Briggs and Stratton Twin Cylinder OHV Air Cooled Engine

GENERAL INFORMATION Section 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IGNITION Section 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CARBURETION Section 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOVERNOR CONTROLS & GOVERNOR Section 4 . . . . . . . . . . . . . . . . . . . . . . . . CYLINDER HEAD & VALVES Section 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ELECTRIC STARTER Section 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALTERNATORS Section 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LUBRICATION Section 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINE DISASSEMBLY Section 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CYLINDER & CRANKCASE COVER INSPECTION & REPAIR Section 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CRANKSHAFT & CAMSHAFT Section 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PISTON, RINGS & CONNECTING ROD INSPECTION & ASSEMBLY Section 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINE ASSEMBLY Section 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLE OF CONTENTS (For Section Reference, See Pages II through IV.) I For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

SECTION REFERENCE SECTION (By Subject) II Air Cleaner 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance Air Guides 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation Alternators 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Identification Test Equipment Testing Output Troubleshooting Anti-Afterfire Solenoid 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Armature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Gap Installation/Removal Testing (Also See Check Ignition) 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cables Charging Checking Recommendation (Also See Checking Battery) 7C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bearings 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking Installation/Removal Breather 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking Installation/Removal Camshaft Checking 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburetor 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustment Anti-Afterfire System Assembly/Disassembly Remove Carburetor Controls 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charging System (See Alternators) 7C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coils (See Armature ) 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compression Testing 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connecting Rod Checking 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crankcase Cover Checking 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crankshaft Checking 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . End Play 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation/Removal 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION REFERENCE (Continued) SECTION III Cylinder Head 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cylinder 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bearings Resizing Bore Cylinder Balance Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cylinder Leakdown Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Identification System 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Specifications Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust System − Supplied By Equipment Manufacturer Flywheel 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation/Removal (Also See Flywheel Identification) 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Filter 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Recommendations 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Pump 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Information 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Governor 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustment Governed Idle (Also See Governed Idle Adjustment) 3, 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ground Wire Harness 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignition 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications (Also See Check Ignition) 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Keyswitch − Testing 2, 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance Schedule 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Muffler − Supplied By Equipment Manufacturer Oil Drain 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Fill 1, 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Filter 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Pressure Switch 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Pump 4, 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Recommendations 1, 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Seal 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piston 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piston Rings 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly/Removal Checking Pressure Lube 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Regulator/Rectifier 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION REFERENCE (Continued) SECTION IV Remote Controls 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustment Governed Idle Wire Travel Spark Plug 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Speed Control Adjustment 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starters, Electric 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assemble/Disassemble Starter Assemble/Disassemble Starter Drive Keyswitch − Testing Replace Brushes Test Equipment Testing Troubleshooting Stop Switch (See Ground Wire Harness) 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fastener And Torque Specifications 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Valves 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust Valve Clearances Refacing Seals Seats Valves − Installation/Removal

