Question about Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer

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Ryobi 3043 Strimmer won't idle after strip-down.

My Ryobi PLT-3043YE strimmer will not idle and needs 1/2 throttle to keep running.
This was not the original problem - yesterday it would not reach full speed after 10 minutes use, but idled OK, and eventually would only reach 1/3 of normal revs on full throttle. I pulled the carb and removed the bottom cover - it was immaculate inside and the float & diaphragm seemed fine so I refitted it. Then I checked the spark arrester, which was completely clogged with carbon - so I cleaned and reassembled it. Now it runs fine at full throttle but stalls on less than half throttle.
I suspect that the idle jet/passages got a bit of dirt in when I took the bottom off the carb. I've twice tried blowing it out - no effect. Looking for ideas!

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  • Gnomeface May 18, 2009

    Josh1111 - the carb screws have "tamper-proof" plastic covers that only allow the mixture to be weakened, by 1/4 turn. I tried altering them as far as possible (no effect) then reset them to the original positions. The trimmer idled fine before I opened the float chamber briefly (and it isn't very old) so shouldn't need adjustment - and as it needs almost 1/2 throttle to keep it running I'm thinking that it must be more then a simple adjustment issue. I'm considering of cutting off the anti-tamper covers, removing the idle screw completely, then either blowing through with compressed air or using a fine brush bristle to poke through the airways.

  • Gnomeface May 18, 2009

    OK, it's fixed. I found out how to remove the anti-tamper guards from the adjusting screws and removed the screws, blew through and used a brush bristle to check the tiny holes were clear, and reassembled. It started OK and after adjusting the screws it runs better then ever. Seems I'll have to clean the spark arrester every year though.

  • Gnomeface May 18, 2009

    OK, it's fixed. I found out how to remove the anti-tamper guards from the adjusting screws and removed the screws, blew through and used a brush bristle to check the tiny holes were clear, and reassembled. It started OK and after adjusting the screws it runs better then ever. Seems I'll have to clean the spark arrester every year though.

  • ascpipo May 21, 2009

    I have the same problem with my Ryobi 3043. Can you explain where the spark arrester and idle screws are located?

  • josh1111 May 11, 2010

    did you adjust the carb screws correctly?



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Posted on Jan 02, 2017

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SOURCE: RLT30HT 30CC PETROL STRIMMER difficult to start

The plug that I have in my 720r is a Champion RDJ7Y. Can I suggest that you pull the old plug out and look to see which one you have? Also when you buy the new replacement it should already be gapped for what you need.
Good luck!

Posted on Jul 28, 2009

  • 9 Answers

SOURCE: Have the RLT30HT strimmer. Hard

Something is causing a lean mixture (less fuel) at the carb. Usually a furl flow problem - do the easy things first - check fuel tank foe any leaks (cracks in plastic) fuel lines for being dark yellow or brown colored - they will begin splitting apart at this point. Then go after the fuel primer bulb - if darkened then replace it - about $4 at hardware stores. Then take a look at the muffler - there will be a spark arresting screen at its outlet - remove the exhaust snout and lose the screen - doesn't run with that screen plugged up!! Now start it back up and you might just be surprised!

If it still does not run well unless you partially choke it, turn the fuel mixture screw a quarter turn outward to admit more fuel into the carburetor. Do this until the RPM increases - careful not to go too rich - can foul out the plug! Find the sweet spot. Hope this helps you.

Posted on Jun 21, 2011

  • 6 Answers

SOURCE: My Ryobi strimmer will not start. It has never

You need to have someone clean the carburetor.

Posted on Jun 28, 2011

  • 776 Answers

SOURCE: ryobi RY09440 4 cycle blow will run great for 10

You choke lever may be stuck (or the choke plate is stuch on the carburetor).

Posted on Sep 24, 2011

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