I figured id add that when the choke is on it creates a vacuum throughout the whole carb and actually draws more gas and less air. It means your engine is no longer able to suck enough gas thtough the lines because of blockage. Check the fuel diaphrams in the carb! Great video thanks for the help!
The screw you're adjusting in this video is the high-speed jet. You can adjust it as you have shown, or a much more conventional method can be used, which is: 1. Start the engine, allow to warm to operating temp. 2. Pull throttle to high speed and hold, adjust the high-speed jet screw in/out to obtain the highest speed with as little vibration as possible. (That's it for the high-speed jet.) In 99% of cases the low speed jet never needs tampering with, and improper setting can cause several other bad conditions. However, if you're ABSOLUTELY SURE you must change the low-speed jet setting, for most carburetors the jet is on the top of the carburetor covered by a polymer cap. Remove the cap, start the engine and allow to run at idle (about 3000 rpm), then SLOWLY adjust the low speed jet in/out until the smoothest operation is reached at the highest speed. Then reset the idle speed setting for running at about 3000 rpm. Re-install the polymer cap. Either of these adjustments can easily be performed in 30 seconds or less.
It's been my experience that the L and H jets have nothing to do with this issue! Usually there is a chunk of crap stuck in the inlet side screen. Or if it is a 4cycle engine it's got crap stuck in the main jet and requires you to remove the fuel bowl and poke the end of a small spring in the hole in the jet. 😉
Thanks for the video it helps me getting my weed eater back after being bogging in full throttle. When searching I only find video explaining engines with 2 adjusting screws, this the first I found explaining engines with just a single caprator adjusting screws. Now I get my engine back to work 😀😀 thanks...
Just did a stihl fc?110 bush cutter with these symptoms so l took the carb appart assuming blockage not enough fuel. Did that twice to make sure l put carb back correctly...( pot is legal in Canada). Felt rather frustated, checked a few more UTube vids, l started to hear the words " plugged spark arrestor" over+ over, sure enough that was the bulk of the problem. My early inspection will now include a look at the spark arrestor screen... Enjoyed your video! Nice job! Thanks Perry
Awesome video, fixed mine in less than 5 minutes. Mine does not have regular screw heads, just a round stub with a notch in it. I used a flat head to turn it using the notch
Thanks for your helpful content. I followed your recommendations however they didn't work, only to discover 2 things: 1. The Choke on my engine was incorrectly labelled i.e. in reverse 2. The throttle cable was too short causing it to flood on restart Thanks again and I hope that this may also help others.
Hi l have a Makita EM2600L had very little use It will start and run with choke tick over without but, will not rev up just cuts out l have cleaned the carb 3 times still won't run properly. There are no mixture adjusting screws any ideas. Cheers Andy
Not sure if you’ve heard this before, but you look like golem from LOTR movies.. but with facial hair.. no disrespect meant .. I like the video, made a lot of sense..
if you are lucky like me and have the right brand carburetor. this info might help you there should have the L screw on the top on the throttle cable part, probably covered by silicone cap or plastic just peel it off and find the L screw
Well put together vid mate learned alot. Essentially im a bit stuck with what the answer would be for myself and my 49cc small engine pulls nice, chugs well but doesnt fire and start up going to check the spark sleeve as it wasn’t the most secure. Plugs fine, has fuel and 2 stroke
I've got and SGS 5 in 1 hardly used because its a pig to start. The main issue is that the compression is high and it kicks back whacking my knuckles. There is no problem with fuel flow. I decided to fit a new plug as it was black and sooty. It doesn't start easily on choke and I wondered if more air in would weaken the mix and reduce the compression. What do you think?
Good day i have a Murray M43x wead eater name off the carburetor walbro. The engine starts when the lever is up but when i but it down all the way the engine revs up can you help me?
