Exmark Lazer Z X-Series (LRX 72 in 921) vs Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145)
A side-by-side spec reference for two commercial machines. Where computed productivity separates them, the faster machine is marked a Data Pick with the arithmetic shown — the tables lay out each model's stated specs so you can match a machine to your property and routes.
A side-by-side for the commercial mower Exmark Lazer Z X-Series (LRX 72 in 921) and the zero-turn mower Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145). Open the full spec table in the compare tool ›
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.
- Exmark Lazer Z X-Series (LRX 72 in 921) — commercial: daily paid use and high acreage; 72-inch deck
- Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145) — commercial: daily paid use and high acreage; 72-inch deck
What’s different? The 5 differences that matter most, from the published figures.
- Lazer Z X-Series (LRX 72 in 921) uses a Kawasaki FX921V engine; ISX 3300 Zero Turn Mowers (72 in / 5902145) uses a Vanguard® BIG BLOCK™ EFI ETC with Oil Guard 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.
- Lazer Z X-Series (LRX 72 in 921) has a 31 hp engine; ISX 3300 Zero Turn Mowers (72 in / 5902145) has a 40 hp engine, a 9 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.
- Lazer Z X-Series (LRX 72 in 921) has a 10-gauge top, 7-gauge side skirt steel deck; ISX 3300 Zero Turn Mowers (72 in / 5902145) has a iCD™+ Cutting System, 2-Belt deck.
- Lazer Z X-Series (LRX 72 in 921) weighs 1,304 lbs (591.5 kg); ISX 3300 Zero Turn Mowers (72 in / 5902145) weighs 1,717 lbs (778.8 kg), a 413 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What Lazer Z X-Series (LRX 72 in 921)'s weight means for a trailer ›
- Lazer Z X-Series (LRX 72 in 921) cuts from 1 in (25 mm) to 5.5 in (140 mm); ISX 3300 Zero Turn Mowers (72 in / 5902145) cuts from 1.5 in (38 mm) to 5 in (127 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
3 more differences
Other verified differences
- Lazer Z X-Series (LRX 72 in 921) holds 12 gal (45.4 L) of fuel; ISX 3300 Zero Turn Mowers (72 in / 5902145) holds 11 gal (41.6 L) of fuel, a 1 gal difference.
- Lazer Z X-Series (LRX 72 in 921) lists at $19,899; ISX 3300 Zero Turn Mowers (72 in / 5902145) lists at $20,899, a $1,000 difference.
- Lazer Z X-Series (LRX 72 in 921) has a published top speed of 11.5 mph; ISX 3300 Zero Turn Mowers (72 in / 5902145) has a published top speed of 12 mph, a 0.5 mph difference.
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.
Productivity
| Measure | Lazer Z X-Series (LRX 72 in 921) | ISX 3300 Zero Turn Mowers (72 in / 5902145) |
|---|---|---|
| Cutting deck | 72 in | 72 in |
| Ground speed | 11.5 mph | 12 mph |
| Acres/hr (80%) | 4.68 | 4.89 |
| Acres/hr (100%) | 8.36 | 8.73 |
| List price | $19,899 | $20,899 |
Acres/hour computed from deck width and ground speed; 80% accounts for turns, overlap and trimming. Calculator ›
Components
| Component | Lazer Z X-Series (LRX 72 in 921) | ISX 3300 Zero Turn Mowers (72 in / 5902145) |
|---|---|---|
| Engine make | Kawasaki FX921V | Vanguard® BIG BLOCK™ EFI ETC with Oil Guard |
| Displacement | 999 cc | 993 cc |
| Engine power | 31 hp | 40 hp |
| Transmission | not specified by manufacturer | Dual commercial Hydro-Gear® ZT-5400 Powertrain® Transaxles with 9" cooling fans |
| Drive type | not specified by manufacturer | not specified by manufacturer |
Ownership & dimensions
| Spec | Lazer Z X-Series (LRX 72 in 921) | ISX 3300 Zero Turn Mowers (72 in / 5902145) |
|---|---|---|
| Weight | 591.48 kg | 778.82 kg |
| Fuel capacity | 45.42 L | 41.64 L |
| Warranty | not specified by manufacturer | 2 |
| Dimensions (L×W×H mm) | 2187 × 2156 × 1791 | 2146 × not specified by manufacturer × not specified by manufacturer |
Dealer network and dimensions not in our data are shown as "not specified by manufacturer." See the full spec sheet on each model page.
Alternatives to cross-shop
FAQ
Is the Exmark Lazer Z X-Series (LRX 72 in 921) or the Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145) better?
MowerFacts is a spec reference, not a review — we don't crown a winner. The Exmark Lazer Z X-Series (LRX 72 in 921) and Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145) are both commercial machines with their own deck widths, engines and dimensions; the tables below lay out each spec side by side so you can match a machine to your property and routes.
How many acres per hour can the Exmark Lazer Z X-Series (LRX 72 in 921) and Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145) mow?
At 80% efficiency the Exmark Lazer Z X-Series (LRX 72 in 921) (72-in deck at 11.5 mph) covers about 4.68 acres/hour and the Ferris ISX 3300 Zero Turn Mowers (72 in / 5902145) (72-in deck at 12 mph) about 4.89 acres/hour, before trimming and trailering time.
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Lazer Z X-Series (LRX 72 in 921): Specs verified against the retailer listing on Jun 6, 2026 — altmantractor.com.
ISX 3300 Zero Turn Mowers (72 in / 5902145): Specs verified against the manufacturer spec sheet on Jun 6, 2026 — ferrismowers.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.