Briggs & Stratton 31R907-0006-G1 17.5HP 500cc Engine – 1in Shaft, Electric Start

Description

Prevent deck vibration and premature belt slip using the Briggs & Stratton 31R907-0006-G1 vertical shaft engine on commercial lawn tractors and mowers. Heavy turf maintenance operations crack weak engine mount castings and bend undersized drive shafts during rough terrain transitions. This 500cc 17.5HP engine features a 1-inch output shaft and a reinforced mounting flange engineered to absorb severe deck stress.

Piston ring blow-by and oil consumption degrade cutting performance when utility engines run hot all afternoon. This engine uses a cast-iron bore sleeve and overhead valve architecture that dissipates heat into the cooling airstream before oil thins out. The dual-stage filtration system stops fine silica particles at the airbox, ensuring clean intake airflow across continuous 8-hour operating schedules.

Key Engineering Features of Briggs & Stratton 31R907-0006-G1

• 500cc Commercial OHV Powerhead: Produces 17.5 rated horsepower to maintain high blade tip speed under heavy cutting loads.
• 1-Inch Vertical PTO Drive Shaft: Bolts straight into commercial mower blade clutches and hydrostatic transaxles.
• Cast-Iron Cylinder Bore Sleeve: Extends engine service life by maintaining piston ring seal in dusty cutting environments.
• 12V Solenoid Shift Electric Starter: Delivers fast key-turn starts that eliminate operator pull-cord fatigue.
• Dual-Stage Pleated Air Filter: Blocks fine debris with an oiled foam pre-wrap over an automotive paper element.
• Cast-Iron Crankcase Flange Base: Resists cracking and bolt loosening caused by continuous deck vibration.
• Aluminized Low-Noise Muffler: Controls exhaust decibels to meet municipal sound ordinances in suburban zones.
• Mechanical Flywheel Governor: Stabilizes engine RPM automatically when cutting blades enter heavy, wet grass.

Fleet Productivity & Cost of Ownership

Engineered for high-torque commercial mowing, this powerplant combines heavy cast metallurgy with maintenance-reducing features.

• Heavy cast iron cylinder lining and thick crankcase casting prevent thermal distortion during heat waves.
• Electric key starting saves morning start time while improved fuel efficiency cuts seasonal operation costs.
• Commercial turf maintenance fleets and golf course maintenance crews avoid costly chassis modification delays.

Chassis Compatibility & Repower Mounting

With an overall dry weight of 65 pounds and a 1-inch vertical PTO shaft, this unit repowers commercial lawn tractors, wide-area turf equipment, and heavy-duty lawn vacuums.

Factory Warranty & Maintenance Guidelines

• Commercial fleet operators receive 2-Years of limited factory warranty coverage against component defects.
• Residential and estate owners receive 2-Years of complete consumer warranty protection.

Change oil after the initial 20 operating hours, then service every 50 hours using 10W-30 commercial engine oil. Clean the foam pre-filter weekly in dusty turf conditions, and check the spark plug gap at 0.030 inches. Order the Briggs & Stratton 31R907-0006-G1 vertical shaft engine from Mulmotor.com for guaranteed factory-fresh units, complete manufacturer warranty coverage, and dedicated commercial equipment support.