Kubota Z421KWNC-54
Zero-Turn mower · Model Z421KWNC-54 · Commercial-duty · Gas
Kubota doesn’t publish a list price for this model — it’s dealer quote only. The Kubota product page is the place to start.
- Weighs 870 lb
- On a 6×12 trailer 1,770 lb towed, single-axle 3,500 lb
- Mows an acre in 20 min (14 at top speed) How long for your yard? ›
- How these are worked out ›
The Kubota Z421KWNC-54 is a commercial-grade gas zero-turn mower, built for daily commercial mowing, with a 54-inch deck and a 726cc engine making 24 hp. It weighs 870 lb (394.6 kg).
At a glance
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
Chosen by stated rules, not opinion: same class, a deck within 6 in of this one, the same kind of power and a compatible duty class, then the closest power, weight and price, with other makers preferred. Figures are the manufacturers’ published ones; nothing is estimated.
Engine
| Power Source | gas |
|---|---|
| Displacement | 44.3 ci (726 cc) |
| Engine Power | 24 hp |
| Engine Make | Kawasaki FS730V |
| Fuel Type | Gasoline |
Deck
| Cutting Width | 54 in (1372 mm) |
|---|
Drive
| Transmission | Hydro-Gear Commercial ZT-3600 |
|---|---|
| Ground Speed | 10 mph |
| Drive Tire Size | 24 x 9.5 -14, LP |
| Drive System | Belt |
Dimensions
| Weight | 870 lbs (394.6 kg) |
|---|---|
| Fuel Capacity | 6.8 gal (25.7 L) |
Professional use
How the Z421KWNC-54 fits commercial and high-acreage work, from the specs we have. Duty class: Commercial.
Productivity computed from deck width and ground speed. Compare on the calculator ›
| Deck width | 54 in |
|---|---|
| Engine make | Kawasaki FS730V |
| Engine displacement | 726 cc |
| Engine power | 24 hp |
| Transmission | Hydro-Gear Commercial ZT-3600 |
| Ground speed | 10 mph |
| Fuel capacity | 25.7 L |
| Weight | 394.6 kg |
| Drive tire size | 24 x 9.5 -14, LP |
Kubota doesn’t publish 10 of these for the Z421KWNC-54: drive type, cut-height range, warranty, commercial warranty, deck construction, deck gauge, spindle type, frame construction, anti-scalp rollers, seat type.
See the Kubota commercial pro hub › · Professional buying hub ›
Similar models
Other zero-turn mowers with comparable specs — including other brands — that buyers cross-shop with the Z421KWNC-54.
Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
See every mower with a Kawasaki FS730V engine ›
What the parts on this spec sheet mean
Other Kubota Z400 Series models › 7 more in this range: Z411KWNC-48, Z412KWNC-48, Z421KWTNC-60, Z422KWNC-54 and more
See all Kubota mowers and specs ›
Spot a wrong spec? Suggest a correction.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.
What the specs work out to
Figures MowerFacts computes from Kubota’s own numbers — not published by the manufacturer.
Mowing time
- ¼ acre5 min 3 min
- ½ acre10 min 7 min
- 1 acre20 min 14 min
- 2 acres39 min 28 min
- 5 acres1 h 38 min 1 h 9 min
- 10 acres3 h 16 min 2 h 18 min
About 20 min per acre at 3.05 acres/hour, mowing at 7.0 mph. The second figure is at the published 10.0 mph top speed (4.36 acres/hour) — faster than anyone really mows. About 20.7 acres per tank.
Weight & hauling
- Machine weight870 lb
- + 6×12 trailer900 lb
- Towed weight1,770 lb
- single-axle 3,500 lbCarries it, 1,730 lb spare
- tandem-axle 7,000 lbCarries it, 5,230 lb spare
Needs a single-axle 3,500 lb trailer and a vehicle rated to tow at least 1,770 lb.
Gate & trailer fit
- 32 in gateToo wide
- 36 in gateToo wide
- 48 in gateToo wide
Needs at least 61 in of clearance (estimated).
Power & run time
- Power per deck inch0.444 hp/in
- Run time per tank~6.8 h
Mowing times assume 3.05 acres/hour: deck width x 7.0 mph at 80% efficiency, which allows for overlap, turns and trimming. 7.0 mph is 70% of the 10.0 mph top speed Kubota publishes - almost nobody mows flat out. The "at top speed" figure is the same sum at 10.0 mph, shown so you can see it.
Fit uses the deck width plus 6 in for the discharge chute, because Kubota doesn't publish an overall width — measure before buying if a gate is tight.
Towed weight adds a 900 lb allowance for a 6x12 open utility trailer to Kubota's published machine weight. Your trailer's own weight is on its VIN plate. Tongue weight, axle placement and your vehicle's tow rating are still yours to check — this is the load, not a loading plan.
Run time assumes a typical 1 gal/hour burn at working load; real consumption varies with engine, load and cut.
Kubota Z421KWNC-54 questions
What size deck is on the Kubota Z421KWNC-54?
The Kubota Z421KWNC-54 has a 54-inch (1372 mm) cutting deck.
What engine is in the Kubota Z421KWNC-54?
The Kubota Z421KWNC-54 is powered by a Kawasaki FS730V, 726 cc, 24 hp. Horsepower is the manufacturer's own rating.
How much does the Kubota Z421KWNC-54 weigh?
The Kubota Z421KWNC-54 weighs 870 lb (394.6 kg) as specified by Kubota.
What size trailer do I need for the Kubota Z421KWNC-54?
At 870 lb, the Kubota Z421KWNC-54 on a typical 6x12 open utility trailer (about 900 lb empty) is roughly 1,770 lb of towed weight. That is within a single-axle 3,500 lb trailer, and your tow vehicle needs to be rated for at least 1,770 lb. Tongue weight, axle placement and your own trailer's empty weight still have to be checked — this is the arithmetic, not a loading plan.
How fast is the Kubota Z421KWNC-54?
Top ground speed is 10 mph. With its 54-inch deck that works out to about 4.36 acres per hour at 80% efficiency — allowing for overlap, turns and trimming.
How long does the Kubota Z421KWNC-54 take to mow an acre?
About 14 min per acre, from its 54-inch deck at 10 mph and 80% efficiency — roughly 4.36 acres an hour, so five acres is about 1 h 9 min. Rough or obstacle-heavy ground takes longer; this is deck width times ground speed, not a timed test.
How big is the fuel tank on the Kubota Z421KWNC-54?
The Kubota Z421KWNC-54 holds 6.8 gal (25.7 L) of fuel.
How much does the Kubota Z421KWNC-54 cost?
Kubota doesn't publish a list price for the Kubota Z421KWNC-54 — it's sold on a dealer quote. MowerFacts records prices only where the manufacturer publishes them.
What is the Kubota Z421KWNC-54 built for?
Commercial-duty zero-turn mower. Built for daily, paid commercial use.
Source: Kubota (manufacturer) · archived copy