GCV140 /160 /190
GOVERNOR
MAXIMUM SPEED
ADJUSTMENT
ADJUSTMENT
GOVERNOR
ARM
Adjustable-Throttle
WARNING
1
Without Throttle
Control Plate
Fixed Throttle
1. Loosen the governor arm nut on the
governor arm.
2. Push the governor arm away from the
carburetor to open the carburetor throttle
valve fully.
GOVERNOR
ARM NUT
BEND
BEND
Cleaning
Check the fuel tube
for deterioration,
cracks and gasoline
leakage.
GOVERNOR SPRING ARM
Throttle type
12 N・m
Maximum engine speed
12 N・m
2,950 ~ 3,100 rpm
Adjustable-Throttle
Fixed Throttle(no load)
75 N・m
3,100 ± 150 rpm
Without Throttle
Control Plate(no load)
Valve clearance inspection and adjustment must be
performed with the engine cold.
CAM LOBE
6
12 N・m
Do not reuse
Cleaning
Remove carbon deposits
by lightly tapping the outer flange
with a plastic hammer before installation.
Cleaning
12 N・m
0.15 ± 0.04 mm (IN) 0.20 ± 0.04 mm (EX)
5
3
INSPECTION
SECONDARY SIDE
2
Do not reuse
Flywheel type
Clearance
Flywheel type
ALUMINUM
0.2 - 0.6 mm
Primary side
resistance value
ALUMINUM
1.0 - 1.2 Ω
ALUMINUM
10.6 - 12.8 Ω
CAST-IRON
0.2 - 0.5 mm
CAST-IRON
0.68 - 0.84 Ω
CAST-IRON
5.6 - 6.9 Ω
PISTON DISASSEMBLY/REASSEMBLY
Install all rings with the markings facing up.
Space the piston ring end gaps 120° apart.
T
MANUFACTURER’S
MARK
TOP RING
(CHROME PLATED)
4
Flywheel type
Secondary side
resistance value
12 N・m
12 N・m
9.8 N・m
Do not reuse
7
CAM PULLEY
CYLINDER
HEAD COVER
MATING
SURFACE
12 N・m
OIL RING
SIDE RAIL
SPACER
SIDE RAIL
Do not align the end gap
of the clip with the cutout
in the piston pin bore.
CLIP
FW
CUT OUT
1.8 N・m
6
12 N・m
1
8 N・m
9.8 N・m (AdjustableTypes)
10 N・m (Fixed / Without Throttle
Do not reuse
Do not reuse
Control PlateTypes)
Do not reuse
12 N・m
INSTALLATION
ALIGNMENT MARKS
8 N・m
5
CAM
PULLEY
6
12 N・m
SPARK PLUG
Recommended
Spark plug
WOODRUFF KEY GROOVE
1. Turn the crankshaft so the two woodruff key grooves
on the PTO side face away from the cylinder block.
2. Install the cam pulley on the timing belt so the cam
pulley alignment marks are in line with the cylinder
head covermating surfaces.
3. Apply oil to the O-ring and install the o-ring on
the cam pulley shaft.
4. Install the cam pulley shaft in the cylinder block.
5. Holding the cam pulley alignment marks in line with
the cylinder head cover mating surface, make sure
the two woodruff key grooves on the PTO side of
the crankshaft are facing away from the cam pulley.
6. If the two woodruff key grooves are not facing away
from the cam pulley, repeat the procedure from step 1.
ENGINE OIL
0.7 - 0.8 mm
Spark plug gap
SECOND RING
“FW ▼ ”
MARK
・Assemble within 10 minutes after applying
the liquid gasket.
・Wait for 20 minutes after assembly. Do not
add oil or start the engine during this period.
4
3
FLYWHEEL
20mm
Hondabond HT,ThreeBond 1216 or equivalent
12 N・m
12 N・m
120°
120°
120°
CYLINDER HEAD COVER
CYLINDER BLOCK
12 N・m
12 N・m
6. Insert a feeler gauge between the valve stem and the adjusting screw on the
rocker arm.
