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Ryobi 31cc lawn trimmer carb adjustment

I adjusted the air mixtures screws to try and get my trimmer to run better and now it won't start. what is a good starting pooint for the air mixture screws? high and low "I know what a goob"

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  • Anonymous Feb 22, 2009

    Ryobi RST131ES trimmer will only run in the half choke position. Have replaced the diaphram and flapper valves, and all the fuel lines, blown out the carb. body and checked the needle valve.

  • lilaabner191 May 11, 2010

    how can i adjust my string edger carb. when there is no high speed adjustment, only a solid post where the screw should be. it is a homelite 17 inch trimmer

  • lilaabner191 May 11, 2010

    how can i adjust my string edger carb. when there is no high speed adjustment, only a solid post where the screw should be

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As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)

Posted on Nov 24, 2008

  • Dave Nov 24, 2008

    PS this was copied from another site but .. i tried the procedure to fix my own ryobi line trimmer ..

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I have a ryobi 31cc trimmer. problem started with a primer bulb that would depress but not reset, removed the primer and all was working well. turns out that the primer feeds to the carb fine. but flow stops at the diaphram. a dribble of gas will eventually enter the carb, and the trimmer will run for about 3 seconds. what now?
kirk

Posted on Aug 23, 2009

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My not fireing??

Posted on Mar 12, 2009

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