Mine was running great before winter. I put sta-Bil in plus ethanol treatment like I do every year. Never problem till now. I think jet may be gummed up ? Comments
Have a challenge extreme strimmer having trouble tuning machine bought a new carb as screws snapped on old one it's really struggling to run choke off half choke it revs but then bogs have the air mixture screw and since iv screwed the throttle screw out it will rin on choke if I go too far it cuts out if tried turning half a turn will rev on half choke but on run it's just boggy any ideas great vid new sub cheers
so basically it should run on the 'run' position. i have a 4 stroke hawkvision. i had a hard a time wrapping my head around this untill i watched your video
Engine runs only on chock and screw doesn't effect it in any way less it's fully in not matter how far out I go it's dying when chock clicked off and it's brand new
I have a very similar trimmer and it has on/off on the choke lever. Should the lever be in on(lower) position when startin the trimmer or in off(upper) position when starting it? I noticed the trimmer shuts down when I press the throttle while choke is in off position. So does that mean off(upper position) means choke engaged and on(lower position) means choke disengaged? My thoughts are off means choke disengaged and that trimmer should work when choke is in off position but it seems I am wrong with that.
Hi, I have a similar problem. It starts easily with the choke and has a stable low speed run. Wen i open up the throttle it dies. I tried to adjust the screw and went trough every possible setting and it sill dies. I have the same engine that you shown in your video.
I can get my Chinese made Strummer to start on choke but as soon as I so much touch the choke knob to put it to run the motor surges really high and dies out. Can't get it to start at all in the run position. It's is a barrel type cube carb with the idle screw in the center of the throttle knob and the high adjuster on the backside of the carb. Do help if I have been able to present my predicament clearly.
Hi mate, bizarrely, mine won’t run with choke on. But when not on runs ok….but smells very rich. I have a ferrex. Is that normal to smell rich or is something sound wrong? Sorry if this is a little vague. Cheers
slighty off topic about choke,but i have an older model sgs strimmer and the problem im having is it will not run once warmed up. ive tried adjusting the fuel mix cleaning filters and most other things and still cant get it to run.i have noticed one thing, and that is it smells very rich on the mixture no matter what i adjust on the screw.also it will run fine for a few seconds when i pull off the fuel feed but as soon as i reconnect the pipe it bogs down then stops. any ideas because up untill this point it was a great little strimmer
I have a Parkside strimmer, when I pulled the string to start it, it slapped back and broke off the red choke for regulating it. So, what to do with it now. ?
So the choke leaver is snapped off? You can buy new leavers. But I’d be tempted to just try to stick something to the remaining bit. Is there anything left of it or is it completely gone?
The "twisty-turny" thing didn't help me (or my engine). I did some ethnic engineering by putting a screw in the little shelf above the choke lever to restrict it from opening completely. Works well now. BTW, the choke lever works in the opposite direction on my engine. I haven't given up yet, next step will be to take the carb apart and verify there are no restrictions in the main circuit.
My strimmer is starting but cutting out, it runs for a few seconds by moving the choke up and down then dies out. Can anyone help? It's the same model in the video.
can you send me one of those t-shirts - love it I have a four stroke 7hp and it will not start it just backfires ( it's a new motor ) it worked good once and now it's F$@ked any ideas what it may be? (i need help with this shit )
Please help I bought a brand new brush cutter 52cc 2stroke and I fiddled the whole day with the air fuel butterfly valve screw and as I put the choke off the engine dies? What else can I do I even added more oil (as it's never ran before)
If you bought it new then it shouldn’t need any adjustment. You can try setting the screw back, if you adjusted the butterfly then that’s the Tickover screw. You can start it up and turn that screw in until it stays running :)
@@RSPYT okay thank you sir I managed to find the L and H screw and got the air fuel mixture just right praise God everything is running well I started a mini Removal and garden service business 🙏🏻
Is it normal for a trimmer to start with the choke on..? Mine says to pull the string a few times with the choke on, then remove the choke and pull the string again, but mine starts running as soon as I start pulling the string with the choke on. It also starts at full throttle, I have to press the throttle a bit and then the revs drop to idle.
I have a question please, when I put the choke on to start from cold should the port behind the air filter be closed off or open? I have a sgs strimmer as in your video which starts ok but will not run when I turn the choke to the off position which closes the port off.
hey man I like your Music and your straight to the point of my question so I subscribed to your channel. I like that accent as well sort of sound like the GEICO green lizard on their commercials. One more thing you do need to tell all us rookies which one is the low screw? Fred
Air pressure can effect it, damp air if it’s a foggy day or something. Or if it’s a very dry hot day it’ll need Richening. Or the quality of the petrol and oil you’re using can effect how it runs and starts
Hi, My strimmer is the HYBC5200x with a pull choke, the manual does not say how to turn the choke off just says to the off position . no off possition is marked on it, anyone got any idea as i dont want to force it :)