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Briggs & Stratton OHV Lawn Mower Engine — 163cc, 7/8in. x 3 5/32in. Shaft, Model# 104M02-0021-F1

Item# 54969
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Briggs & Stratton OHV Lawn Mower Engine  — 163cc, 7/8in. x 3 5/32in. Shaft, Model# 104M02-0021-F1

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Only $169.99
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  •  No prime, no choke easy-pull recoil starts
  •  Maintenance-free Magnetron® electronic ignition for quick, dependable starts
  • Acoustically engineered muffler provides quiet operation and excellent tonal quality
  • Easy-fill angled fuel neck is 2x the size of standard models
  • Dual-sealing air cleaner offers better debris resistance for longer life
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Product Summary

Briggs & Stratton OHV Lawn Mower Engine produces 7.25 ft.-lbs. gross torque for powerful performance. The engine's ReadyStart™ system requires no priming and no choking — just pull and go. For use with walk-behind rotary mowers.

What's Included
  • (1) Engine, Model# 104M02-0021-F1

Features + Benefits

  •  No prime, no choke easy-pull recoil starts
  •  Maintenance-free Magnetron® electronic ignition for quick, dependable starts
  • Acoustically engineered muffler provides quiet operation and excellent tonal quality
  • Easy-fill angled fuel neck is 2x the size of standard models
  • Dual-sealing air cleaner offers better debris resistance for longer life
Key Specs
Item# 54969
Brand Briggs & Stratton
Manufacturer's Warranty 24 months parts / 24 months labor
Ship Weight 24.0 lbs
Engine Displacement (cc) 163
Start Type ReadyStart, rewind
Application Walk-behind rotary mower engine
Engine Type Gasoline, single-cylinder 4-cycle
Torque (ft./lbs.) 7.25
Shaft Output Vertical
Crankshaft Vertical
Shaft Diameter (in.) 7/8
Shaft Length (in.) 3 5/32
Shaft Keyway (in.) 3/16 square
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24
Shaft Rotation (From PTO Shaft Side) CCW
Gear Reduction No
Cylinders (qty.) 1
Cylinder Bore Aluminum
Bore x Stroke (in.) 2.69 x 1.75
Cooling System Air cooled
Air Cleaner Type Paper cartridge
Fuel Tank 1.09
Fuel Type Regular gasoline
Fuel Tank Capacity (qt.) 1.09
Fuel Filter No
Oil Capacity (qt.) 15
Lubrication System Dura Lube splash
Low Oil Alert No
Low Oil Shutdown No
Ignition System Magnetron
Governor System Mechanical
Carburetor Float type
Throttle Control Fixed speed
Choke Control No
Max. RPM 3,200
Charging System Amps None
Muffler Included Yes
Flywheel Brake CPSC blade brake
Auto Compression Release Yes
Bolt Circle (in.) 8
Dimensions L x W x H (in.) 16 x 12 1/2 x 13
EPA/CARB Approval (California Air Resource Board) Yes
Product Weight (lbs.) 24

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 OHV Lawn Mower Engine  — 163cc, 7/8in. x 3 5/32in. Shaft, Model# 104M02-0021-F1 The price is $169.99.
Briggs & Stratton OHV Lawn Mower Engine — 163cc, 7/8in. x 3 5/32in. Shaft, Model# 104M02-0021-F1
4.5 / 5 (2)
Item# 54969
In Stock Online
Only $169.99
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Factory Shipped —
Estimated Delivery: 4 - 6 Business Days
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4.8 / 5 (4)
Item# 750061
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Estimated Delivery: 4 - 6 Business Days
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4 / 5 (6)
Item# 70507
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Estimated Delivery: 4 - 6 Business Days
Only $289.99
4.5 / 5 (8)
Item# 172794
Factory Shipped —
Estimated Delivery: 4 - 6 Business Days
Only $339.99
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 - - - -