RibasuBB
RibasuBB 20-Inch Self-Propelled Lawn Mower: 173cc Gas Engine Spec Analysis
The RibasuBB 20-inch self-propelled gas mower delivers reliable power through its 173cc 4-stroke gasoline engine, making it a capable workhorse for small to medium yards without battery range anxiety. Rear-wheel drive and variable speed control give it genuine hill-handling ability that most front-wheel-drive competitors can't match.
It's a straightforward, no-frills machine best suited to homeowners who want gas reliability and don't mind routine engine upkeep.
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Last updated: . Based on our analysis of 364 lawn mowers.
What Sets It Apart
Key specification highlights based on our analysis.
Steel Cutting Deck
Durable steel deck for long-term use
Rear-Wheel Drive
Better traction on hills and slopes vs front-wheel drive
Variable Speed Control
Adjustable pace to match your walking speed
Foldable Handle
Compact storage (98 of 364 mowers have this)
Considerations
80 lbs
Heavier than average (walk-behind avg: 53.1 lbs)
Why We Recommend It
- 01.
Rear-wheel drive provides superior hill traction compared to front-wheel-drive gas mowers in this tier
- 02.
Variable speed control lets you dial in a comfortable pace whether walking slowly around obstacles or moving efficiently across open lawn
- 03.
8 individual wheel height positions offer more precision than the 3-5 settings found on most entry-level mowers
- 04.
15.85-bushel rear bag handles decent clippings volume before needing to empty, reducing interruptions on medium yards
- 05.
Arrives largely pre-assembled , no complex setup required before first use
Considerations
- 01.
At 80 lbs it's notably heavier than the average walk-behind mower (53 lbs), which can make loading, unloading, and storage more physically demanding
- 02.
4-stroke gasoline engine requires ongoing maintenance , oil changes, air filter replacements, spark plug checks, and fuel stabilizer in off-season storage
- 03.
No electric start; pull cord starting can be frustrating for users with limited upper-body strength or during cold-weather first starts
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Self propelled |
| Power Source | Gas |
| Cutting Width | 20" |
| Deck Material | Steel |
| Blade Type | Rotary |
| Height Positions | 8 |
| Engine | 173cc |
| Drive | Rear wheel, Variable Speed |
| Discharge | Bag |
| Weight | 80 lbs |
| Foldable Handle | Yes |
| Start Type | Pull cord |
Power & Performance
The 173cc 4-stroke gasoline engine is the heart of this mower's high working efficiency, delivering consistent cutting power through thick, damp, or overgrown grass where underpowered electric motors bog down. Unlike 2-stroke designs, the 4-stroke engine runs on straight gasoline (no mixing), produces more torque at lower RPM, and tends to be quieter and longer-lived with proper maintenance.
That power headroom makes it genuinely capable of weeding-machine-level cleanup work on neglected lawns that lighter mowers can't handle in a single pass.
Cutting System
The 20-inch rotary steel cutting deck strikes a balance between maneuverability in tighter spaces and cutting efficiency on open lawn , smaller than the 21-22-inch decks common on full-size mowers, but wide enough to cover medium yards in a reasonable number of passes. Eight individual wheel height positions provide fine-grained control over cutting height, allowing precise adjustments for different grass species and seasonal growth rates.
The 3-in-1 discharge system (rear bag at 15.85 bushels, mulching, and side discharge) means you can bag clippings for a clean finish, mulch them back into the lawn for natural fertilization, or side-discharge when tackling heavy growth.
Drive & Handling
Rear-wheel drive self-propulsion is a meaningful upgrade over front-wheel-drive systems , when the mower's weight shifts back as the front wheels lift slightly on slopes, rear-wheel drive maintains traction where front-wheel drive loses grip. Variable speed control lets you match the mower's pace to your natural walking speed, reducing fatigue during longer sessions on medium-sized properties.
The foldable handle aids garage storage, though the 80-pound weight means maneuvering in tight spaces or lifting for transport requires some physical effort.
