Ryobi 700R trimmer Parts

For the Ryobi 700R gas line trimmer, we use a 32:1 fuel mix: unleaded gasoline plus 2-cycle engine oil. Mix the fuel in a separate approved fuel can (not in the trimmer’s tank) to help prevent hard starting, stalling, and engine damage; see the owner's manual for the exact mixing table.

Correct 32:1 mixing amounts

Use this quick reference for the 700R fuel/oil ratio:

Gasoline amount	2-cycle oil to add	Mix ratio
1 U.S. gallon	4.0 fl oz (118 ml)	32:1
1 liter	30 ml	32:1

How we recommend mixing and fueling

• Use fresh, unleaded gasoline and 2-cycle engine oil.
• Measure oil accurately; too much oil can cause heavy smoke and fouled plugs, too little can damage the engine.
• Pour gas and oil into a separate fuel can, then cap and shake to blend thoroughly.
• Fill the fuel tank with the mixed fuel; wipe up spills before starting.
• Replace old fuel; stale or improperly mixed fuel is a common cause of no-start and poor performance.

If the trimmer runs poorly after fueling

Improper or old fuel is a top cause of “won’t start,” “won’t accelerate,” and “stalls when cutting” on the 700R. Check these items first:

• Confirm you mixed 32:1 (not 40:1 or 50:1)
• Drain the tank and refill with fresh 32:1 mix
• Press the primer bulb 5 to 7 times before starting
• Check and clean the air filter and muffler screen (if equipped)
• Inspect the bump head; if line will not advance, the bump knob can be the issue (see knob asm-bmp 791-153066b)

Why it matters

The 700R is a 2-stroke engine that relies on oil mixed into the gasoline for lubrication. The correct 32:1 ratio reduces plug fouling, improves starting, and helps the engine reach proper cutting power.

Last updated: February 2026

A standard line trimmer can use a brushed motor (common on many corded and battery models), while a brushless line trimmer uses an electronic brushless motor design. Brushless designs typically deliver more torque and runtime with less heat and wear; your Ryobi 700R is a gas trimmer, so it does not use a brushless electric motor. See the owner's manual for safe operation and maintenance details specific to the 700R.

Quick comparison

Feature	Brushed (electric) line trimmer	Brushless (electric) line trimmer	Gas line trimmer (Ryobi 700R)
Power source	Battery or corded	Battery (most common)	Gasoline 2-cycle mix
How it works	Brushes contact a commutator	Electronics drive the motor	Small internal combustion engine
Typical benefits	Lower upfront cost	More torque, longer runtime, less maintenance	Strong cutting power, no battery limits
Typical tradeoffs	More wear, more heat	Higher upfront cost	Fuel mixing, more vibration/noise, more routine maintenance

What “brushless” usually means in real use

• More usable torque under load (thick grass, weeds)
• Better efficiency (often longer runtime per battery charge)
• Less motor wear (no brushes to replace)
• Cooler operation under heavy trimming
• Often lighter motor for the same output

Why it matters for your Ryobi 700R

Even though “brushless” is an electric-motor term, the practical buying decision is still about power and upkeep:

• If you want maximum convenience, electric brushless models reduce routine motor maintenance.
• If you want long sessions without charging, a gas trimmer like the 700R keeps going as long as you have fresh fuel mix.
• For cutting performance, keep the string head in good shape and avoid overextending line; excess line can overheat the clutch (the guard blade trims line to the proper length).

Related maintenance tip (applies directly to the 700R)

A bump-feed head releases line when you tap the head on the ground at higher speed; the guard blade cuts it to the correct length. If your bump feed is worn or not feeding smoothly, replacing the knob assembly can restore normal line advance (see knob asm-bmp 791-153066b).

Last updated: February 2026

On the Ryobi 700R gas line trimmer, 700R is the model number that identifies the exact trimmer design and its correct replacement parts, specifications, and maintenance procedures. It is not a “meaningful” code like an angel number; it is the product identifier used for service and parts matching.

What 700R tells you (and why we use it)

When you use 700R, we can match you to the right information for your trimmer, including the correct operator instructions and specs listed for this model in the owner's manual.

