Title: Briggs & Stratton 4-Stroke Overhead Valve from 1988
Description: TABLE OF CONTENTS

1- DESCRIPTION & OPERATION 

FOUR-STROKE ENGINE OPERATION            1-1

COOLING            1-4

ENGINE "BUILD-UP" COMPONENTS        1-4

MODEL NUMBER GUIDE            1-5

ENGINE IDENTIFICATION     1-6

 

2- TROUBLESHOOTING

PROCEDURES          2-1

ENGINE CHECKOUT            2-2

FLOW CHART INDEX            2-4

Chart #1                Eng. fails to start                2-5

Chart #2 Crankshaft fails to rotate hand starter     2-8

Chart #3 Crankshaft fails to rotate elec. cranking mtr. 2-9 

Chart #4 Engine lacks pwr. 2-10 

Chart #5 Engine skips or misses    2-13

Chart #6 Engine vibrates                2-15

Chart #7 Engine knocks or is noisy 2-18 

Chart #8 Engine overheats 2-23 

Chart #9 Engine idles poorly 2-26 

Chart #10 -- Engine stalls on acceleration                2-27

Chart #11 Engine surges    2-31

Chart #12 Carburetor requires adjustment                2-35

Chart #13 -- Ignition system inoperative                2-38

 

3- TUNING

INTRODUCTION      3-1

TUNE-UP SEQUENCE            3-1

SPARK PLUG EVALUATION         3-2

SERVICE AIR CLEANER            3-3

THROTTLE, CHOKE, GOVERNOR LINKAGE            3-4

SERVICE BATTERY            3-6

CLEAN COOLING FINS   3-7

COMPRESSION TEST            3-8

CHECK IGNITION SYSTEM            3-8

SERVICE FUEL SYSTEM            3-9

CARBURETOR FINAL

ADJUSTMENTS        3-10

CHANGE CRANKCASE OIL      3-11

CHECK DRIVEN COMPONENT 3-12

 

4- FUEL

INTRODUCTION AND CHAPTER COVERAGE            4-1

GENERAL CARBURETOR INFORMATION      4-1

Carburetors with Float            4-1

GASOLINE, "SOUR" FUEL, AND GASOHOL            4-3

FUEL PROBLEMS            4-4

AIR CLEANERS            4-5

SERVICE FLAT CARTRIDGE AIR CLEANER            4-6

Removal          4-6

Installation        4-6

SERVICE OVAL DUAL ELEMENT AIR CLEANER            4-7

Removal          4-7

Cleaning & Inspecting            4-8

Installation        4-8

SERVICE RECTANGULAR DUAL ELEMENT AIR CLEANER 4-10

Removal          4-10

Installation        4-10

CARBURETOR SERVICE INFORMATION      4-10

SERVICE FLO-JET -- ONE-PIECE SIDE DRAFT CARB.URETOR

Removal & Disassembling            4-11

Cleaning & Inspecting            4-15

Assembling & Installation            4-16

CARBURETOR ADJUSTMENT OHV ENGINES            4-22

THROTTLE CONTROLS, CHOKE AND GOVERNOR LINKAGE 4-23

MECHANICAL GOVERNOR            4-26

Static Adjustment            4-27

 

5- IGNITION

INTRODUCTION AND CHAPTER COVERAGE            5-1

SPARK PLUG EVALUATION         5-1

SERVICE MAGNETRONS       5-4

Removal          5-5

Disassembling  5-6

Cleaning & Inspecting            5-6

Assembling     5-6

Installation        5-6

Air Gap Table            5-7

 

