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.
- Scag SLS — commercial: daily paid use and high acreage; 42-inch deck; gas powered
- Gravely ZT XL 42 KAWASAKI — commercial: daily paid use and high acreage; 42-inch deck; gas powered
What’s different? The 3 differences that matter most, from the published figures.
- SLS uses a Briggs & Stratton® PXi Series™ engine; ZT XL 42 KAWASAKI uses a Kawasaki® 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.
- SLS has Hydro-Gear ZT2200 (EZT) drive; ZT XL 42 KAWASAKI has Hydro-Gear® ZT-2800® Transaxles drive.
- SLS has a 20 hp engine; ZT XL 42 KAWASAKI has a 21.5 hp engine, a 1.5 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.
what isn’t comparable
Not comparable
- Displacement: not published for SLS.
- Weight: not published for SLS.
- Fuel Type: not published for SLS.
- Deck Material: not published for SLS.
- Discharge: not published for SLS.
- Cut height range: not published for ZT XL 42 KAWASAKI.
- Price: SLS 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 | SLS Scag · Zero-Turn |
ZT XL 42 KAWASAKI Gravely · Zero-Turn |
|---|---|---|
| List price | dealer quote | $5,499 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | — | 44.3 ci (726 cc) |
| Engine Power | 20 hp | 21.5 hp |
| Engine Make | Briggs & Stratton® PXi Series™ | Kawasaki® |
| Engine Model | — | FR651V |
| Fuel Type | — | Gas |
| Deck | ||
| Cutting Width | 42 in (1067 mm) | 42 in (1067 mm) |
| Min Cut Height | 1.5 in (38 mm) | — |
| Max Cut Height | 4.5 in (114 mm) | — |
| Deck Material | — | 11 ga |
| Deck Construction | Dual-plate cutter deck constructed of 2 steel plates. Reinforcement plate at cutter deck spindles. | Fabricated X-Factor® |
| Deck Gauge | — | 11 |
| Discharge | — | Side |
| Drive | ||
| Ground Speed | 7 mph | 7 mph |
| Drive Tire Size | 20″ x 8″-8″ (42”)20″ x 10″-8″ (52”)20″ x 10″-8″ (61”) | — |
| Reverse Speed | 5 mph | 3 mph |
| Drive System | Hydro-Gear ZT2200 (EZT) | Hydro-Gear® ZT-2800® Transaxles |
| Dimensions | ||
| Weight | — | 675 lbs (306.2 kg) |
| Fuel Capacity | 3.5 gal (13.2 L) | 3.5 gal (13.2 L) |
Where these models differ, explained
SLS: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
ZT XL 42 KAWASAKI: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — gravely.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.