Paul you might want to replace the spark plug, make sure the gap on the plug is correct, make sure there is oil in the machine, some have a safety switch when the oil is low. If you cant buy a new spark plug you can sand off the tip that is probably black and replace it in the machine
SOURCE: Ryobi string trimmer 32.1 what do mix gas and oil or just gas?
Ryobi trimmers I have had use a 32:1 oil mix. Just pick up a little bottle of Ryobi 2-cycle oil and read it to see that it will give a 32:1 mix in a gallon of gas. Pour it into a gallon of gas, and maybe a little fuel stabilizer too, shake it up and you should be good for the season.
SOURCE: weed wacker
check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. if that doesn't work have the carb repaired at a service center or replaced.
SOURCE: How to change the string
If it is a duel line trimmer then:
Cut two separate pieces of string, about 7 ft. each.
Stick the end of
the line in the hole on the inside of spool.
Wind clockwise onto spool,
putting the line that is closest to the ground on first.
Once you have
winded this piece on, lock the last 4 inches of line through the slits
on spool.
Repeat process for second piece of line, locking the last 4
inches in slot opposite the other locked in piece.
Put the spool on the
trimmer, feeding the end of lines through either hole on trimmer.
Before you push the spool all the way on, pull the strings out of the
locked position.
If it is a single line trimmer, just wind a single piece of string clockwise onto spool.
Jim
SOURCE: How do I restring my Ryobi weed wacker
Start in the center ,snap the center in place. than put the ends out through the holes.
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