Hi
there are no adjustment screws
it is set up as solid state
what happens with these diaphragm carbs is
if there is any fuel left in the tool when stored
the fuel expands and shrinks in cold weather
and stretches the diaphragm
making the machine useless
if it was the older machine i have a carb kit for it
but as your machine is still sort of new
there is no carb kit for it
here is a link to the carb you need https://www.ebay.co.uk/itm/321780497527
Yea there is a air fuel mix screw on my s430 I’m trying to get it set right
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SOURCE: need carb settings on both screws on Ryobi C430
start with both screws about 1 and a half turns out from fully screwed in. The high screw will set your fuel for wide open. Back it out until you hear the motor run almost wild then screw it back in about a half a turn. The low screw is a little trickier. When you can quickly go to full throttle from idle its about right.
there's usually just a screw you have to sort of play around with until you find the right combination
SOURCE: ADJUST AIR FUEL MIX ON A RYOBI C430 TRIMMER
open the muffler and clean the screen inside of it
Hi peter beaufoy...
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud
SOURCE: Ryobi weedeater carb fuel mixture screw cap removal and carb adjustments
probably doesn't have a cap but will need special screw driver to make the adjustments
you can bet then from any mower repair shop
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