V English to Metric Conversion Table Fraction Decimal mm Fraction Decimal mm 1/64 0.0156 0.3969 33/64 0.5156 13.0969 1/32 0.0312 0.7938 17/32 0.5312 13.4938 3/64 0.0469 1.1906 35/64 05469 13.8906 1/16 0.0625 1.5875 9/16 0.5625 14.2875 5/64 0.0781 1.9844 37/64 0.5781 14.6844 3/32 0.0938 2.3812 19/32 0.5938 15.0812 7/64 0.1094 2.7781 39/64 0.6094 15.4781 1/8 0.1250 3.1750 5/8 0.6250 15.8750 9/64 0.1406 3.5719 41/64 0.6406 16.2719 5/32 0.1562 3.9688 21/32 0.6562 16.6688 11/64 0.1719 4.3656 43/64 0.6719 17.0656 3/16 0.1875 4.7625 11/16 0.6875 17.4625 13/64 0.2031 5.1594 45/64 0.7031 17.8594 7/32 0.2188 5.5562 23/32 0.7188 18.2562 15/64 0.2344 5.9531 47/64 0.7344 18.6531 1/4 0.2500 6.3500 3/4 0.7500 19.0500 17/64 0.2656 6.7469 49/64 0.7656 19.4469 9/32 0.2812 7.1438 25/32 0.7812 19.8438 19/64 0.2969 7.5406 51/64 0.7969 20.2406 5/16 0.3125 7.9375 13/16 0.8125 20.6375 21/64 0.3281 8.3344 53/64 0.8281 21.0344 11/32 0.3438 8.7312 27/32 0.8438 21.4312 23/64 0.3594 9.1281 55/64 0.8594 21.8281 3/8 0.3750 9.5250 7/8 0.8750 22.2250 25/64 0.3906 9.9219 57/64 0.8906 22.6219 13/32 0.4062 10.3188 29/32 0.9062 23.0188 27/64 0.4219 10.7156 59/64 0.9219 23.4156 7/16 0.4375 11.1125 15/16 0.9375 23.8125 29/64 0.4531 11.5094 61/64 0.9531 24.2094 15/32 0.4688 11.9062 31/32 0.9688 24.6062 31/64 0.4844 12.3031 63/64 0.9844 25.0031 1/2 0.5000 12.7000 1 1.0000 25.4000

VI Drill Size − Decimal Equivalent In Inches 60 .040 59 .041 58 .042 57 .043 56 .0465 55 .052 54 .055 53 .0595 1/16 .0625 52 .0635 51 .067 50 .070 49 .073 48 .076 5/64 .0781 47 .0785 46 .081 45 .082 44 .086 43 .089 42 .0935 3/32 .0938 41 .096 40 .098 39 .0995 38 .1015 37 .104 36 .1065 7/64 .1094 35 .110 34 .111 33 .113 32 .116 31 .120 1/8 .125 30 .1285 29 .136 28 .1405 9/64 .1406 27 .144 26 .147 25 .1495 24 .152 23 .154 5/32 .1562 22 .157 21 .159 20 .161 19 .166 18 .1695 11/64 .1719 17 .173 16 .177 15 .180 14 .182 13 .185 3/16 .1875 12 .189 11 .191 10 .1935 9 .196 8 .199 7 .201 13/64 .2031 6 .204 5 .2055 4 .209 3 .213 7/32 .2188 2 .221 1 .228 A .234 15/64 .2344 B .238 C .242 D .246 E, 1/4 .250 F .257 G .261 17/64 .2656 H .266 I .272 J .277 K .281 9/32 .2812 L .290 M .295 19/64 .2969 N .302 5/16 .3125 O .316 P .323 21/64 .3281 Q .332 R .339 11/32 .3438 S .348 T .358 23/64 .3594 U .368 3/8 .375 V .377 W .386 25/64 .3906 X .397 Y .404 13/32 .4062 Z .413 27/64 .4219 7/16 .4375 29/64 .4531 15/32 .4688 31/64 .4844 1/2 .500

9905 1 Section 1 GENERAL INFORMATION Page IN THE INTEREST OF SAFETY 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAINTENANCE Maintenance Schedule 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel And Oil Recommendations 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change Oil 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change Oil Filter 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean Cooling System 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace Spark Plugs 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Cleaner Maintenance 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remove Combustion Chamber Deposits 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TROUBLESHOOTING Systematic Check 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Ignition (With Electric Starter) 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Ignition (Engine Running) 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking For Fouled Spark Plug 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Carburetion 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Compression 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cylinder Leakdown Test 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cylinder Balance Test 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Affecting Engine Operation 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FASTENER SPECIFICATIONS 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . COMMON SPECIFICATIONS 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STANDARD AND REJECT DIMENSIONS 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section Contents

