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2 Cycle Full Crank Straight Shaft String Trimmer

Model: #RY253SS | Home Depot Sku #: 1001059129

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Introducing the RYOBI 2 Cycle Gas Straight Shaft String Trimmer with a full crank engine for 2X longer life. This string trimmer accepts RYOBI Expand-It Universal Brand Fit attachments adding versatility to your trimmer. Simply attach an Edger, a blower, or even a tiller to the power head and quickly move from project to project. Save time, save space and save money with the RYOBI Expand-It System. RYOBI makes string head reloads easier with the Reel-Easy String Head; thread your string, twist the head, and resume trimming. Users will experience easier starting with the Zip Start carburetor and included Ethanol Shield 2 Cycle Oil. Backed by a 3 year warranty, trust the RYOBI 2 Cycle Gas Straight Shaft String Trimmer for your outdoor trimming needs.


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Full crank engine for 2X longer life

Attachment capable: accepts universal brand fit attachments

Zip start carburetor for easier starting

Reel-Easy bump-feed string head for faster reloads

Dual 0.095 in. line

Straight shaft for extended reach around and under obstacles

Ethanol shield 2-Cycle oil included

  • Power Head
  • Straight Shaft Trimmer
  • REEL-Easy String Head
  • 2 Cycle Ethanol Shield Oil

What is the best way to cut weeds and grass using my string trimmer?

  • Keep your string trimmer tilted toward the area being cut
  • Pass the unit from left to right (if using a curved shaft string trimmer) and from right to left (if using a straight shaft string trimmer). By following these directional cutting paths, you will avoid having debris and grass clippings from being directed back at yourself.
  • Use the top of the line to do the cutting. Do not force the string head into uncut grass; this could cause the trimmer to bog down.
  • Avoid trees, shrubs wire and picket fences.

How do I advance the line on my REEL-EASY™ String Head?

Line advance is controlled by tapping the string trimmer head on grass while running engine at full throttle

  • Run the engine at full throttle
  • Tap the knob on ground to advance line. The line advances each time the knob is tapped. Do not hold the knob on the ground

NOTE: The line trimming cut-off blade on the grass deflector will cut the line to the correct length

NOTE: If the line is worn too short, you may not be able to advance the string by tapping it on the ground. If so, stop the engine and manually advance the line.

How do I manually advance the line on my REEL-EASY™ String Head?

  • Stop the engine and disconnect the spark plug wire to ensure you will not be harmed
  • Push the knob in while pulling on line(s) to manually advance the line

How do I replace the line on my REEL-EASY™ String Head?

  • Stop the engine and disconnect the spark plug wire to ensure you will be safe while replacing the line.
  • Rotate the spool clockwise as necessary to align the arrows on the spool.
  • Cut one piece of trimmer line at approx. 20ft. in length. Insert the line in the eyelet on the string trimmer housing. Push until the end of the line comes out the opposite side of the string head. Pull the line from the other side until equal amounts of line are on both sides of the spool.
  • Rotate the spool clockwise to wind the line on the spool until approx. 6 in. of line is showing on each side.
  • Push the spool retainer down while pulling on line(s) to manually advance line and to check for proper assembly of the on the string head.

How should I store my 2 Cycle Gas String Trimmer?

  • Clean all foreign material from the product. Store idle unit in a garage or shed in a dry, well-ventilated area that is inaccessible to children. Keep away from corrosive agents such as garden chemicals and de-icing salts. Abide by all local regulations for the safe store and handling of gasoline

When storing 1 month or longer:

  • Drain all fuel from string trimmer tank into a container approved for gasoline. Run engine until it stops

What is the correct fuel mixture to use with my 2 cycle engine RYOBI Outdoor Product?

Your 2-cycle engine requires pre-mixing gasoline and 2-cycle lubricant. Pre-mix unleaded gasoline and 2-cycle engine lubricant in a clean gas container. DO NOT mix quantities larger than usable in a 30-day period. Do not use automotive lubricant or 2-cycle outboard lubricant. We recommend using a RYOBI/Homelite premium 2-cycle oil or a PowerCare 2-cycle oil.

Filling your tank:

  • Clean surface around fuel cap to prevent contamination
  • Loosen fuel cap slowly. Rest the cap on a clean surface.
  • Carefully pour fuel into the tank. Avoid spillage.
  • Prior to replacing the fuel cap, clean around the gasket.
  • Immediately replace fuel cap and hand tighten. Wipe up any fuel spillage

Note: it is normal for smoke to be emitted from a new engine after fist use.

How do I start my RYOBI 2 Cycle String Trimmer?

To start a cold engine:

  • Slowly press the primer bulb 10 times.
  • Set the choke lever to the START (A) position.
  • Squeeze the throttle trigger fully and pull the starter handle until the engine runs. Do not pull the start grim more than six (6) times.

NOTE: Keep the throttle trigger squeezed fully through remaining steps. If the engine does not start, start over at the first step with pressing the primer bulb.

  • Allow the engine to run for 10 second, then set the choke lever to the RUN (B) position.

To start a warm engine:

Slowly press the primer bulb 10 times.

Set the choke lever to the RUN (B) position.

Squeeze the throttle trigger fully and pull the starter handle until the engine runs.

How do I stop my RYOBI Gas String Trimmer?

To stop the engine, depress the STOP switch to the stop position

How do I remove the attachment from my RYOBI Power Head?

  • Stop the engine and disconnect the spark plug (if a gas unit), remove the battery (if using RYOBI 40V Power Head)
  • Loosen the knob at the connection point
  • Push in the button and twist the shafts to remove and separate the Power Head from the Attachment

How do I install my attachment to my RYOBI Power Head?

  • Stop the engine and disconnect the spark plug (if using a RYOBI Gas Power Head); remove the battery (if using the RYOBI 40V Power Head).
  • Loosen the knob on the coupler of the power head shaft and remove the end cap from the attachment (black rubber piece with loop hole for hanging).
  • Push in the silver button located on the attachment shaft. Align the button with the guide recess on the Power Head coupler and slide the two shafts together. Rotate the attachment shaft until the button locks into the positioning hole.

NOTE: If the button does not release completely in the positioning hole, the shafts are not locked into place. Slightly rotate from side to side until the button is locked into place.

  • Tighten the knob securely.

How do I attach the front handle to my RYOBI Gas String Trimmer?

  • Remove the wing nut, washer, and bolt from the front handle.
  • Install the front handle onto the top side of the drive shaft housing in the area indicated by the label.

NOTE: The open side of the handle should face the user

  • Place the bolt through the front handle

NOTE: the hex bolt head fits inside the hex recess molded into one side of the handle.

  • Reinstall the washer and wing nut.
  • Tighten wing nut securely.

How do I attach the grass deflector to my gas string trimmer?

  • Remove hex screw, washer, and wing nut from the grass deflector.
  • Press the grass deflector onto the bottom of the shaft.
  • Insert the hex screw through the grass deflector and the bracket on the shaft.
  • Place the washer on the hex screw.
  • Place the wing nut on the hex screw and tighten securely.

25cc 2-Cycle String Trimmers - Model ry252cs, ry253ss


Ry252cs ry253ss 090333002 090333003 347 trilingual 02
RY252CS_RY253SS_090333002_090333003_347_trilingual_02.pdf
Published: 11-17-2015
Filesize: 5.38 MB


Ry252cs ry253ss 090333002 090333003 181 qsg 02
RY252CS_RY253SS_090333002_090333003_181_QSG_02.pdf
Published: 10-06-2014
Filesize: 752 KB


Ry252cs ry253ss 090333002 090333003 347 trilingual 01
RY252CS_RY253SS_090333002_090333003_347_trilingual_01.pdf
Published: 01-14-2015
Filesize: 5.26 MB


Ry252cs ry253ss 090333002 090333003 348 qsg trilingual 01
RY252CS_RY253SS_090333002_090333003_348_QSG_trilingual_01.pdf
Published: 01-14-2015
Filesize: 935 KB


Reel-Easy String Head - Model ac04156


Ac04156 000997048 139 trilingual 03
AC04156_000997048_139_trilingual_03.pdf
Published: 10-31-2017
Filesize: 5.61 MB


Click the link below to access outdoor products replacement parts schematics and order parts online.

For those customers that prefer ordering by phone, simply contact the Ryobi master parts distributor at toll free 1-877-545-4110, and place your order over the phone.

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