Model #720R Ryobi line trimmers/weedwackers, gas

  • Engine
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  • Boom And Trimmer
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Question and Answers

Q:

On a Ryobi 720r string trimmer, what gap is required for the spark plug? It is not in the Manual!

A:

The gap on the spark plug for your trimmer should be .030.

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Jimmy K -
Sears Technician
May 29, 2009
Q:

What are the two screws called on the top of the carb of a 720r Ryobi weed eater?

A:

I assume you are referring to the high and low speed mixture adjustment screws for the engine.

Begin by turning each screw clockwise and count the turns it takes to make them bottom out. Remove and clean the needles and clean the openings the screws screw into.

Put both screws into the carburetor and turn them in until they bottom out. Back both screws out 1 1/2 turns. The engine should start and run at this setting.

With the engine running turn each screw in until the engine runs rough. Back the screw out until the engine smooths out then runs rough again. Turn each screw in until the engine runs smoothly.

I hope this helps.

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Jimmy K -
Sears Technician
April 16, 2010