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Masport Contractor ST S21 3'n1 SP B&S

Push / Walk-Behind mower · Model 564929 · Residential-duty · Gas

A$1,899 Masport Australia RRP

Recommended retail price in Australian dollars, read 20 Oct 2026 from the Masport Australia product page. Whether it includes GST is not stated on the page.

Sold in Australia — listed on masport.com, checked 20 Oct 2026.

Dealers set the final price; delivery, assembly and any local offer are extra and are not tracked here.

The Masport Contractor ST S21 3'n1 SP B&S is a residential-grade gas walk-behind mower, suited to small-to-mid home lawns, with a 21-inch deck and a 190cc engine. It weighs 123.9 lb (56.2 kg).

At a glance

Power Source
gas
Cutting Width
21.3 in (540 mm)
Displacement
11.6 ci (190 cc)
Weight
124 lbs (56.2 kg)
Compare this mower: Pick another Masport push / walk-behind or pick from every push / walk-behind mower sold in Australia   or quick compare: vs 100 ST 2'n1 · vs 200 ST 3'n1 · vs 2'n1 Time Saver - DOV
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
  • Bushranger 53AL7IMSP, 800SP Series Self-Propelled Lawn Mower
    Deck 533 mm (21 in) · Air cooled, single cylinder OHV, vertical shaft, normally aspirated petrol four stroke engine, 196 cc · RRP A$1,399
    Max cut height 76 mm (3 in) (this model: 60 mm (2.4 in))Weight 52 kg (115 lbs) (this model: 56.2 kg (124 lbs))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 21.3 in · Gas engine, like this model · Residential-duty, like this model · By Bushranger, a different maker
    Compare with the Contractor ST S21 3'n1 SP B&S ›
  • Victa 21 in Alloy Base, Commercial, Mulch or Catch Self-Propelled…
    Deck 533 mm (21 in) · Briggs & Stratton, 190 cc · RRP A$1,679
    Max cut height 83 mm (3.3 in) (this model: 60 mm (2.4 in))Weight 48 kg (106 lbs) (this model: 56.2 kg (124 lbs))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 21.3 in · Gas engine, like this model · Residential-duty, like this model · By Victa, a different maker
    Compare with the Contractor ST S21 3'n1 SP B&S ›
  • Bushranger 53AH6IMSP, 800SP Series Self-Propelled Lawn Mower
    Deck 533 mm (21 in) · Honda GXV160, 163 cc · RRP A$1,899
    Max cut height 76 mm (3 in) (this model: 60 mm (2.4 in))Displacement 163 cc (9.9 ci) (this model: 190 cc (11.6 ci))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 21.3 in · Gas engine, like this model · Residential-duty, like this model · By Bushranger, a different maker
    Compare with the Contractor ST S21 3'n1 SP B&S ›
  • Cox 21 in LawnMaster Self Propelled
    Deck 533 mm (21 in) · 224 cc · RRP A$1,699
    Displacement 224 cc (13.7 ci) (this model: 190 cc (11.6 ci))Weight 52 kg (115 lbs) (this model: 56.2 kg (124 lbs))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 21.3 in · Gas engine, like this model · Residential-duty, like this model · By Cox, a different maker
    Compare with the Contractor ST S21 3'n1 SP B&S ›
  • Kubota W821S
    Deck 530 mm (20.9 in) · 4.3 hp, 163 cc
    Max cut height 77 mm (3 in) (this model: 60 mm (2.4 in))Displacement 163 cc (9.9 ci) (this model: 190 cc (11.6 ci))
    Why: Same class: push / walk-behind · 20.9 in deck, within 2 in of this model's 21.3 in · Gas engine, like this model · Residential-duty, like this model · By Kubota, a different maker
    Compare with the Contractor ST S21 3'n1 SP B&S ›

Chosen by stated rules, not opinion: same class, a deck within 2 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

Masport Contractor ST S21 3'n1 SP B&S engine specifications
Power Sourcegas
Displacement11.6 ci (190 cc)
Start TypeReadyStart
Engine MakeBriggs & Stratton
Engine ModelOHV Series 850 Professional IC

Deck

Masport Contractor ST S21 3'n1 SP B&S deck specifications
Cutting Width21.3 in (540 mm)
Min Cut Height0.5 in (13 mm)
Max Cut Height2.4 in (60 mm)
Deck MaterialDeep draw heavy duty steel
Blades4
Cut Positions11
DischargeCut, Catch, Mulch, Rear Discharge

Drive

Masport Contractor ST S21 3'n1 SP B&S drive specifications
Drive SystemGT Agility PRO 3 Speed Commercial

Dimensions

Masport Contractor ST S21 3'n1 SP B&S dimensions specifications
Weight124 lbs (56.2 kg)

General

Masport Contractor ST S21 3'n1 SP B&S general specifications
Bagger Capacity2.3 bu (80 L)

Similar models

Other push / walk-behind mowers with comparable specs — including other brands — that buyers cross-shop with the Contractor ST S21 3'n1 SP B&S.

54V XR FLEXVOLT Push Lawn Mower (Tool Only) DeWalt · 20.9 in (530 mm)
2x18V XR Self-Propelled Lawn Mower - 2 x 8 Ah DeWalt · 20.9 in (530 mm)
RMA 756 V Battery Lawn Mower STIHL · 21.3 in (540 mm)
21 in Alloy Base, Commercial, Mulch or Catch Self-Propelled… Victa · 21 in (533 mm)
53AL7IMSP, 800SP Series Self-Propelled Lawn Mower Bushranger · 21 in (533 mm)
POWER+ 52cm Select Cut Mower with Touch Drive Self-Propelled… EGO · 20.5 in (520 mm)

See all Masport mowers and specs ›

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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 Masport’s own numbers — not published by the manufacturer.

Gate & trailer fit

  • 32 in gateFits
  • 36 in gateFits
  • 48 in gateFits

Needs at least 28 in of clearance (estimated).

Fit uses the deck width plus 6 in for the discharge chute, because Masport doesn't publish an overall width — measure before buying if a gate is tight.

Source: Masport (manufacturer) · archived copy

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