ADVANCE PRODUCT
SERVICE INFORMATION
INFORMATION BULLETIN NO. 42 DATE: 7-03-2003
SUBJECT: 31 HP Air Cooled V-Twin Engine FILE IN: 272144
Introducing the new Briggs & Stratton Vanguardt 31 HP, V-Twin OHV Engine, Model Series 540000. This is the
largest 2-cylinder air cooled engine Briggs & Stratton has ever produced, delivering horsepower and torque numbers
rivaling the best 2-cylinder liquid cooled engines but in a lighter, less expensive, easier to maintain package. It
features full pressure lubrication, a Donaldson 2 Stage Cyclonic air cleaner, a Super Lo-Tone muffler system, and
the new Advanced Debris Management Systemt. A full two year commercial-use warranty applies. The following
preliminary service specifications are subject to change.
Vanguard Model Series 540000
Air Filter - Primary (Outer)
Common Maintenance Parts
809670
Air Filter - Safety (Inner)
Fuel Filter
Fuel Stabilizer (4.2 oz.)
Oil - 4-Cycle 30W (48 oz.)
Oil Filter
Oil Pump Kit (Removes Oil From Engine)
Spark Plug
Spark Plug Wrench
Spark Tester
821136
691035 or 5065D
100002 or 5041D
Oil - 4-Cycle 5W-30 Synthetic (32 oz.)
100028
100074
492932s or 5049D
5056D
692051
89838 or 5067D
19368
Common Specifications
Air Cleaner Type 2 Stage Cyclonic
Alternator Output &Type 20 Amp - Regulated
Armature Air Gap 0.005 - 0.007” (0.13 - 0.18 mm)
Bore 3.366” (85.5 mm)
Bore Type Cast Iron Sleeve
Compression Ratio 8.25:1
Crankshaft End Play .002 - .012” (.05 - .30 mm)
Displacement 54 ci. (895 cc)
Fuel Filter Type Spin-On Cartridge
Governor System Mechanical
Lubrication System Full Pressure
Maximum Horsepower @ 3600 PRM 31
Maximum Torque @ 2400 RPM 47 ft-lbs.
Muffler System 5” Round - Single Outlet
Oil Capacity - with Filter 79 oz. (2.3 L)
Oil Capacity - without Filter 71 oz. (2.1 L)
Oil Fill Style In Valve Cover
Spark Plug Gap 0.020” (0.51 mm)
Stroke 3.071” (78.0 mm)
Timing Setting 23° BTDC
Valve Clearance (Cold) - Int. and Exh. 0.004 - 0.006” (0.10 - 0.15 mm)
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