2 In the Interest of Safety This safety alert symbol indicates that this message involves personal safety. Words danger, warning and caution indicate degree of hazard. Death, personal injury and/or property damage may occur unless instructions are followed carefully. You are not ready to operate this engine if you have not read and understood the following safety items. Read this entire owner’s manual and the operating instructions of the equipment this engine powers. The Briggs & Stratton engine is made of the finest material in a state-of-the-art manufacturing facility. Please understand that Briggs & Stratton sells engines to original equipment manufacturers. It also sells to others in the distribution chain who may sell to the ultimate consumer, an equipment manufacturer, another distributor or a dealer. As a result, Briggs & Stratton does not necessarily know the ap- plication on which the engine will be placed. For that reason, carefully read and understand the operating instructions of the equipment before you repair or operate it. You should also understand that there are equipment applications for which Briggs & Stratton does not approve the use of its engines. Briggs & Stratton engines are not to be used on vehicles with less than 4 wheels. They include motor bikes, aircraft products and All Terrain Vehicles. Moreover, Briggs & Stratton does not approve of its engines being used in competitive events. F0R THAT REASON, BRIGGS & STRATTON ENGINES ARE NOT AUTHORIZED FOR ANY OF THESE APPLICATIONS. Failure to follow this warning could result in death, serious injury (including paralysis) or property damage. DO NOT run engine in an enclosed area. (Exhaust gases contain carbon monoxide, an odorless and deadly poison.) DO NOT remove fuel tank cap nor fill fuel tank while engine is hot or running. DO NOT refuel indoors or in an unventilated area. (Allow engine to cool 2 minutes before refueling.) DO NOT place hands or feet near moving or rotating parts. DO NOT store, spill, or use gasoline near an open flame, nor near an appliance like a stove, furnace, or water heater that uses a pilot light or can create a spark. DO NOT refuel indoors or in an unventilated area. DO NOT operate or tip engine/equipment at such a severe angle that causes gasoline spillage. DO NOT operate engine if gasoline is spilled or when smell of gasoline is present or other explosive conditions exist. (Move equipment away from spill and avoid any ignition until gasoline has evaporated.) DO NOT transport engine with fuel in tank or fuel shut-off valve open. DO NOT choke carburetor to stop engine, especially in an enclosed vehicle. (Whenever possible, gradually reduce engine speed before stopping.) DO NOT tamper with governor springs, links or other parts to increase engine speed. (Run engine at speed set for equipment manufacturer.) DO NOT check for spark with spark plug removed. (Use an approved tester.) DO NOT run engine without blower housing or other safety shields removed when doing repairs. DO NOT crank engine with spark plug removed. (If engine is flooded, place throttle in FAST and crank until engine starts.) DO NOT strike flywheel with a hammer or hard object as this may cause flywheel to shatter in operation. (To remove flywheel, use Briggs & Stratton approved tools and proceed- ures only.) DO NOT operate engine without a muffler. (Inspect periodically and replace if worn or leaking. If engine is equipped with muffler deflector, inspect periodically and replace if necessary. Replacement parts must be same as on original equipment.) DO NOT operate engine with an accumulation of grass, leaves or other combustible material in muffler area. DO NOT use this engine on any forest covered, brush covered, or grass covered unimproved land unless a spark arrester is installed on muffler. The spark arrester must be maintained in working order by the owner and/or operator. In the State of California the above is required by law (Sec- tion 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. DO NOT touch hot muffler, cylinder, or fins which can cause burns. DO NOT start engine with air cleaner or air cleaner cover removed (or cover over carburetor air intake, if Sno/Gard engine). DO NOT attempt to start engine with cutting blade loose or removed. (Blade must be tight, otherwise a kickback may occur.) 4Prior to work, read and understand the section(s) of this manual that pertain to the job. Follow all safety warnings. 4PULL starter cord slowly until resistance is felt. Then pull cord rapidly to avoid kickback and prevent hand or arm injury. 4WEAR suitable eye protection (safety glasses, goggles or face shield when performing repair procedures). 4 PREVENT ACCIDENTAL STARTING by removing spark plug wire from spark plug when servicing engine or equipment. Dis- connect negative wire from battery terminal if equipped with electric starting system. 4 REMOVE blower housing periodically and clean engine. Keep cylinder fins and governor parts free of dirt, grass and other debris which can affect engine speed. 4 USE fresh gasoline. Stale fuel can gum carburetor and cause leakage. 4 CHECK fuel lines and fittings frequently for cracks or leaks. Replace if necessary. 4 USE ONLY Genuine Briggs & Stratton Parts or their equivalent. The use of replacement parts which are not of equivalent quality may damage the engine. WARNING: The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

