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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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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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Was $339.99
Sale $319.99

Save $20.00

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  • 8in. bolt circle
  • Cast iron cylinder bore
  • Large-tube muffler reduces noise levels
  • Commercial-grade air filters with dual seals
Factory Shipped —
Estimated Delivery: 4 - 6 Business Days
Ship it | See Shipping Options
Not Available in Stores
 

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

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
Item# 172794
Brand Briggs & Stratton
Manufacturer's Warranty 2 years consumer use / 1 year commercial use
Ship Weight 30.0 lbs
Engine Displacement (cc) 190
Start Type Recoil
Application Walk-behind mower
Engine Type 850 Professional-series
Torque (ft./lbs.) 8.5
Shaft Output Vertical
Crankshaft 7/8 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 Reduction No
Bearing Type Ball on PTO end, DU on flywheel
Cylinders (qty.) 1
Cylinder Bore Cast iron
Bore x Stroke (in.) 2.69 x 2.04
Cooling System Air
Air Cleaner Type Commercial-grade w/dual seal
Fuel Tank Yes
Fuel Type Gasoline
Fuel Tank Capacity (qt.) 1.6
Fuel Pump No
Fuel Filter No
Oil Capacity (qt.) 18–20 oz.
Lubrication System Splash
Low Oil Alert No
Low Oil Shutdown No
Ignition System Electronic
Governor System Mechanical
Carburetor Float
Throttle Control Remote or manual friction
Max. RPM 3,100
Charging System Amps No
Muffler Included Yes
Flywheel Brake Yes
Auto Compression Release Yes
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

Customer Reviews

Product Question + Answer
Replacement Parts
Call To Order: 1-800-657-0516

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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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 $319.99.
Briggs & Stratton 850 Professional-Series Commercial Replacement Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121Q72-2020-F1
4.4 / 5 (7)
Item# 172794
Factory Shipped —
Estimated Delivery: 4 - 6 Business Days
Was $339.99
Sale $319.99
Save $20.00
Hide Similarities
Engine Displacement (cc)
163 190 190 190 190
Start Type
ReadyStart, rewind Recoil Recoil Recoil Recoil
Application Walk-behind rotary mower engine Walk-behind mower Walk-behind mower Walk-behind mower Walk-behind mower
Engine Type Gasoline, single-cylinder 4-cycle 850 Professional-series 675 Series 675 series 850 Professional-series
Torque (ft./lbs.)
7.25 8.5 6.75 6.75 8.5
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft Vertical 25mm x 3 5/32in. - - 7/8 in. x 3 5/32in.
Shaft Diameter (in.) 7/8 25mm 7/8 7/8 7/8
Shaft Length (in.) 3 5/32 3 5/32 2 7/16 1 13/16 3 5/32
Shaft Keyway (in.)
3/16 square (2) Woodruff keys and 3/16-in. shaft keyway 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 3/8–24 3/8–24 3/8/24
Shaft Rotation (From PTO Shaft Side) CCW CCW Counterclockwise Counterclockwise CCW
Gear Reduction
No No - - No
Bearing Type
- Ball on PTO end, DU on flywheel Plain Plain Ball on PTO end, DU on flywheel
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Aluminum Cast iron Aluminum alloy Aluminum alloy Cast iron
Bore x Stroke (in.)
2.69 x 1.75 2.69 x 2.04 2.69 x 2.01 2.69 x 2.04 2.69 x 2.04
Cooling System
Air cooled Air Air cooled Air cooled Air
Air Cleaner Type
Paper cartridge Commercial-grade w/dual seal Automotive style paper filter Automotive style paper filter Commercial-grade w/dual seal
Fuel Tank 1.09 Yes Yes Yes Yes
Fuel Type Regular gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
1.09 1.6 1.6 1.6 1.6
Fuel Pump
- No - - No
Fuel Filter
No No - - No
Oil Capacity (qt.)
15 18–20 oz. 0.56–0.63 (18–20 oz.) 0.56–0.63 (18–20 oz.) 18–20 oz.
Lubrication System
Dura Lube splash Splash Spash Splash Splash
Low Oil Alert
No No No No No
Low Oil Shutdown
No No - - No
Ignition System
Magnetron Electronic Electronic Electronic Electronic
Governor System
Mechanical Mechanical Mechanical Mechanical Mechanical
Carburetor
Float type Float Float Float Float
Throttle Control
Fixed speed Remote or manual friction Manual friction, remote Manual friction, remote Remote or manual friction
Choke Control No - - - -
Max. RPM
3,200 3,100 3,100 3,100 3,100
Charging System Amps None No - - No
Muffler Included
Yes Yes Yes Yes Yes
Flywheel Brake
CPSC blade brake Yes 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.)
16 x 12 1/2 x 13 15.4 x 13 x 10 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)
Yes Yes Yes - Yes
Product Weight (lbs.) 24 - - - -