Bore Strokes and Mechanical Specs. The Briggs and Stratton 8 horsepower engine is a single cylinder, L-head style engine with a cast iron sleeve lining the aluminum cylinder bore area for maximum engine life. The engine has a bore of 3.12 inches and a stroke, or maximum movement of the piston, of 2.43 inches. The displacement of this engine is Briggs and Stratton Vertical Engine 19 HP 540cc 1" x 3-5/32" #33R877-0029. Cast iron cylinder sleeve and dual element air filter for extended engine life. Patented linear balancing system provides smoother performance. 9 amp/electric start only. Includes muffler. 1" x 3-5/32" shaft, tapped 7/16" with 1/4" keyway. Hello - I have a Toro modedl 20331 lawn mower with a Briggs and Stratton model 124T02-0203-B1 engine. The engine was run dry at one point and the connecting rod failed damaging the block. A new engine … read more The best value choice. The 500E Series™ engine is compact, lightweight and simple to operate - with reduced vibration, quieter operation and enhanced handling. Excellent engines to count on, to get the job done. Find a Dealer. I have a Lawn chief 520, with a Briggs and Stratton model(NNN) NNN-NNNN01 engine, built 1991. Runs fine. The original muffler is round, held to the engine by 2 long screws through the heat guard. The … read more The Briggs and Stratton 31H777 Intek is a 501 cc, (30.6 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Briggs & Stratton for general-purpose applications. A 90.6 mm (3.57 in) cylinder bore and 77.8 mm (3.06 in) piston stroke give the B&S 31H777 Briggs & Stratton 148cc 475 Series™ Horizontal Engine produces 4.75 ft.-lbs. Gross Torque to get the job done. Entry market engine is value-engineered for basic needs. This engine has responsive power and reliable performance. U.S.A. Not for sale in California. Customers are responsible for checking local codes and regulations prior to purchase. 8 posts · Joined 2013. #7 · Apr 1, 2013. pugs said: One easy comparison is size. The briggs is a 724cc engine while the Kawasaki is 726cc. I would probably go with the Kawasaki. 3 Year commercial use warranty vs 1 year commercial use for the Briggs. The FS is the same as the FX series for the block, pistons, heads. EwQv0.