3 BRIGGS & STRATTON NUMERICAL NUMBER SYSTEM All Briggs & Stratton engines have a unique numerical designation system. Each engine is identified by a Model, Type and Code number. Example: Model Type Code 405777 0125 01 99052115 This chart explains the numerical model designation system. It is possible to determine most of the important mechanical features of the engine by merely knowing the model number. Here is how it works. FIRST DIGIT AFTER DISPLACEMENT SECOND DIGIT AFTER DISPLACEMENT THIRD DIGIT AFTER DISPLACEMENT FOURTH DIGIT AFTER DISPLACEMENT CUBIC INCH DISPLACEMENT BASIC DESIGN SERIES CRANKSHAFT, CARBURETOR,  GOVERNOR PTO BEARING, REDUCTION GEAR, AUXILIARY DRIVE, LUBRICATION TYPE OF STARTER 6 8 9 10 11 12 13 16 17 18 19 20 22 23 24 25 26 28 29 30 31 32 35 38 40 42 43 44 46 52 58 0 1 2 3 4 5 6 7 8 9 A to Z 0 − Horizontal Shaft Diaphragm Carburetor Pneumatic Governor 1 − Horizontal Shaft Vacu-Jet Carburetor Pneumatic Governor 2 − Horizontal Shaft Pulsa-Jet Carburetor Pneumatic or Mechanical Governor 3 − Horizontal Shaft Flo-Jet Carburetor Pneumatic Governor 4 − Horizontal Shaft Flo-Jet Carburetor Mechanical Governor 5 − Vertical Shaft Vacu-Jet Carburetor Pneumatic or Mechanical Governor 6 − Vertical Shaft 7 − Vertical Shaft Flo-Jet Carburetor Pneumatic or Mechanical Governor 8 − Vertical Shaft Flo-Jet Carburetor Mechanical Governor 9 − Vertical Shaft Pulsa-Jet Carburetor Pneumatic or Mechanical Governor 0 − Plain Bearing/DU Non-Flange Mount 1 − Plain Bearing Flange Mounting 2 − Sleeve Bearing Flange Mounting Splash Lube 3 − Ball Bearing Flange Mounting Splash Lube 4 − Ball Bearing Flange Mounting Pressure Lubrication on Horizontal Shaft 5 − Plain Bearing Gear Reduction (6 to 1) CW Rotation Flange Mounting 6 − Plain Bearing Gear Reduction (6 to 1) CCW Rotation 7 − Plain Bearing Pressure Lubrication on Vertical Shaft 8 − Plain Bearing Auxiliary Drive (PTO) Perpendicular to Crankshaft 9 − Plain Bearing Auxiliary Drive Parallel to Crankshaft 0 − Without Starter 1 − Rope Starter 2 − Rewind Starter 3 − Electric Starter Only 120 Volt Gear Drive 4 − Electric Starter/Generator 12 Volt Belt Drive 5 − Electric Starter Only 12 Volt Gear Drive 6 − Alternator Only 7 − Electric Starter 12 Volt Gear Drive With Alternator 8 − Vertical Pull Starter or Side Pull Starter 9 − Mechanical Starter The type number identifies certain unique features such as the crankshaft or governed speed used on an engine. The code number identifies the assembly date of the engine. In some instances it is necessary to know the code number as well as the model and type number when performing adjustments, repairs or ordering replacement parts for an engine. Here is how it works. Example: 99052115 A. The first two digits, 99, indicate the calendar year, 1999. B. The second two digits, 05, indicate the calendar month, May. C. The third two digits, 21, indicate the calendar month day. D. The last two digits, 15, indicate the assembly line or manufacturing plant.