Key ways the model number helps:

• Confirms you are viewing the correct Ryobi line trimmer parts list
• Ensures you order compatible items (for example, bump feed components)
• Ties your trimmer to the correct specifications (engine size, line size, cutting path)
• Helps troubleshoot using the model’s troubleshooting chart and maintenance schedule
• Prevents “looks the same” parts from being installed incorrectly

Model-specific details tied to 700R

For the Ryobi 700R, the operator manual lists these specifications:

Spec (700R)	What it means for you
Engine displacement: 31 cc	Helps when comparing performance and tune-up parts
Fuel/oil ratio: 32:1	Critical for 2-cycle engine life and starting
Cutting path diameter: 15 in	Sets trimming swath and guard expectations
Trimming line diameter: 0.080 in	Guides what line size feeds correctly

Common “parts matching” example

If your bump head is not feeding line correctly, the model number helps you choose the right bump feed components. One example part commonly associated with bump feed operation is the knob asm-bmp 791-153066b.

Why it matters

Using the exact model number 700R is the difference between a repair that fits and works the first time versus a return, poor line feed, vibration, or premature wear from mismatched parts or incorrect setup.

Last updated: February 2026

Yes, you can sometimes run .095-inch trimmer line in a trimmer set up for .080-inch line, but on a Ryobi 700R it commonly feeds worse in the bump head and can overload the clutch if the line ends up too long. For reliable bump-feed performance, we recommend sticking with the line size and length limits listed in the owner's manual.

What changes when you go from .080 to .095

Thicker line increases cutting power, but it also increases drag on the engine and string head.

• Harder on the clutch and can make the engine bog down in heavy grass
• More likely to jam or “not bump” smoothly in the spool
• Can reduce trimming RPM and make the head feel less responsive
• Typically lasts longer per length, but uses more power to spin
• Can make stalling more likely if you try to bump in tall grass

How to try it safely (if you choose to)

If you want to experiment with .095, keep the setup conservative so the head can still auto-trim to the correct length.

1. Load the line neatly and evenly on the reel (overlaps cause feed problems).
2. Start with a short test session in light grass.
3. Bump on bare ground or hard soil at higher speed so the head can release line correctly.
4. Stop immediately if you smell hot clutch, hear abnormal squealing, or the head stops spinning.

Quick comparison

Line size	Best for	Common downside in a .080 head
.080 in	General trimming, lighter weeds	Less durability in thick brush
.095 in	Heavier weeds, thicker stems	More drag; more feed issues; higher clutch heat risk

Why it matters for the Ryobi 700R bump head

Your 700R uses a bump head that releases about 1 inch of line per bump, and the guard blade trims excess line back to the proper length. If thicker line feeds inconsistently or you run the line longer than the guard allows, the clutch can overheat and performance drops quickly.

Related part if your bump feed is acting up

If the head will not bump-feed smoothly even with the correct line, a worn knob can contribute to poor operation. Replacing the knob asm-bmp 791-153066b is a common fix when the bump mechanism is damaged or stripped.

Last updated: February 2026

The most powerful gas string trimmers are professional-grade, higher-displacement straight-shaft models built to hold RPM in thick weeds and brush. Your Ryobi 700R is a capable homeowner trimmer; you get its best power by using the correct fuel mix and keeping airflow and the cutting head in good condition (see the 700R owner's manual).

What “most power” means on a gas trimmer

On a string trimmer, “power” shows up as torque under load and less bogging when the line hits heavy growth. These factors drive it:

• Larger engine displacement (cc) and pro-duty clutch/drive components
• Straight shaft with a gear head (common on pro units)
• Correct 2-cycle fuel mix and fresh fuel
• Clean air filter and unobstructed muffler/spark arrestor
• Correct line diameter and a properly feeding bump head

How the Ryobi 700R stacks up (real-world expectations)

Use this comparison to decide whether you need a higher-power trimmer or just maintenance.

Cutting situation	What a higher-power gas trimmer improves	What to do first on a Ryobi 700R
Thick weeds, tall grass	Less stalling, faster clearing	Use fresh 2-cycle mix; clean air filter
Fence lines, edging	More consistent RPM under load	Keep line at proper length; clear head debris
Brushy growth	More torque; some accept brush blades	Use the right line and technique; consider a brush-capable model if needed

If your 700R feels underpowered, fix these first

Low power is usually fuel, airflow, ignition, or a dragging cutting head.

• Drain old fuel; refill with fresh, properly mixed 2-cycle fuel
• Replace a fouled spark plug
• Clean or replace the air filter
• Remove grass wrap and debris from the string head
• Clean or replace a plugged muffler/spark arrestor

Line-feed problems can feel like “no power”

If the head will not advance line, cutting performance drops fast because the line stays too short. If the bump feed is slipping or damaged, replace the knob asm-bmp 791-153066.

Why it matters

“Most powerful” only pays off if you routinely cut heavy growth; pro trimmers are heavier and use more fuel. For typical yard trimming, a properly maintained Ryobi 700R delivers strong performance.

Last updated: February 2026