This manual covers the following basic type or model numbers dependent on age of product: AH520, AH600, AV520, AV600, HSK600, TVS600.
This manual covered many engines under an Old form of Identification which will need to be reviewed as well.
TYPE / SPECIFICATION NUMBER 638-670 1398-1642 and Craftsman 200 Series Models.
2-CYCLE ENGINES
GENERAL INFORMATION 1
ENGINE IDENTIFICATION 1
INTERPRETATION OF MODEL NUMBER 1
ENGINE CARE 2
SHORT BLOCKS 2
STORAGE 2
TUNE-UP PROCEDURE 3
EXHAUST PORT CLEANING 3
2-CYCLE THEORY OF OPERATION 4
OPERATION OF PISTON PORT STYLE 4
OPERATION OF REED PORTED STYLE WITH LOOP SCAVENGING 4
TERMS 4
EXHAUST OR SCAVENGE PHASE 4
PORTS 4
EXHAUST PORTS 4
THIRD PORT 4
REED VALVE 4
LUBRICATION 4
AIR CLEANERS, CARBURETORS, GOVERNORS AND LINKAGE 5
AIR CLEANERS 5
POLYURETHANE-TYPE AIR CLEANER 5
KLEEN-AIRE® SYSTEM 5
PAPER-TYPE AIR CLEANER SERVICE 5
GENERAL CARBURETOR INFORMATION 6
CARBURETOR IDENTIFICATION 6
FLOAT-TYPE CARBURETORS 6
DIAPHRAGM (PRESSURE DIFFERENTIAL) CARBURETORS 6
OPERATION 7
CARBURETOR SERVICE 7
THROTTLE 7
CHOKE 8
ADJUSTING SCREWS 8
FUEL BOWL RETAINING NUT 8
CARBURETOR VENTING 8
HIGH TILT FLOAT STYLE 8
FUEL BOWL 8
FLOAT 8
INLET NEEDLE AND SEAT (FLOAT CARBURETORS) 9
NEEDLE AND SEAT OPO-OFF TEST 9
FLOAT HEIGHT SETTINGS 9
PRIMER BULB 10
CLEANING CARBURETOR BODY 10
DIAPHRAGMS 10
INLET NEEDLE AND SEAT 11
FUEL INLET FITTING 11
PRIMER BULB (DIAPHRAGM CARBURETOR) 11
CARBURETOR CHECK VALVE 11
CARBURETOR SERVICE PROCEDURE 12
EMISSIONIZED DIAPHRAGM CARBURETION 13
OUTBOARD CARBURETORS 13
OUTBOARD CONTROL PANEL 14
CARBURETOR ADJUSTMENTS 15
IDLE SPEED ADJUSTMENT 15
FLOAT TYPE-FIXED MAIN, IDLE ADJUST 15
DIAPHRAGM - SINGLE AND DUAL ADJUSTMENT 15
TROUBLESHOOTING CARBURETION 16
FLOAT CARBURETOR CHECKS 16
CHECKS FOR DIAPHRAGM 16
STANDARD SERVICE CARBURETORS 17
FUEL FITTING17
INLET FUEL FITTING 17
CHOKE SHAFT 17
THROTTLE LEVER 17
IDLE SPEED ADJUSTMENT SCREW 17
GOVERNORS AND LINKAGE 18
AIR VANE GOVERNORS 18
OPERATION 18
LINKAGE INSTALLATION 18
REWIND STARTERS, ELECTRIC STARTERS AND ALTERNATORS 20
REWIND STARTERS 20
COMPONENTS 20
ROPE SERVICE 20
STYLIZED REWIND STARTER 21
VERTICAL PULL STARTER HORIZONTAL ENGAGEMENT TYPE 22
STYLIZED REWIND STARTER WITH PLASTIC RETAINER 23
VERTICAL PULL STARTER, VERTICAL ENGAGEMENT TYPE 24
REWIND STARTER MOUNTED IN HOUSING 25
ELECTRIC STARTERS 26
DRIVE ASSEMBLY SERVICE 26
STARTER CHECKING AND SERVICE 27
CHECK FIELD 27
ARMATURE CHECK 27
TROUBLESHOOTING STARTERS 27
ALTERNATORS 28
CHECKING THE SYSTEM 28
FLYWHEEL (INSIDE-EDGE) BRAKE SYSTEM 29
INSIDE EDGE SYSTEM 29
COMPONENTS 29
SERVICE 29
CONTROL CABLE 30
IGNITION 31
IGNITION OPERATION (Pre- 1985 Production) 31
MAGNETO IGNITION 31
CONTACT POINTS 31
CONDENSER 31
OPERATION OF THE TECUMSEH MAGNETO IGNITION 31
SOLID STATE IGNITION (1985 to Present) 32
SOLID STATE IGNITION OPERATION 32
IGNITION SERVICE 33
SPARK PLUG SERVICE 33
FLYWHEEL REMOVAL AND SERVICE 33
FLYWHEEL MAGNETS 33
FLYWHEEL KEYS 34
ADAPTER KEY TO FLYWHEEL ASSEMBLY 34
FLYWHEEL SLEEVE 34
FLYWHEEL TORQUE 34
REPLACING MAGNETO BREAKER POINTS 34
CONDENSER CHECK 34
IGNITION COIL 34
IGNITION TIMING 34
FIXED TIME SPEED (EXTERNAL COIL 36
SOLID STATE (CDI) 36
OTHER IGNITION SYSTEMS 36
OUTBOARD TIMING 38
OUTBOARD TIMING (STANDARD IGNITION) 38
OUTBOARD TIMING (SOLID STATE) 39
CYLINDERS & INTERNAL COMPONENTS 41
PISTON & RING SERVICE 41
CONNECTING ROD SERVICE42
NEEDLE BEARINGS 42
CRANKSHAFT, BEARING AND OIL SEALSERVICE 43
NEEDLE BEARINGS 43
OIL SEALS 43
ONE PIECE SEALS 43
THREE PIECE SEALS 44
OUTBOARD SEAL SERVICE 44
CYLINDERS, REEDS & COMPRESSION RELEASE 45
CYLINDER & HEAD SERVICE 45
GASKETS 45
REED VALVES 45
AUTOMATIC COMPRESSION RELEASE (DOUBLE REED TYPE 45
AUTOMATIC COMPRESSION RELEASE (SINGLE REED TYPE) 45
CYLINDER EXHAUST PORTS 46
TROUBLESHOOTING 47
ENGINE FAILS TO START OR STARTS WITH DIFFICULTY 47
ENGINE KNOCKS47
ENGINE MISSES UNDER LOAD 48
ENGINE LACKS POWER 48
ENGINE OVERHEATS 48
ENGINE SURGES OR RUNS UNEVENLY 49
ENGINE VIBRATES EXCESSIVELY 49
SPECIFICATIONS 50
ENGINE TYPE NUMBER AND LETTER REFERENCE 50
SEARS CRAFTSMAN CROSS REFERENCE 51
TABLE OF SPECIFICATIONS 52 - 61
TABLE OF TORQUE LIMITS 62
EDUCATIONAL MATERIALS AND TOOLS 63
AVAILABLE TECHNICIAN'S HANDBOOKS 63
AVAILABLE FOREIGN TECHNICIAN'S HANDBOOKS 63
TOOL KIT 670195D 64
TOOLS 65
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