Briggs and Stratton 350777 - 1159 18hp
18 HP Vertical Shaft Vanguard Series small engine
2yr Factory Warranty 

• V - Twin 
• Cast Iron Cylinder Sleeve
• 12 Volt Electric start, 16 amp alternator
• 1" dia. x 3.19" crankshaft drilled/tapped 7/16-20
• Has oil pump and oil filter
• Oil Gard ® low oil engine shut down
• Extended oil dipstick
• Remote throttle & choke
• Has fuel pump
• Dual element air cleaner
• aNo Gas TankaNo Muffler You would normally use these parts from your existing mower

Note: The charging system on this engine was designed for John Deere. The voltage regulator has an extra orange wire that must be connected to the accessory terminal of the keyswitch. This voltage regulator needs to have 12 volts from the battery only in the "on" position of the keyswitch to allow the regulator to monitor the battery voltage and better regulate the charge rate. However, this connection needs to be broken in the "off" position when the engine is not running so it does not run the battery down. Connect the Red wire to the battery to "charge" and the orange from the keyswitch to "activate" the regulator. Tan wire is for a charge indicator light, (3-watt)

Link to Briggs 350777 Owners Manual