4 MAINTENANCE Maintenance Schedule 5 Hours or Daily 25 Hours or Every Season 50 Hours or Every Season 100 Hours or Every Season 500 Hours Check oil level♦ D Change oil D Note 1 Change oil filter D Note 1 Change air cleaner pre-cleaner D Note 2 Change air cleaner cartridge D Note 2 Clean cooling system D Note 2 * Inspect/clean spark arrester (optional accessory) D Replace spark plugs D Replace in-line fuel filter D Remove combustion chamber deposits D ♦ Change oil after first 8 hours, then after every 50 hours or every season. * Exhaust system supplied by equipment manufacturer. Note 1 Change oil every 25 hours when operating under heavy load or in high temperatures. Note 2 Clean more often under dusty conditions or when airborne debris is present. Replace air cleaner parts, if very dirty. FUEL AND OIL RECOMMENDATIONS Gasoline We recommend the use of clean, fresh, lead-free gasoline, and the use of BRIGGS & STRATTON GASOLINE ADDITIVE, PART #5041. Leaded gasoline may be used if it is commercially available and if lead-free is not available. A minimum of 85 octane is recommended. The use of lead-free gasoline results in fewer combustion deposits and longer valve life. NOTE: Some fuels, called oxygenated or reformulated gasolines, are gasolines blended with alcohols or ethers. Excessive amounts of these blends can damage the fuel system or cause performance problems. Do not use gasoline which contains Methanol. If any undesirable operating symptoms occur, use gasoline with a lower percentage of alcohol or ether. We also recommend gasoline be purchased in small quantities, not more than a 30 day supply. FRESH gasoline minimizes gum deposits, and also will ensure fuel volatility tailored for the season in which the engine will be operated. Lubrication Oil has four purposes. It cools, cleans, seals and lubri- cates. During normal operation, small particles of metal from the cylinder walls, pistons, bearings and combustion deposits will gradually contaminate the oil. Dust particles from the air also contaminate the oil forming an abrasive mixture which can cause wear to all of the internal moving parts of the engine, if the oil is not changed regularly. Fresh oil also assists in cooling. Old oil gradually becomes thick and loses its cooling ability as well as its lubricating qualities. Briggs & Stratton Intek™ OHV V-Twin engines are lubri- cated with a gear-driven oil pump. Oil Recommendations We recommend the use of a high quality detergent oil classified “For Service SE, SF, or SG” such as Briggs & Stratton 30 Weight Oil Part #100005 or #100028. Deter- gent oils keep the engine cleaner and retard the formation of gum and varnish deposits. No special additives should be used with recommended oils. Change Oil The crankcase capacity of Intek™ OHV V-Twin cylinder engines is approximately: 4 Pints (1.9 liters) with filter 3-3/4 Pints (1.8 liters) without filter RECOMMENDED SAE VISCOSITY GRADES 4-Cycle Intek™ V-Twin OHV Gasoline Engines °F -20 0 20 40 60 80 100 °C -30 -20 -10 0 10 20 30 40 TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE * ** 32 * Air cooled engines run hotter than automotive engines. Use of multi-viscosity oils (10W-30, etc.) above 4° C (40° F) will result in high oil consumption and possible engine damage. Check oil level more frequently if using these types of oils. ** SAE 30 oil, if used below 4° C (40° F), will result in hard starting and possible engine bore damage due to inadequate lubrication.

Briggs and Stratton Twin Cylinder OHV Air Cooled Engine

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