RYOBI MODEL NUMBER PBC 3046YB 30cc
You have to adjust the H needle on the carburetor. Quarter turns, when adjusting the high, the H needle, you have to hold the trigger in, throttle high... if it bogs, turn the h a little at a time and depress the trigger slowly until u hear the sweet spot...very simple fix.
SOURCE: cant get my ryobi pbc-3046ye brushcutter to start,
probley got a pin hole in one of plastic tubes
SOURCE: Ryobi PBC 3046YE strimmer starts but cuts out when speed control
A lack of acceleration in these units is most likely a fuel delivery related issue. It may possibly be time for a diaghram kit or carb rebuild kit to be installed in your carburetor. Ethanol in the gas deteriorates the parts that accomplish the acceleration procedure and may need to be replaced as they don't function anymore.
Many other things can affect these little machines as well such as clogged air filters, clogged crank case vent, clogged mufflers/exhaust ports./ spark arrestor screens...but more often than not, your problem is a carburetor issue.
Please look at the troubleshooting section on this Zama site PDF file
http://zamacarb.com/pdfs/TechGuide_2007.pdf
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