Battery / Fuel
As a gas-powered mower with a 4-stroke engine, runtime is effectively unlimited , you simply refuel and keep going, which is a practical advantage over battery-powered alternatives when tackling larger or heavily overgrown areas. The tradeoff is routine maintenance: the engine requires periodic oil changes (typically every 25-50 hours of use), annual air filter and spark plug inspection, and fuel stabilizer treatment before seasonal storage to prevent carburetor gumming.
entry-level approximately 30 minutes once or twice a season for basic upkeep to keep the gasoline engine running reliably for years.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with medium-sized yards (1/4 to 1/2 acre) who want self-propelled power without worrying about battery runtime running short mid-job
- ✓ Owners of sloped or mildly hilly terrain where rear-wheel drive provides the grip that front-wheel-drive or push mowers struggle to deliver
- ✓ Users who already own gas equipment and are comfortable with routine engine maintenance like oil and spark plug changes
- ✓ Buyers who prefer to mow at a variable, controlled pace and want flexibility across different grass lengths and conditions
Not Ideal For
- ✕ Eco-conscious homeowners seeking zero-emissions mowing , this gas mower produces exhaust and requires fuel, unlike battery or corded electric alternatives
- ✕ Users with very small, flat yards under 1/4 acre where a lighter push mower or battery-powered unit would be easier to maneuver and store
- ✕ Anyone who needs easy vertical storage or has a cramped garage , at 80 lbs with a foldable handle, repositioning this mower takes real effort
The RibasuBB mower arrives largely pre-assembled, so first-use setup is minimal , typically just attaching the handle, connecting the bag, and adding oil before the initial start. Most users should be ready to mow within 15-20 minutes of unboxing.
Before the very first start, check and fill the engine oil to the correct level , shipping without oil is standard practice and running the engine dry even briefly causes serious damage
Add fresh fuel and consider a fuel stabilizer from day one if you mow seasonally, saving you carburetor cleaning headaches at the start of next season
Warranty details for the RibasuBB mower are not confirmed in available product data , verify current coverage directly with the seller or manufacturer before purchase, as warranty terms on private-label gas mowers can vary significantly and directly affect long-term value.
FAQ
Is this mower truly self-propelled, and how does the variable speed work?
Yes , the rear-wheel drive self-propulsion is engaged via a handle-mounted bail or lever, and variable speed control lets you adjust how fast the mower drives itself forward. You can set it to a slower pace for careful trimming around obstacles or a faster pace when clearing open sections of lawn efficiently.
Releasing the control disengages drive instantly.
How does the 173cc gas mower handle thick or overgrown grass?
The 173cc 4-stroke gasoline engine provides enough torque to push through moderately thick and overgrown grass without bogging down , conditions where underpowered battery mowers often struggle. For heavily neglected areas, mow at a slower variable speed setting and consider a higher cutting height on the first pass, then lower on a second pass for a clean finish.
Does this mower work well on hills and sloped yards?
The rear-wheel drive system is specifically advantageous on slopes , as the mower's nose lifts slightly on an incline, rear-wheel drive continues to push where front-wheel-drive models lose traction. For moderate residential slopes this is a genuine capability advantage, though like all walk-behind mowers it should be operated side-to-side on steep grades rather than straight up and down for safety.
How often does a 4-stroke gas mower need maintenance?
Typical 4-stroke engine maintenance includes an oil check before each use, an oil change every 25-50 hours of runtime (roughly once or twice per season for average homeowners), and an annual inspection of the air filter and spark plug. The engine also needs proper fuel stabilization or draining before winter storage to prevent carburetor issues , a common reason gas mowers fail to start in spring.
What are the 8 cutting height positions, and what heights do they cover?
The 8 positions are adjusted individually at each wheel, giving you fine-grained control over cutting height across the deck. While exact measurement ranges aren't confirmed in the product specifications, most mowers in this class cover approximately 1 to 4 inches , enough for scalping warm-season grasses low or leaving cool-season grasses at the taller heights recommended for drought resistance and lawn health.
Is this mower good for a 1/4 acre yard?
Yes , a 1/4 acre yard is well within the comfortable operating range for this 20-inch self-propelled gas mower. The self-propelled rear-wheel drive reduces fatigue compared to pushing, the unlimited runtime of a gas mower means no battery swaps mid-job, and the 20-inch deck will cover a 1/4 acre in a reasonable number of passes.
It can handle up to 1/2 acre effectively, though the 80-pound weight becomes more noticeable on longer sessions.
Bottom Line
The RibasuBB 20-inch self-propelled gas mower is a capable, no-nonsense choice for homeowners with small to medium yards who want the reliability of a 4-stroke gasoline engine and the genuine hill-handling advantage of rear-wheel drive. It's heavier than average and demands routine engine upkeep, but those are expected tradeoffs for gas power in this tier.
Eco-conscious buyers or those with flat, compact yards will find better-matched alternatives in the battery-powered segment.
Best for homeowners with sloped or medium-sized yards (up to 1/2 acre) who want unlimited gas runtime and rear-wheel drive traction without stepping up to a premium tier tag.
Consider alternatives if you want zero-emissions operation, hate engine maintenance, or have a small flat yard where a lighter battery mower would be easier to handle and store.
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