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331977-0001-G1Horsepower 21
Crankshaft Orientation: Vertical Shaft
Single Cylinder
Cylinder Type: Cast Iron Sleeve
Cylinder Head Style: OHV
Crankshaft Diameter: 1 inch
Crankshaft Length: 3-5/32 inches
1/4" key way
drilled/tapped 7/16-20 bolt
Gear Reduction: No
Charging System: 9 Amp DC
Cooling System: Air Cooled
Lubrication Type: Pressurized
Oil Sensor: No
Oil Filter: Yes
Muffler: Yes
(standard side mount, 697349 included)
Starter Type: 12 Vt. Electric
Fuel Tank: No
Fuel Pump: Yes
Throttle Controls: Remote for cable (standard lawnmower)
Engine Weight: 90
Replacement for 331877-3036
Engine Features:
Extended Life Series - Dura-Bore cast iron cylinder sleeve for extended life
Dependable float carburetor for consistent easy starting
Maintenance-free Magnetron electronic ignition for quick, dependable starts
Premium air cleaner has three times the cleaning capacity for superior protection
Full pressure lubrication with premium spin-on oil filter assures controlled lubrication for extended component life
Overhead valve design (OHV) for cooler operation and longer valve life
Platinum spark plugs for extended life
Patented linear balancing system provides smoother performance
Buyer protection package provides two-year consumer engine warranty
Engine Applications:
Riding Mower Applications
Sales Notes:
New Improved Air CleanerChoke-A-Matic Carb *
Ground Wire Terminal
Status: Current Production
Click here for a .pdf line drawing.
Briggs & Stratton suggests that this engine is a suitable replacement for the following engine models:
31M877-0110-E1, 31M977-0111-E1, 31M977-0112-E1, 31M977-0114-E1, 31N607-0765-B1, 31N677-0554-B2, 31N807-0440-E1, 31P677-0113-B1, 31P677-0113-E1, 31P677-0113-G1, 31P677-0116-B1, 31P677-0117-B1, 31P677-0117-G1, 31P677-0130-B1, 31P677-0130-E1, 31P677-0130-E2, 31P677-0131-B1, 31P677-0131-B2, 31P677-0132-B1, 31P677-0132-B2, 31P677-0133-B1, 31P677-0133-B2, 31P677-0134-G1, 31P677-0134-G2, 31P677-0138-B1, 31P677-0140-B1, 31P677-0140-B2, 31P677-0141-G1, 31P677-0141-G2, 31P677-0143-B1, 31P677-0143-B2, 31P677-0494-B1, 31P677-0494-E1, 31P677-0804-B1, 31P677-0804-B2, 31P677-0804-E1, 31P677-0804-G1, 31P677-0832-B1, 31P677-0832-B2, 31P877-0036-E1, 31P877-0110-E1, 31P877-0110-E2, 31P877-0118-E1, 31P877-0118-E2, 31P877-0121-E1, 31P877-0122-B1, 31P877-0608-E1, 31P877-0608-E2, 31P977-0036-E1, 31P977-0036-G1, 31P977-0449-E1, 31P977-0575-E1, 31P977-0575-E2, 31P977-0635-E1, 31P977-0652-B1, 31P977-0670-E1, 31P977-0671-E1, 31P977-0881-B1, 31P977-1046-B1, 31P977-1066-E1, 31P977-1094-B1, 31Q677-0111-B1, 31Q677-0111-E1, 331777-0546-B1, 331777-0546-E1, 331777-0946-B1, 331777-0946-B2, 331777-0946-B4, 331777-0946-G1, 331777-0956-B1, 331777-1107-B1, 331777-1192-B1, 331877-0036-E1, 331877-0036-G1, 331877-0113-B1, 331877-0113-B2, 331877-0114-G1, 331877-0114-G2, 331877-0115-B1, 331877-0117-G1, 331877-0142-B1, 331877-0142-B2, 331877-0143-G1, 331877-0143-G2, 331877-0144-B1, 331877-0145-B1, 331877-0730-B1, 331877-0805-B1, 331877-0805-E1, 331877-0979-B1, 331877-1234-B1 among other engines.
Also note that some engines may require use of old engine parts or items supplied by the OEM to correctly interchange.
If you would like for us to verify the application as shown or to check for availability on your original engine model, please contact our sales staff for assistance.