Question about Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer

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I HAVE A MODEL775R RYOBI GAS TRIMMER 31CC IT HAS NO SPARK.

COULD IT BE THE ON AND OFF SWITCH OR THE MODULE. I ALSO HAVE A PROBLEM WITH NO SPARK ON MY MACHINE. IT RAN FINE THIS SPRING (EVEN WITH LAST YEARS FUEL) THEN JUST QUIT. I REPLACED THE PLUG AND IT RAN FOR A FEW MINUTES THEN QUIT. I PUT A NEW PLUG IN AND FRESH GAS, TOOK OFF THE PLASTIC COVER TO MAKE SURE THE SWITCH WAS NOT GROUNDED OUT AND STILL NO SPARK. ANY IDEAS ON HOW TO TROUBLE SHOOT?

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  • 37 Answers

You probably made the mistake of leaving it in the shed over winter with gas in it.
in the carb there is a diaphgram that oumps this fuel in via the motor vibrations.
said diaphgram had been ruptured due to drying gas in the carb. the solver to this is to either have a small engine mechanic replace it or the whole carb or get a new one, and i would suggest you get the cs26 model instead. i have a cs30 and cs26 and i have had less problems with 26. it only has two chokes.
you prime it.
you push lever to start, closing all but a little bit of carb,giving engine much richer mixture.
you squeeze trigger, opens halfway/full, as there are two chokers in the carb, on controlled by lever and another by throttle.basically now you haave half choke.
you release trigger, goes back to 7/8 choke to keep at idle but not running. your ready to go.
on the cs30 its much more complicated:
ful choke
prime 7x.
pull 4x
half choke
pull till start.
wait ten seconds of running at idle rotate to run
good to go. but these guys have porr design. if you take off the back cover and look above fuel tank on cs30, the crank is RIGHT SMACK THERE and not better secured like in the '26 model.
that's what the little circular hole is in it.
anywho, the diaphgram is ruptured, and you probably haven't noticed that in addition you have gas leaking out the carb's air intake.

Posted on Jun 01, 2009

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