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
drawings online on GENservice at www.generac.com.
Cylinder Head
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0J35240147 6 BOLT, FLANGE
2 0J39340112 1 COVER, VALVE
3 0J39340113 1 GASKET, VALVE COVER
4 0J39340114 1 TUBE, BREATHER
5 0G84420211 4 BOLT, HEAD FLNG., 10×80
6 0G84420210 2 BOLT, STUD, EXHAUST
7 0J00620106 1 SPARK PLUG
8 0J39340115 1 HEAD, CYLINDER
9 0J00620107 1 GASKET, CYLINDER HEAD
10 0G84420212 2 PIN, DOWEL
11 0K0090 2 BOLT, STUD, INTAKE
2
Crankcase
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0G84420217 2 BOLT, FLANGE
2 0G84420105 1 SWITCH ASSY., OIL LEVEL
3 0G84420118 1 BEARING, RADIAL BALL 6202
4 0G84420218 1 WASHER, FLAT 8*16*1.2
5 0G84420219 1 PIN, LOCK, 10MM
6 0G84420220 1 SHAFT, GOVERNOR ARM
7 0G84420108 1 SEAL, OIL
8 0G84420110 2 BOLT, DRAIN PLUG
9 0G84420109 2 WASHER, DRAIN PLUG, 12MM
10 0H98380100 1 CRANKCASE, (ELECT. START)
11 0J35250337 1 CLEAT, CABLE
12 0G84420194 1 BOLT, FLANGE, 6×12
13 0G84420112 1 ALERT UNIT,OIL
14 0G84420194 1 BOLT, FLANGE, 6×12
15 0G84420116 1 SEAL, OIL
3
Crankcase Cover
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0G9799 2 DIPSTICK/CAP ASSY
2 0G84420221 1 GOVERNOR ASSY.
3 0G84420118 1 BEARING, RADIAL BALL 6202
4 0G84420117 1 BEARING, RADIAL BALL 6207
5 0G84420228 2 PIN, DOWEL 8×12
6 0G84420115 1 GASKET, CRANKCASE COVER
7 0G84420116 1 SEAL, OIL
8 0G84420227 1 CRANKCASE COVER
9 0G84420229 7 BOLT, FLANGE 8X40
4
Crankshaft and Piston
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0J28790111 1 RING SET,PISTON
2 0G84420237 2 CIRCLIP, PISTON PIN
3 0K22930111 1 PISTON
4 0G84420238 1 PIN, PISTON
5 0J00620113 1 CONNECTING ROD ASSY
6 0G84420236 2 BOLT, CONNECTING ROD
7 0J00620108 1 CRANKSHAFT ASSY
8 0G84420119 1 KEY, SPECIAL WOODRUFF
9 0J00620111 1 WEIGHT, BALANCER
5
Rocker and Camshaft
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0J39430124 1 ROCKER ARM EXH.
2 0J39430125 1 ROCKER ARM INT.
3 0J93060101 2 VALVE ROCKER SHAFT
4 0J39430127 2 PUSH ROD
5 0G84420174 2 LIFTER, VALVE
6 0G84420122 2 ROTATOR, VALVE
7 0G84420239 4 LOCKER, VALVE
8 0G84420123 2 RETAINER, VALVE SPRING
9 0G84420124 2 SPRING, VALVE
10 0G84420125 1 SEAT, VALVE SPRING
11 0G84420128 1 SEAL, VALVE STEM
12 0J39430126 1 VALVE ASSY.
13 0G8442F114 1 CAMSHAFT ASSY
14 0J93060102 2 LOCKER
15 0K22930113 1 RETAINER, ROCKER ARM SHAFT
16 0G84420194 1 BOLT, FLANGE
17 0K6775 1 ROCKER ARM ASSY. EXHAUST
18 0K6777 1 ROCKER ARM ASSY. INTAKE
6
Starter
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0H9838D102 1 STARTER, RECOIL W/HSNG.
2 0G84420241 4 BOLT, FLANGE 6×8
3 0J0813AST15 1 STARTER ASSY.
4 0G8442A115 1 COVER COMP., FAN
5 0J39340117 1 SHROUD
6 0G84420194 5 BOLT, FLANGE 6×12
7
Flywheel and Ignition
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0G84420150 1 COIL ASSY. , IGNITION
2 0G84420267 1 GROMMET, CORD
3 0G84420268 2 BOLT, FLANGE, M6X25
4 0H98380104 1 FLYWHEEL, (ELECT. START) COMP.
5 0G84420147 1 FAN, COOLING
6 0G84420148 1 PULLEY, STARTER
7 0G84420149 1 NUT SPECIAL, 16MM
8
Air Cleaner and Carburetor
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0G84420144 1 GASKET, INSULATOR
2 0J25910112 1 SPACER, CARBURETOR
3 0G9916 1 GASKET, CARB. TO SPACER
4 0H9838E110 1 CARBURETOR ASSY
5 0K65110119 1 HOSE, FUEL
6 0K65110118 1 FILTER, FUEL(IN-LINE)
7 0H9838C110 2 CLAMP, HOSE
8 0G84420156 1 GASKET, CARB. TO AIR CLEANER
9 0G8442C111 1 AIR CLEANER
NOT
SHOWN
0G84420151 1 ELEMENT, AIR FILTER
9
Control System
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0G8442G111 1 CONTROL ASSY.
2 0G84420194 2 NUT, FLANGE M6
3 0J00620122 1 SPRING, CABLE RETURN
4 0J39430132 1 SPRING, THROTTLE RETURN
5 0J39430133 1 ROD, GOVERNOR
6 0G84420272 1 NUT, FLANGE M6
7 0G84420197 1 BOLT, QUADRATE HEAD
8 0G84420198 1 ARM, GOVERNOR
10
Exhaust Manifold
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0J4535A 1 MANIFOLD, EXH. PIPE
2 0J35220161 5 NUT, HEX., M8
3 0G9028 1 GASKET, MUFFLER
11
Starter Motor
420cc ENGINE
ITEM PART NO. QTY. DESCRIPTION
1 0H9838E111 1 MOTOR ASSY., STARTER
2 0H98380103 2 BOLT, FLANGE,
3 0H98380101 1 MOTOR, STARTER
4 0H98380102 1 CONTACTOR ASSY
5 0J4968 2 BOLT, FLANGE,
Manual No. 0H9838EPMNL Revision A (06/19/14) Printed In U.S.A.
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