6- ENGINE BLOCK

INTRODUCTION AND CHAPTER COVERAGE            6-1

DISASSEMBLING     6-2

Preparation       6-2

Valves, Valve Retainers, Rocker Arm & Push Rods            6-3

Cylinder Head  6-4

Flywheel          6-5

Oil Pump   6-7

Crankcase Cover            6-8

Camshaft        6-11

Connecting Rod & Piston   6-11

Piston Disassembly            6-12

Crankshaft & Cam Gear     6-13

CLEANING & INSPECTING Breather Valve            6-15

Valves, Springs, & Seats    6-16

Oil Pumps, Stingers & Dippers 6-19

Piston, Rings, & Rod            6-21

Crankshaft Service            6-24

Cylinder Service            6-26

Magneto & PTO Bearings            6-28

Flywheel Service            6-29

ASSEMBLING Crankshaft          6-30

Piston & Connecting Rod      6-30

Camshaft & Gear            6-34

Oil Pump   6-38

Breather           6-39

Flywheel          6-41

Valves            6-42

Cylinder Head  6-43

Muffler & Exhaust Pipe            6-45

Rocker Arm & Push Rod      6-45

Valve Cover   6-46

 

7- ELECTRICAL

INTRODUCTION      7-1

BATTERIES            7-1

Nickel Cadmium             7-1

Dry Storage-Type             7-2

Lead Acid-Wet Cell             7-2

Gel Cell      7-5

JUMPER CABLES            7-5

ALTERNATORS       7-6

Simple Testing             7-6

Detailed Testing            7-7

CRANKING MOTOR CIRCUIT            7-12

CRANKING MOTOR TROUBLESHOOTING            7-13

CRANKING MOTOR SERVICE 7-13

Removal & Disassembly            7-14

Cleaning & Inspecting            7-15

Testing Components            7-16

Assembling     7-17

 

8- HAND REWIND STARTER 

INTRODUCTION AND CHAPTER COVERAGE            8-1

SERVICE TYPE "A" – TOP MOUNT -- HORIZONTAL PULL 8-2

Removal & Disassembling            8-2

Cleaning & Inspecting            8-4

Assembling & Installation            8-5

SERVICE TYPE "B" -- TOP OR SIDE MOUNT            8-7

Removal & Disassembling            8-7

Cleaning & Inspecting            8-7

Assembling & Installation            8-7

ROPE REPLACEMENT       8-9

FLYWHEEL BRAKE            8-12

Removal          8-12

Inspection        8-13

Assembling & Installation            8-14

Brake Shoe Test            8-16

 

9- MAINTENANCE

INTRODUCTION      9-1

PERIODIC MAINTENANCE       9-1

MAINTENANCE SCHEDULE            9-2

CRANKCASE LUBRICATION         9-3

AIR CLEANER            9-6

BREATHERS            9-7

IGNITION SYSTEM            9-8

VALVE CLEARANCE CHECK AND ADJUSTMENT          9-10

PREPARATION FOR STORAGE 9-11

 

10- COUNTERBALANCE 

DESCRIPTION         10-1 

SERVICE OSCILLATING COUNTERBALANCE            10-1

Preparation       10-2

Removal          l0-2

Disassembling  10-2

Inspection        10-3

Assembling & Installation            10-3

SERVICE ROTATING COUNTERBALANCE            10-4

Preparation       10-4

Removal          10-4

Inspection        10-4

Installation        10-4

 

APPENDIX

METRIC CONVERSION CHART A-1 

DRILL SIZE CONVERSION CHART A-2 

BRIGGS & STRATTON MODEL NUMBER GUIDE            A-3

CONVERSION CHART – MODEL NUMBER/HORSEPOWER            A-4

ALTERNATORS       A-5

VALVE TAPPET CLEARANCE            A-5

CAMSHAFT REJECT SIZES  A-5

IDLE SPEED TABLE            A-6

ENGINE OIL CAPACITY            A-6

ARMATURE AIR GAP            A-6

CYLINDER BORE STD. DIA.    A-6

CRANKCASE BEARING REJECT A-6

PISTON PIN REJECT            A-7

CRANKSHAFT REJECT            A-7

RING END GAP REJECT            A-7

CONNECTING ROD REJECT A-7 

FLYWHEEL NUT TORQUE VALUE A-8 

CRANKCASE COVER BOLT TORQUE VALUE            A-8

CONNECTING ROD BOLT TORQUE VALUE            A-8

CYLINDER HEAD BOLT TORQUE VALUE            A-8