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Kohler Confidant Air Cooled Vertical Engine — 725cc with Electric Start, Model# PA-ZT720-3017

Item# 51557
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Kohler Confidant Air Cooled Vertical Engine — 725cc with Electric Start, Model# PA-ZT720-3017

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Only $849.99
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  • 725cc, 21 HP engine with 1in.dia. x 3.16in.L shaft
  • 12V ignition system with solenoid shift starter
  • 10in. mounting bolt pattern
  • Ideal for wide area walk-behind, stand-on and commercial riding mowers
  • Consistent-Cut™ technology provides more consistent power to your deck
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Estimated Delivery: 5 - 7 Business Days
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Product Summary

This Kohler Confidant® 725cc Air Cooled Vertical Engine with electric start is ideal for wide area walk-behind, stand-on, and commercial mowers. Features a 12 Amp regulated charging system and 12V ignition system with solenoid shift starter.

What's Included
  •  (1) Air cooled vertical engine

Features + Benefits

  • 725cc, 21 HP engine with 1in.dia. x 3.16in.L shaft
  • 12V ignition system with solenoid shift starter
  • 10in. mounting bolt pattern
  • Ideal for wide area walk-behind, stand-on and commercial riding mowers
  • Consistent-Cut™ technology provides more consistent power to your deck
  • High-torque inertia drive starter with extra-large output for quick, reliable starting
  • Chopper grass screen guard prevents grass and debris packing
  • Dual-seal, heavy-duty cyclonic air filter protects the engine
  • Cast iron cylinder bores offer protection under dirty conditions
  • Pressure lubrication extends engine life
  • Oil Sentry low oil shutdown system
Key Specs
Item# 51557
Brand Kohler Engines
Manufacturer's Warranty 3 Yr Consumer Limited
Ship Weight 95.0 lbs
Engine Displacement (cc) 725
Start Type Electric
Application Walk-behind, stand-on, commercial rider mower
Engine Type Air cooled
Torque (ft./lbs.) 40.7 (55.2 Nm) at 3,600 RPM
Displacement (cu. in.) 725
Shaft Output CCW
Crankshaft Hardened
Shaft Diameter (in.) 1
Shaft Length (in.) 3.16
Shaft Keyway (in.) 7/16-20
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16-20
Shaft Rotation (From PTO Shaft Side) ccw
Bearing Type Parent material
Cylinders (qty.) 2
Cylinder Bore Cast iron cylinder sleeve
Bore x Stroke (in.) 3.3 x 2.6
Compression Ratio 9.1:1
Cooling System Air
Air Cleaner Type Cyclonic air filter w/Quad Clean
Fuel Type Gasoline
Fuel Pump Pulse type
Fuel Filter Pro performance (9-12 micron)
Oil Capacity (qt.) 2
Lubrication System Pressure lubrication with full flow
Low Oil Alert Yes
Low Oil Shutdown Oil Sentry
Ignition System 12V solenoid shift starter
Governor System Mechanical
Carburetor Smart choke
Throttle Control Remote
Choke Control Remote
Max. RPM 3,600
Charging System Amps 12A regulated
Muffler Included Optional
Auto Compression Release Yes
Bolt Circle (in.) 10
Mounting Base L x W (in.) 10 D.B.C.; 4 cored holes (for OEM self tap)
Mounting Bolt Pattern L x W (in.) 10
Dimensions L x W x H (in.) 18 4/5 x 17 1/2 x 17
EPA/CARB Approval (California Air Resource Board) Yes

