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Kubota Z121S Zero Turn Mower Specs

Kubota Z121S Engine

Engine Model ............... Kohler Confidant ZT720 (GH736V, GH7301V)
Engine Type ............... 4-cycle V-twin cylinder OHV vertical shaft air-cooled gasoline engine
Number of Cylinders ............... 2
Displacement, cu.in (cc) ............... 44.2 (725)
Engine Bore, in (mm) ............... 3.27 (83.0)
Engine Stroke, in (mm) ............... 2.60 (67.0)
Rated Engine Power, hp (kW) ............... 21.0 (15.7)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lbs) ............... 55.2 (40.7)
Torque Speed, rpm ............... 2800
Compression Ratio ............... 9.1:1
Fuel System ............... Carburetor
Carburetor Type ............... Fixed main jet
Fuel Pump ............... Pulse type
Governor Type ............... Mechanical
Lubrication System ............... Full pressure
Oil Filter ............... Full-flow type
Air Cleaner Type ............... Dual element
Ignition System ............... Electronic
Spark Plug Type ............... Champion RC12YC
Spark Plug Gap, in (mm) ............... 0.03 (0.76)
Module Air Gap, in (mm) ............... 0.008-0.012 (0.203-0.305)
Intake Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Exhaust Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Fuel Tank Capacity, gal (L) ............... 4.3 (16.3)
Oil Capacity, qts (L) ............... 2.0 (1.9)

Electrical System

Electrical System Rating, Volts ............... 12
Charging System ............... Alternator
Alternator Rating, Amps ............... 15
Starting System ............... Electric starter

Power Take Off

PTO Operational Type ............... Independent
PTO Clutch ............... Electric
PTO Speed, rpm ............... 3600

Kubota Z121S Transmission

Transmission Model ............... Hydro-Gear ZT-3100
Transmission Type ............... Dual hydrostatic
Number of Forward Gears ............... Infinite
Number of Reverse Gears ............... Infinite
Oil Capacity, qts (L) ............... 5.0 (4.7)
Maximum Forward Speed, mph (kph) ............... 8.0 (12.9)
Maximum Reverse Speed, mph (kph) ............... 4.0 (6.4)

Wheels and Tires

Drive Wheels ............... 2WD 4x2
Steering Configuration ............... Front steer
Steering System ............... 2-hand levers
Front Tire Size ............... 11x4.00-5
Rear Tire Size ............... 22x10.00-14
Front Tread, in (mm) ............... 31.3 (795)
Rear Tread, in (mm) ............... 37.6 (955)

Dimensions and Weight

Wheelbase, in (mm) ............... 45.5 (1155)
Overall Length, in (mm) ............... 76.4 (1940)
Overall Heigth (ROPS), in (mm) ............... 65 (1650)
Overall Width, in (mm) ............... 47.5 (1205)
Ground clearance, in (mm) ............... 4.8 (123)
Weight, lb (kg) ............... 750 (340)

Mower Deck

Mower Deck Model ............... RCK48P-124Z
Mower Deck Type ............... Mid-mount
Deck Construction ............... Fabricated
Number of Blades ............... 3
Cutting Width, in (mm) ............... 48 (1220)
Total Width, in (mm) ............... 61.1 (1550)
Cutting Height, in (mm) ............... 1.5-4.5 (37-114)
Blade Engagement ............... Electric
Blade Length, in (mm) ............... 16.7 (425)
Lift System ............... Mechanical, foot operated