VALVE CLEARANCE
LIQUID GASKET
ALUMINUM
FLYWHEEL TYPES
2
TOP DEAD CENTER
1.8 N・m
12 N・m
12 N・m
3
PRIMARY SIDE
IGNITION COIL
FUEL TUBE
INCREASE DECREASE
SPEED
SPEED
IGNITION COIL
IGNITION COIL AIR GAP
Check the fuel tube
for deterioration,
cracks and gasoline
leakage.
2.9 N・m
CAST-IRON
FLYWHEEL TYPES
1. Remove the spark plug cap from the spark plug.
2. Remove the fan cover and fuel tank.
3. Remove the four flange bolts from the cylinder head cover.
4. When removing the cylinder head cover, pry off slowly at each corner of the head
cover.
5. Rotate the flywheel until the cam lobe faces directly out, away from the cylinder
head as shown. This will set the piston at top dead center of the compression
VALVE
stroke (both valves are fully closed).
ADJUSTMENT
LOCK NUT
VALVE
STEM
To increase valve clearance, screw out.
To decrease valve clearance, screw in.
Cleaning
2.3-2.8N・m
VALVE CLEARANCE
VALVE ADJUSTMENT
SCREW
VALVE ADJUSTMENT
LOCK NUT
TORQUE:
8 N•m
8.3 N・m
75 N・m
3. Holding the carburetor throttle valve fully open,
turn the governor arm shaft clockwise fully, and
tighten thegovernor arm nut to the specified torque.
TORQUE: 10 N•m (Adjustable-Throttle Types)
9.8 N•m (Fixed Throttle/ Without Throttle
Control Plate Types)
4. Check to see whether the governor arm and the
carburetor throttle valve arm operate smoothly.
5. Start the engine and warm it up to the normal
operating temperature. Check the maximum engine
speed.
6. If adjustment is necessary, bend the governor spring
tab on the throttle control plate very slightly.
• Left increases spring tension and engine speed.
• Right decreases spring tension and engine speed.
FEELER GAUGE
FUEL TUBE
Gasoline is highly flammable and explosive. Confirm
no leaks are present in fuel system parts.
Pressure washer
applications
NGK BPR6ES
All others
NGK BPR5ES
ENGINE STOP SWITCH
ROTARY TYPE
0.50 L
SAE 10W-30
API Service Classification SJ
or later oil.
Recommended oil
INSPECTION
PLUNGER TYPE
1. Disconnect the engine
switch terminal end from
the ignition coil.
2. Turn the switch to both
positions and check
continuity between
the wire and the control
base with an ohmmeter.
Switch position
Engine oil capacity
There should be continuity when
the plunger is pushed in.
There should be no continuity when
the plunger is released.
Replace the engine stop switch
if the correct continuity test
results are not obtained.
Continuity
ON
No
OFF
Yes
6
© Honda Motor Co., Ltd. Power Product Service Division.
CARBURETOR
IDLE SPEED ADJUSTMENT
7
Adjust the throttle stop screw to obtain the specified idle speed.
THROTTLE STOP SCREW
• On fixed-throttle applications,
the idle speed cannot be adjusted.
• The standard idle speed may
vary depending on the application.
Refer to the equipment
manufacturer’s recommendation
for the idle speed specification.
Standard idle speed
All other
PLUNGER
GCV190N5AV
1,700 ± 150 rpm
2,350 rpm minimum
REMOVAL
INSTALLATION
Do not attempt to remove the limiter cap for pilot screw
adjustment. The limiter cap cannot be removed without
breaking the pilot screw.
Do not reuse
Install in the
direction shown.
CLEANNING
Clean the body and passege by spraying
carburettor cleaner before installation.
THROTTLE STOP
SCREW
Do not reuse
Install in the
direction shown.
MAIN JET
Do not reuse
Install in the
direction shown.
S2ZDM400en
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