer button, gas flow... Correct way around sure there 's stuff stuck in, you only to.
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