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Briggs & Stratton Pro-Series Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121S02-2015
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Briggs & Stratton Pro-Series Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121S02-2015

Item# 172790

Only $269.99
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Estimated Delivery: 6 - 11 Business Days
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Manufacturer's Warranty: 24 months consumer / 90 day commercial

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Product Summary

The Briggs & Stratton Pro-Series™ OHV engines were designed to provide an experience that combines power, performance, features and size. This engine offers consumers and professionals commercial-grade features including easier starting, smooth and quiet operation, increased durability and longer life. U.S.A.

What's Included

  • (1) Engine, Model# 121S02-2015

Features + Benefits

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Features for Briggs & Stratton Pro-Series Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121S02-2015
  •  ReadyStart recoil ignition starts with no prime or choke
  • Certified to CARB Tier III
  • Meets EPA 2012 phase 3 standards

Key Specs

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Item#172790
Ship Weight29.0 lbs
Engine Displacement (cc)190
Start TypeRecoil
ApplicationWalk-behind mower
Engine TypeProfessional 875 Series OHV
Rated Power (HP)Manufacturer no longer rates this engine by HP
Torque (ft./lbs.)8.75
Shaft OutputVertical
Shaft Diameter (in.)7/8
Shaft Length (in.)3 5/32
Shaft Keyway (in.)3/16 and 2 woodruff key slots
Shaft End Tapped (Diameter (in.)/Threads per inch)3/8–24
Shaft Rotation (From PTO Shaft Side)Counterclockwise
Bearing TypePlain
Cylinders (qty.)1
Cylinder BoreAluminum alloy
Bore x Stroke (in.)2.69 x 2.04
Cooling SystemAir cooled
Air Cleaner TypeCommercial-grade w/dual seal
Fuel TankYes
Fuel TypeGasoline
Fuel Tank Capacity (qt.)1.6
Oil Capacity (qt.)0.56–0.63 (18–20 oz.)
Lubrication SystemSplash
Ignition SystemElectronic
Governor SystemMechanical
CarburetorFloat
Throttle ControlManual friction, remote
Max. RPM3,100
Muffler IncludedYes
Flywheel BrakeYes
Auto Compression ReleaseYes
Bolt Circle (in.)8
Dimensions L x W x H (in.)15 3/8 x 13 3/4 x 10
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Engine Specs

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Product Question + Answer

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
24 months consumer / 90 day commercial

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

DESCRIPTION (Click More Info for details) 1 Year Extension 2 Year Extension
Extended Warranty Replacement Plan
Only $24.99
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Only $39.99
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Extended Warranty + Accidental Damage Replacement Plan
Only $34.99
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Briggs & Stratton Pro-Series Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121S02-2015 The price is $269.99.
Briggs & Stratton Pro-Series Push Mower Engine — 190cc, 7/8in. x 3 5/32in. Shaft, Model# 121S02-2015
(Not Yet Rated - New)
Item# 172790
Factory Shipped —
Estimated Delivery: 6 - 11 Business Days
Only $269.99
Hide Similarities
Engine Displacement (cc)
190 190 190 190 190
Start Type
Recoil Recoil Recoil Recoil Recoil
Application Walk-behind mower Walk-behind mower Walk-behind mower Walk-behind mower Walk-behind mower
Engine Type 675 Series 675 Series 850 Professional-series 675 Series Professional 875 Series OHV
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 8.5 6.75 8.75
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft - - 25mm x 3 5/32in. - -
Shaft Diameter (in.) 7/8 63/64 (25mm) 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 (2) Woodruff keys and 3/16-in. shaft keyway 3/16 3/16 and 2 woodruff key slots
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) Counterclockwise Counterclockwise CCW Counterclockwise Counterclockwise
Gear Reduction - - No - -
Bearing Type
Plain Plain Ball on PTO end, DU on flywheel Plain Plain
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Aluminum alloy Aluminum alloy Cast iron Aluminum alloy Aluminum alloy
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 Air cooled Air cooled
Air Cleaner Type
Automotive type pleated paper Automotive type pleated paper Commercial-grade w/dual seal 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.) 18–20oz. 0.56–0.63 (18–20 oz.) 0.56–0.63 (18–20 oz.)
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 Remote or manual friction Manual friction, remote Manual friction, remote
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 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 15.4 x 13 x 10 13 x 11 1/2 x 9 3/4 15 3/8 x 13 3/4 x 10
EPA/CARB Approval (California Air Resource Board)
No Yes Yes Yes Yes