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Item# 51556
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
Only $789.99
Kohler Confidant Air Cooled Vertical Engine — 725cc with Electric Start, Model# PA-ZT720-3017 The price is $849.99.
Kohler Confidant Air Cooled Vertical Engine — 725cc with Electric Start, Model# PA-ZT720-3017
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Hide Similarities
Engine Displacement (cc)
725 725 674 725 725
Start Type
Recoil Electric Electric Electric Electric
Application Walk-behind, stand-on, commercial mower Walk-behind, stand-on, commercial rider mower Sod cutter, greens mower, walk-behind and zero-turn mowers, golf cart, aerator, blower and more Walk-behind mower, zero-turn mower, garden tractor WAWB, Zero-turn mowers, garden tractors
Engine Type Vertical Air cooled Gas vertical Air cooled Gasoline/air
Torque (ft./lbs.)
40.7 (55.2 Nm) at 3,600 RPM 40.7 (55.2 Nm) at 3,600 RPM 35.8 (48.5 Nm) at 3,600 RPM 36.9 (50 Nm) at 3,600 RPM 39.2 (53.1 Nm) at 3,600 RPM
Displacement (cu. in.)
725 725 41 725 725
Shaft Output
CCW CCW CCW CCW CCW
Crankshaft Hardened Hardened Hardened Hardened Hardened
Shaft Diameter (in.) 1 1 1 1 1/8 1.125
Shaft Length (in.) 3.16 3.16 3.16 3 5/16 3.16
Shaft Keyway (in.)
7/16-20 7/16-20 0.25 1/4 0.25
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16-20 7/16-20 1.5 x 7/16 - 20 UNF 7/16–20 UNF 7/16–20 UNF
Shaft Rotation (From PTO Shaft Side) CCW ccw CCW CCW CCW
Gear Reduction - - No - -
Bearing Type
Parent material Parent material PTO sleeve bearing Sleeve Sleeve
Cylinders (qty.)
2 2 2 2 2
Cylinder Bore
Cast iron cylinder sleeve Cast iron cylinder sleeve Cast iron cylinder liner Cast iron liner Cast iron liner
Bore x Stroke (in.)
3.3 x 2.6 3.3 x 2.6 3 x 2.6 3.3 x 2.6 3.3 x 2.6
Compression Ratio
9.1:1 9.1:1 8.5:1 9:1 9:1
Cooling System
Air Air Air Air Air
Air Cleaner Type
Cyclonic air filter w/Quad Clean Cyclonic air filter w/Quad Clean Dual element Dual element Dual element
Fuel Tank - - No - -
Fuel Type Gasoline Gasoline Gas Gasoline Gasoline
Fuel Pump
Pulse type Pulse type Pulse Yes Pulse style
Fuel Filter
Pro performance (9-12 micron) Pro performance (9-12 micron) Large capacity in-line fuel filter Yes Yes
Oil Capacity (qt.)
2 2 2 2 2
Lubrication System
Pressure lubrication with full flow Pressure lubrication with full flow Full pressure Full pressure Full pressure
Low Oil Alert
Yes Yes Oil Sentry, shipped disconnected Yes Yes
Low Oil Shutdown
Oil Sentry Oil Sentry Oil Sentry, shipped disconnected Yes Yes
Ignition System
Electronic 12V solenoid shift starter Electronic Electronic Electronic
Governor System
Mechanical Mechanical Variable speed Mechanical Mechanical
Carburetor
Smart choke Smart choke High performance accelerator pump carburetor Smart choke Smart choke
Throttle Control
Remote Remote Remote Remote Remote
Choke Control
Remote Remote Remote Remote Remote
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 15 unregulated 12A regulated 20A alternator, regulated 20A regulated 20A regulated
Muffler Included
Optional Optional No Yes Yes
Auto Compression Release Yes Yes No - -
Bolt Circle (in.)
10 10 10-in. mounting base 10 10
Mounting Base L x W (in.)
10 D.B.C.; 4 cored holes (for OEM self tap) 10 D.B.C.; 4 cored holes (for OEM self tap) 10-in. mounting base 10 in. bolt circle 10 in. bolt circle
Mounting Bolt Pattern L x W (in.) 10 10 10-in. mounting base - 10 in. bolt circle
Dimensions L x W x H (in.)
18 4/5 x 17 1/2 x 17 18 4/5 x 17 1/2 x 17 21.2 x 17.7 x 14.3 21 x 17 3/4 x 14.3 21 x 17 3/4 x 14
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes