®
Engine Parts Manual
420cc (G19)
NOTICE!
The information in this manual is known to be accurate as of the date of release shown on the cover. However,
engineering changes can occur without notice. To obtain the proper parts, please be sure to use the serial
number of the unit being serviced when ordering from this manual. Always to refer to any parts notes and
changes before ordering. All other parts not shown in this manual can be found on Generac’s exploded view
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420cc ENGINE
Cylinder Head
ITEM PART NO.
QTY. DESCRIPTION
1
0J35240147
0J39340112
0J39340113
0J39340114
0G84420211
0G84420210
0J00620106
0J39340115
0J00620107
0G84420212
0K0090
6
1
1
1
4
2
1
1
1
2
2
BOLT, FLANGE
COVER, VALVE
2
3
GASKET, VALVE COVER
TUBE, BREATHER
4
5
BOLT, HEAD FLNG., 10×80
BOLT, STUD, EXHAUST
SPARK PLUG
6
7
8
HEAD, CYLINDER
9
GASKET, CYLINDER HEAD
PIN, DOWEL
10
11
BOLT, STUD, INTAKE
2
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420cc ENGINE
Crankcase
ITEM PART NO.
QTY. DESCRIPTION
BOLT, FLANGE
1
0G84420217
0G84420105
0G84420118
0G84420218
0G84420219
0G84420220
0G84420108
0G84420110
0G84420109
0H98380100
0J35250337
0G84420194
0G84420112
0G84420194
0G84420116
2
1
1
1
1
1
1
2
2
1
1
1
1
1
1
2
SWITCH ASSY., OIL LEVEL
BEARING, RADIAL BALL 6202
WASHER, FLAT 8*16*1.2
PIN, LOCK, 10MM
3
4
5
6
SHAFT, GOVERNOR ARM
SEAL, OIL
7
8
BOLT, DRAIN PLUG
WASHER, DRAIN PLUG, 12MM
CRANKCASE, (ELECT. START)
CLEAT, CABLE
9
10
11
12
13
14
15
BOLT, FLANGE, 6×12
ALERT UNIT,OIL
BOLT, FLANGE, 6×12
SEAL, OIL
3
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420cc ENGINE
Crankcase Cover
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
7
8
9
0G9799
2
1
1
1
2
1
1
1
7
DIPSTICK/CAP ASSY
GOVERNOR ASSY.
0G84420221
0G84420118
0G84420117
0G84420228
0G84420115
0G84420116
0G84420227
0G84420229
BEARING, RADIAL BALL 6202
BEARING, RADIAL BALL 6207
PIN, DOWEL 8×12
GASKET, CRANKCASE COVER
SEAL, OIL
CRANKCASE COVER
BOLT, FLANGE 8X40
4
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420cc ENGINE
Crankshaft and Piston
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
7
8
9
0J28790111
0G84420237
0K22930111
0G84420238
0J00620113
0G84420236
0J00620108
0G84420119
0J00620111
1
2
1
1
1
2
1
1
1
RING SET,PISTON
CIRCLIP, PISTON PIN
PISTON
PIN, PISTON
CONNECTING ROD ASSY
BOLT, CONNECTING ROD
CRANKSHAFT ASSY
KEY, SPECIAL WOODRUFF
WEIGHT, BALANCER
5
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420cc ENGINE
Rocker and Camshaft
ITEM PART NO.
QTY. DESCRIPTION
ROCKER ARM EXH.
ROCKER ARM INT.
1
0J39430124
0J39430125
0J93060101
0J39430127
0G84420174
0G84420122
0G84420239
0G84420123
0G84420124
0G84420125
0G84420128
0J39430126
0G8442F114
0J93060102
0K22930113
0G84420194
0K6775
1
1
2
2
2
2
4
2
2
1
1
1
1
2
1
1
1
1
2
3
VALVE ROCKER SHAFT
PUSH ROD
4
5
LIFTER, VALVE
6
ROTATOR, VALVE
7
LOCKER, VALVE
8
RETAINER, VALVE SPRING
SPRING, VALVE
9
10
11
12
13
14
15
16
17
18
SEAT, VALVE SPRING
SEAL, VALVE STEM
VALVE ASSY.
CAMSHAFT ASSY
LOCKER
RETAINER, ROCKER ARM SHAFT
BOLT, FLANGE
ROCKER ARM ASSY. EXHAUST
ROCKER ARM ASSY. INTAKE
0K6777
6
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420cc ENGINE
Starter
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
0H9838D102
0G84420241
0J0813AST15
0G8442A115
0J39340117
0G84420194
1
4
1
1
1
5
STARTER, RECOIL W/HSNG.
BOLT, FLANGE 6×8
STARTER ASSY.
COVER COMP., FAN
SHROUD
BOLT, FLANGE 6×12
7
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420cc ENGINE
Flywheel and Ignition
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
7
0G84420150
0G84420267
0G84420268
0H98380104
0G84420147
0G84420148
0G84420149
1
1
2
1
1
1
1
COIL ASSY. , IGNITION
GROMMET, CORD
BOLT, FLANGE, M6X25
FLYWHEEL, (ELECT. START) COMP.
FAN, COOLING
PULLEY, STARTER
NUT SPECIAL, 16MM
8
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420cc ENGINE
Air Cleaner and Carburetor
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
7
8
9
0G84420144
0J25910112
0G9916
1
1
1
1
1
1
2
1
1
GASKET, INSULATOR
SPACER, CARBURETOR
GASKET, CARB. TO SPACER
CARBURETOR ASSY
HOSE, FUEL
0H9838E110
0K65110119
0K65110118
0H9838C110
0G84420156
0G8442C111
FILTER, FUEL(IN-LINE)
CLAMP, HOSE
GASKET, CARB. TO AIR CLEANER
AIR CLEANER
NOT
SHOWN
0G84420151
1
ELEMENT, AIR FILTER
9
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420cc ENGINE
Control System
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
6
7
8
0G8442G111
0G84420194
0J00620122
0J39430132
0J39430133
0G84420272
0G84420197
0G84420198
1
2
1
1
1
1
1
1
CONTROL ASSY.
NUT, FLANGE M6
SPRING, CABLE RETURN
SPRING, THROTTLE RETURN
ROD, GOVERNOR
NUT, FLANGE M6
BOLT, QUADRATE HEAD
ARM, GOVERNOR
10
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420cc ENGINE
Exhaust Manifold
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
0J4535A
0J35220161
0G9028
1
5
1
MANIFOLD, EXH. PIPE
NUT, HEX., M8
GASKET, MUFFLER
11
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420cc ENGINE
Starter Motor
ITEM PART NO.
QTY. DESCRIPTION
1
2
3
4
5
0H9838E111
0H98380103
0H98380101
0H98380102
0J4968
1
2
1
1
2
MOTOR ASSY., STARTER
BOLT, FLANGE,
MOTOR, STARTER
CONTACTOR ASSY
BOLT, FLANGE,
Manual No. 0H9838EPMNL
Revision A (06/19/14)
Printed In U.S.A.
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