Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Kubota Z781KWi-54 — commercial: daily paid use and high acreage; 54-inch deck; gas powered
- Bad Boy Mowers Rebel SD — commercial: daily paid use and high acreage; 54-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- Z781KWi-54 uses a Kawasaki FX850-EFI engine; Rebel SD uses a Kohler engine. The engine maker builds the engine; the mower maker chooses the model, rating and fit, so the badge alone does not settle output or longevity.
- Z781KWi-54 has a Parker HTG14 transmission; Rebel SD has a 4400 Hydro-Gear® 16cc Integrated Transaxle transmission. The transmission grade tracks duty rating and speed. Grade names are each maker's own and are not comparable across brands.
- Z781KWi-54 has a 29.5 hp engine; Rebel SD has a 25 hp engine, a 4.5 hp difference. Published horsepower is the maker's rating at a stated engine speed. It is a different measure from displacement, and two engines of equal rating can pull differently.
- Z781KWi-54 has a 52 ci (852 cc) engine; Rebel SD has a 45.6 ci (747 cc) engine, a 6.4 ci difference. Displacement is the engine's size, not its output. A larger engine is not necessarily a more powerful one.
- Z781KWi-54 holds 11.6 gal (43.9 L) of fuel; Rebel SD holds 13 gal (49.2 L) of fuel, a 1.4 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
1 more difference, calculated figures and what isn’t comparable
Other verified differences
- Z781KWi-54 has a published top speed of 11.2 mph; Rebel SD has a published top speed of 12 mph, a 0.8 mph difference.
Calculated by MowerFacts
- Z781KWi-54 works out to 4.9 acres/hour; Rebel SD works out to 5.2 acres/hour, a 0.3 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Fuel Type: not published for Rebel SD.
- Deck Material: not published for Z781KWi-54.
- Drive System: not published for Rebel SD.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | Z781KWi-54 Kubota · Zero-Turn |
Rebel SD Bad Boy Mowers · Zero-Turn |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 52 ci (852 cc) | 45.6 ci (747 cc) |
| Engine Power | 29.5 hp | 25 hp |
| Engine Make | Kawasaki FX850-EFI | Kohler |
| Fuel Type | Gasoline | — |
| Deck | ||
| Cutting Width | 54 in (1372 mm) | 54 in (1372 mm) |
| Min Cut Height | 1 in (25 mm) | 1 in (25 mm) |
| Max Cut Height | 5 in (127 mm) | 5 in (127 mm) |
| Deck Material | — | 1/4" or 3-Gauge Thick Solid Steel |
| Deck Gauge | — | 3 |
| Drive | ||
| Transmission | Parker HTG14 | 4400 Hydro-Gear® 16cc Integrated Transaxle |
| Ground Speed | 11.2 mph | 12 mph |
| Drive System | Belt | — |
| Dimensions | ||
| Weight | 1254 lbs (568.8 kg) | 1257 lbs (570.2 kg) |
| Fuel Capacity | 11.6 gal (43.9 L) | 13 gal (49.2 L) |
Where these models differ, explained
Z781KWi-54: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
Rebel SD: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — badboycountry.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.