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Briggs & Stratton Engine 44S977-0033-G1 25 hp 1 1/8" 724cc


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25 hp, Briggs & Stratton Vertical Shaft Engine, 44S977-0033-G1, 724cc, Crankshaft 1 1/8" x 4 19/64", Tapped 7/16-20, 1/4" Keyway, Free Shipping, No Tax.

Replaces Old  Briggs & Stratton Models: 40H777-0124-G1, 40H777-0241-E1, 445677-0476-E1, 445677-0759-E1, 445777-0231-E1, 446677-0127-B1, 446777-0244-E1, 446877-0121-E1, 44M777-0128-B1, 44P777-0110-E1, 44P777-0115-E1, 44P777-0137-G1, 44P777-0156-G1, 44P777-2156-G1, 44P777-0128-G1, 44P777-0133-G1, 44P777-2157-G1, 44Q777-0136-G1, 44Q777-0149-G5, 44Q777-1039-B1, 44Q777-3136-G5, 44S877-0001-G1, Toro 74704

  • Scag STC48V-26BS, F4000001 & Higher, # 484228
  • Scag STC48V-26BS, E4800001 - E4899999, #483875
  • Scag STC48V-26BS, D6500001 - D6599999, #483439
  • Scag SFZ48-26BS, SFZ52-26BS, D8500001 - D8799999, #483874
  • Scag SFZ48-26BS, SFZ52-26BS, F3300001 & Higher, #484223

This genuine 724cc Briggs & Stratton twin cylinder engine offers dependable power for your equipment needs. With a power rating of 25 horsepower, this engine features a premium Dual Clean air filtration system, electric starter, and maintenance-free Magnetron electronic ignition. With a manufacturer limited warranty of 2 years consumer use / 1 year commercial use, Briggs & Stratton provides power that you can trust. This engine includes a Dura-Bore cast iron cylinder sleeve for extended life, fuel pump, oil filter and a 16 amp charging system.

To convert this enigne to a manual choke add, 1 x 691022 link rod, 1 x 691021 bracket, 2 x 695239 screws unless the engine you are replacing has these parts on it.

Application Riding Lawn Mower
Air Cleaner Type Pleated Paper With Foam Pre-Cleaner
Auto Compression Release Yes  
Bearing Type (PTO Side) DU  
Auxilary PTO No  
Bolt Circle (in.) 10  
Package Dimensions Height (in) 21.5  
Part Dimensions Length (in) 19  
Part Dimensions Width (in) 16  
Part Dimensions Height (in) 18  
Single UPC 047282017555
Country of Origin US  
Max. RPM 3300  
Muffler Included No  
Ship Weight (lbs.) 120.7  
Oil Capacity (oz.) 64  
Start Type Electric  
Throttle Control Remote  
Governor System Mechanical
Ignition System Electronic
Low Oil Alert No  
Low Oil Shutdown No  
Limited Warranty 2 Years Consumer, 1 Year Commercial
Lubrication System Pressure   
Flywheel Brake No  
Flywheel Type Heavy  
Fuel Filter Yes  
Fuel Pump Yes  
Fuel Tank Included No  
Fuel Type Gasoline  
Crankshaft Rotation (From PTO Shaft Side) Counter Clockwise
Cylinder Bore Type Cast Iron Sleeve
Cylinders (qty.) 2  
Engine Displacement 724cc  
Engine Series Intek  
EPA/CARB Approval (California Air Resource Board) Yes  
Cooling System Air  
Crankshaft Straight  
Crankshaft Diameter (in.) 1-1/8  
Crankshaft End Tapped Size 7/16-20  
Crankshaft Length (in.) 4-5/16  
Crankshaft Output Vertical  
Bore x Stroke (in.) 3.12 x 2.89
Carbureted Yes  
Carburetor Float  
Charging System 16 Amp Regulated
Choke Control Choke-A-Matic (Auto Choke)

Service Notes - These modifications below may need to be made to match your engine. 

  • Transfer Remote Choke Control Assembly from original engine to replacement engine. (or leave as is, for use as auto choke system)
  • This engine is equipped with a Six Pin Wiring Harness.
  • Original engine was equipped special Remote Throttle Control or Governor Control. Transfer these parts to replacement engine.
  • Transfer Oil Sensor to the replacement engine.


  • Model: 44S977-0033-G1
  • UPC: 047282113615
  • Shipping Weight: 84lbs
  • Manufactured by: Briggs-Stratton

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