Hi - I got a new ryobi linetrimmer/brushcutter RBC30PHT last summer , only used it a couple of hours before the winter. Now when I open the throttle fully it goes slow and splutters. If I open the throttle slowly it will accelerate and pick up slowly. Any suggestions ? Thanks, David

SOURCE: ryobi 4stroke brush cutter, fading on full throttle

This running pattern often indicates a lean fuel mix.

Unfortunately, with today's environmental hysteria, you probably will not be able to adjust the carburetor enough to get it to run better. If you do have any carburetor adjustment available, try turning the screw (the high speed screw, if there are two) counter-clockwise a bit. This will allow more gas into the mixture. Most small engines today have limiter caps that prevent very much carburetor adjustment.

SOURCE: carb replaced last may was still undr warranty

If you had stored it with fuel in it, then the fuel has gone bad. That will cause it to not start. Today's fuel with ethanol is murder on small engines when stored with this fuel in it without stabilizer. This is not a design problem, it is a government problem with the mandating of ethanol added to the gas. This is a problem for ALL small engines. It is very common, and you are probably going to have to clean the carburetor, replace the diaphrams, replace fuel lines and fuel filter, and the primer bulb.

I hope this helps you get running again.