25HP, V-Twin Commercial Electric Start, Has Fuel Pump. Briggs & Stratton Commercial ELECTRIC START. These engines are specially designed for zero turn mowers and other high debris applications to endure extended use in extreme conditions. Bore 3.12 in. Stroke 2.89 in. Oil Capacity 64 fl. 16A Alternator w Regulator. MUFFLER IS NOT INCLUDED. Crankshaft, Drilled and Tapped 7/16-20 1/4-Sq. Keyway 3-5/32 Crank Length. Mechanical compression release for easy, reliable starting. Chrome plated exhaust valves reduce valve wear. Premium high capacity air, oil and fuel filters. Provide longer maintenance intervals and more. Super-finished crank pin bearing for reduced. Advanced Debris Management System with a dual. Seal, cartridge-style air filter provides maximum. Protection and extends engine life. Briggs and Stratton Dealer.