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 Z781KWiTW-54 — commercial: daily paid use and high acreage; 54-inch deck; gas powered
- Spartan Spartan RZ-HD — 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.
- Z781KWiTW-54 uses a Kawasaki FX850VEFI engine; Spartan RZ-HD uses a Briggs 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.
- Z781KWiTW-54 cuts from 1 in (25 mm) to 5.5 in (140 mm); Spartan RZ-HD cuts from 1.5 in (38 mm) to 4.8 in (121 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
- Z781KWiTW-54 has a published top speed of 11.2 mph; Spartan RZ-HD has a published top speed of 9 mph, a 2.2 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- Z781KWiTW-54 holds 11.6 gal (43.9 L) of fuel; Spartan RZ-HD holds 9.5 gal (36 L) of fuel, a 2.1 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.
- Z781KWiTW-54 weighs 1,254 lbs (568.8 kg); Spartan RZ-HD weighs 1,095 lbs (496.7 kg), a 159 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What Z781KWiTW-54's weight means for a trailer ›
1 more difference, calculated figures and what isn’t comparable
Other verified differences
- Z781KWiTW-54 has a 29.5 hp engine; Spartan RZ-HD has a 27 hp engine, a 2.5 hp difference.
Calculated by MowerFacts
- Z781KWiTW-54 works out to 4.9 acres/hour; Spartan RZ-HD works out to 3.9 acres/hour, a 1.0 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
- Displacement: not published for Spartan RZ-HD.
- Warranty: not published for Z781KWiTW-54.
- Transmission: not published for Spartan RZ-HD.
- Fuel Type: not published for Spartan RZ-HD.
- Deck Construction: not published for Z781KWiTW-54.
- Drive System: not published for Spartan RZ-HD.
- Price: Z781KWiTW-54 is dealer quote only.
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 | Z781KWiTW-54 Kubota · Zero-Turn |
Spartan RZ-HD Spartan · Zero-Turn |
|---|---|---|
| List price | dealer quote | $7,699 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 52 ci (852 cc) | — |
| Engine Power | 29.5 hp | 27 hp |
| Engine Make | Kawasaki FX850VEFI | Briggs |
| Fuel Type | Gasoline | — |
| Deck | ||
| Cutting Width | 54 in (1372 mm) | 54 in (1372 mm) |
| Min Cut Height | 1 in (25 mm) | 1.5 in (38 mm) |
| Max Cut Height | 5.5 in (140 mm) | 4.8 in (121 mm) |
| Deck Construction | — | 5" Deep, Reinforced 7 Gauge Full-Floating Deck |
| Deck Gauge | 8 | — |
| Drive | ||
| Transmission | Parker HTG14 | — |
| Ground Speed | 11.2 mph | 9 mph |
| Drive Tire Size | — | 24x12-12 Reapers |
| Drive System | Belt | — |
| Dimensions | ||
| Weight | 1254 lbs (568.8 kg) | 1095 lbs (496.7 kg) |
| Fuel Capacity | 11.6 gal (43.9 L) | 9.5 gal (36 L) |
| Length | 83.9 in (2131 mm) | 84 in (2134 mm) |
| Width | 67.3 in (1709 mm) | — |
| Height | 48.6 in (1234 mm) | 75 in (1905 mm) |
| Commercial / Pro | ||
| Frame Construction | — | 1.5" by 3" Powder Coated Fusion-Bonded Solid Steel Bridge Frame |
| Seat Type | — | Deluxe Seat |
| General | ||
| Warranty | — | 3 yr |
Where these models differ, explained
Z781KWiTW-54: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
Spartan RZ-HD: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — joinspartannation.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.