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Briggs & Stratton 850 Professional-Series Commercial  Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1
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Briggs & Stratton 850 Professional-Series Commercial Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1

Item# 172794
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Only $299.99

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Factory Shipped —
Estimated Delivery: 6 - 11 Business Days
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Manufacturer's Warranty: 2 years consumer use / 1 year commercial use

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Product Summary

This Briggs & Stratton 850 Professional-Series OHV vertical shaft engine for push mowers has ReadyStart® recoil start for easy, no-prime, no-choke starts.

What's Included

  • (1) Engine, Model# 121Q72-2020-F1

Features + Benefits

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Features for Briggs & Stratton 850 Professional-Series Commercial  Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1
  • 8in. bolt circle
  • Cast iron cylinder bore
  • Large-tube muffler reduces noise levels
  • Commercial-grade air filters with dual seals

Key Specs

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Item#172794
Ship Weight30.0 lbs
Engine Displacement (cc)190
Start TypeRecoil
ApplicationWalk-behind mower
Engine Type850 Professional-series
Torque (ft./lbs.)8.5
Shaft OutputVertical
Crankshaft7/8 in. x 3 5/32in.
Shaft Diameter (in.)7/8
Shaft Length (in.)3 5/32
Shaft Keyway (in.)(2) Woodruff keys and 3/16-in. shaft keyway
Shaft End Tapped (Diameter (in.)/Threads per inch)3/8/24
Shaft Rotation (From PTO Shaft Side)CCW
Gear ReductionNo
Bearing TypeBall on PTO end, DU on flywheel
Cylinders (qty.)1
Cylinder BoreCast iron
Bore x Stroke (in.)2.69 x 2.04
Cooling SystemAir
Air Cleaner TypeCommercial-grade w/dual seal
Fuel TankYes
Fuel TypeGasoline
Fuel Tank Capacity (qt.)1.6
Fuel PumpNo
Fuel FilterNo
Oil Capacity (qt.)18–20oz.
Lubrication SystemSplash
Low Oil AlertNo
Low Oil ShutdownNo
Ignition SystemElectronic
Governor SystemMechanical
CarburetorFloat
Throttle ControlRemote or manual friction
Max. RPM3,100
Charging System AmpsNo
Muffler IncludedYes
Flywheel BrakeYes
Auto Compression ReleaseYes
Bolt Circle (in.)8
Dimensions L x W x H (in.)15.4 x 13 x 10
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Engine Specs

Customer Reviews

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Product Question + Answer

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
2 years consumer use / 1 year commercial use

Protect your purchase beyond the manufacturer's warranty
with Service Protection Plus!

DESCRIPTION (Click More Info for details) 1 Year Extension 2 Year Extension
Replacement Plan
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Replacement Plan with Accidental Damage
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Briggs & Stratton 850 Professional-Series Commercial  Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1 The price is $299.99.
Briggs & Stratton 850 Professional-Series Commercial Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1
(Not Yet Rated - New)
Item# 172794
Factory Shipped —
Estimated Delivery: 6 - 11 Business Days
Only $299.99
Hide Similarities
Engine Displacement (cc)
190 190 190 190 190
Start Type
Recoil Recoil Recoil Recoil Recoil
Application Walk-behind mower Walk-behind mower Toro lawn mower Walk-behind mower Walk-behind mower
Engine Type 675 Series 675 Series 675 Series 675 Series 850 Professional-series
Rated Power (HP) Manufacturer no longer rates this engine by HP Manufacturer no longer rates this engine by HP Manufacturer no longer rates this engine by HP Manufacturer no longer rates this engine by HP -
Torque (ft./lbs.)
6.75 6.75 6.75 6.75 8.5
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft - - - - 7/8 in. x 3 5/32in.
Shaft Diameter (in.) 7/8 63/64 (25mm) 63/64 (25mm) 7/8 7/8
Shaft Length (in.) 3 5/32 3 5/32 3 5/32 2 7/16 3 5/32
Shaft Keyway (in.)
3/16 3/16 and 2 woodruff key slots 3/16 3/16 (2) Woodruff keys and 3/16-in. shaft keyway
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24 3/8–24 7/16–20 3/8–24 3/8/24
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise CCW
Gear Reduction
- - - - No
Bearing Type
Plain Plain Plain Plain Ball on PTO end, DU on flywheel
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Aluminum alloy Aluminum alloy Aluminum alloy Aluminum alloy Cast iron
Bore x Stroke (in.)
2.69 x 2.04 2.69 x 2.04 2.69 x 2.04 2.69 x 2.01 2.69 x 2.04
Cooling System
Air cooled Air cooled Air cooled Air cooled Air
Air Cleaner Type
Automotive type pleated paper Automotive type pleated paper Dual element Automotive style paper filter Commercial-grade w/dual seal
Fuel Tank Yes Yes Yes Yes Yes
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
1.6 1.6 1.6 1.6 1.6
Fuel Pump
- - - - No
Fuel Filter
- - - - No
Oil Capacity (qt.)
0.56–0.63 (18-20 oz.) 0.56–0.63 (18-20 oz.) 0.56–0.63 (18–20 oz.) 0.56–0.63 (18–20 oz.) 18–20oz.
Lubrication System
Splash Splash Splash Spash Splash
Low Oil Alert
No No - No No
Low Oil Shutdown
- - - - No
Ignition System
Electronic Electronic Electronic Electronic Electronic
Governor System
Mechanical Mechanical Mechanical Mechanical Mechanical
Carburetor
Float Float Float Float Float
Throttle Control
Manual friction, remote Manual friction Manual friction, remote Manual friction, remote Remote or manual friction
Max. RPM
3,100 3,100 3,100 3,100 3,100
Charging System Amps - - - - No
Muffler Included
Yes Yes Yes Yes Yes
Flywheel Brake
- Yes - Yes Yes
Auto Compression Release
Yes Yes Yes Yes Yes
Bolt Circle (in.)
8 8 8 8 8
Dimensions L x W x H (in.)
13 x 11 1/2 x 9 3/4 13 x 11 1/2 x 9 3/4 13 x 11 1/2 x 9 3/4 13 x 11 1/2 x 9 3/4 15.4 x 13 x 10
EPA/CARB Approval (California Air Resource Board)
No Yes Yes Yes Yes