Start Right Here Find appliance parts, lawn & garden equipment parts, heating & cooling parts and more from the top brands in the industry here. Click on Shop Parts, or select the kind of product you're working with on the left and we'll help you find the right part. Ryobi String Trimmer Repair Help. Search Help by Model. Need help finding your model number? Most Common Problems. String trimmer won't start. 10 possible causes and potential solutions. String trimmer starts then stalls. 5 possible causes and potential solutions. Ryobi S430 RY34441 Manuals & User Guides. User Manuals, Guides and Specifications for your Ryobi S430 RY34441 Trimmer. Database contains 1 Ryobi S430 RY34441 Manuals (available for free online viewing or downloading in PDF): Operator's manual. Common solutions for: Ryobi String trimmer starts then stalls. 01 - Spark Arrestor. The spark arrestor is a small screen that prevents the engine from emitting sparks. Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the engine may stall. To unclog the spark arrestor, remove it and clean it with a.

Ryobi s430 carburetor diagram

9 — English



Always shut off engine before fueling. Never add fuel to
a machine with a running or hot engine. Move at least
30 ft. from refueling site before starting engine. Do not
smoke and stay away from open flames and sparks.
Failure to safely handle fuel could result in serious per-
sonal injury.


Fuel system damage or performance problems re-
sulting from the use of an oxygenated fuel containing more
than the percentages of oxygenates stated below

are not


covered under warranty.
. Gasoline containing up to 10% ethanol by volume
(commonly referred to as E10) or 15% ethanol by volume
(commonly referred to as E15) are acceptable.

E85 is not.


Attempting to start the engine before it has been properly
filled with lubricant will result in equipment failure.


See Figure 8.
Engine lubricant has a major influence on engine perfor-
mance and service life. This unit is shipped with a 20W50
engine lubricant to assist in the break-in period. For best
operating performance, continuing to use 20W50 engine
lubricant is recommended, however, SAE 30, 10W30, or
10W40 are all acceptable lubricants to use in this product.
Always use a 4-stroke engine lubricant that meets or exceeds
the requirements for API service classification SJ. Check
lubricant level before each use.
NOTE: Non-detergent or 2-stroke engine lubricants will
damage the engine and should not be used.
To add engine lubricant:

Remove the cap and seal from lubricant bottle pro-


Unscrew the oil cap/dipstick and remove.

Using funnel provided, add entire bottle of engine lubricant

through oil fill hole.

Reinstall the oil cap/dipstick and secure.

To check engine lubricant level:

Set unit on a flat surface.

Wipe dipstick clean and re-seat in hole; do not rethread.

Remove dipstick again and check lubricant level. Lubricant

level should fall within the hatched area on the dipstick.

If level is low, add engine lubricant until the fluid level rises

to the upper portion of the hatched area on the dipstick.

Ryobi S430

Replace and secure the oil cap/dipstick.


Do not overfill. Overfilling the crankcase may cause
excessive smoke, oil loss, and engine damage.


See Figure 9.


Engine housing may become hot during trimmer opera-
tion. Do not rest or place your arm, hand, or any body
part against the engine housing during trimmer operation.
Only hold the trimmer as shown in Figure 9 with all body
parts clear of engine housing. Extended contact with the
engine housing may result in burns or other injuries.

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Ryobi S430 Manual

Always position the unit on the operator’s right side. The
use of the unit on the operator’s left side will expose
the user to hot surfaces and can result in possible burn

Ryobi S430 Price


Ryobi S430

To avoid burns from hot surfaces, never operate unit with
the bottom of the engine above waist level.

Hold the trimmer with your right hand on the rear handle
and your left hand on the front handle. Keep a firm grip with
both hands while in operation. Trimmer should be held at a
comfortable position with the rear handle about hip height.
Cut tall grass from the top down. This will prevent grass from
wrapping around the shaft housing and string head which
could cause damage from overheating. If grass becomes
wrapped around the string head, STOP THE ENGINE, dis-
connect the spark plug wire, and remove the grass.


Always hold the string trimmer away from the body keep-
ing clearance between the body and the product. Any
contact with the housing or string trimmer cutting head can
result in burns and/or other serious personal injury.

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Ryobi Parts Lookup by Equipment Type

Need help finding your Ryobi model number?

Your Ryobi equipment has a factory model number and serial number on a sticker-like label or metallic tag attached to the unit in a place away from moving parts (usually near the handle, under the seat, or on the side of the unit). The best way to buy repair parts for your Ryobi is to begin by searching for your Ryobi model number on PartsTree and use the OEM Ryobi parts diagrams to find the parts that fit exactly like the originals from the Ryobi factory. When you locate your Ryobi model tag, take a picture for future repair parts needs.

What do Ryobi model tags look like?

Note: To buy engine parts for your Ryobi, like an air filter, oil filter, fuel filter, spark plug, tune-up kit, or carburetor parts, you will likely need to search separately on PartsTree for your engine model. On Ryobi equipment, the engine model and specification ('spec') numbers, as well as serial number and sometimes type and code, are often stamped above the muffler, by the spark plug, or near the overhead valve cover.