Tuneup Specifications
GX240/GX270/GX340/GX390
ITEM
SPECIFICATION
Spark plug gap
0.7 0.8 mm
−
(0.028 0.031 in)
Idle speed
1,400
Valve clearance
IN: 0.15
(cold)
EX: 0.20
Other
specifications
Quick Reference Information
Fuel
Unleaded gasoline
U.S.
Except
U.S.
Engine oil
SAE 10W-30, API SJ or later, for general use.
Refer to page 8.
Reduction
Same oil as engine oil, see above (applicable
case oil
types).
Spark plug
BPR6ES (NGK)
W20EPR-U (DENSO)
Maintenance
Before each use:
Check engine oil level. Refer to page 9.
Check reduction case oil (applicable types).
Refer to page 9.
Check air filter. Refer to page 10.
First 20 hours:
Change engine oil. Refer to page 9.
Change reduction case oil (applicable types).
Refer to page 10.
Subsequent:
Refer to the maintenance schedule on page 7.
MAINTENANCE
Refer to page: 12
−
±
150 rpm
Refer to page: 13
±
0.02 mm
See your
±
0.02 mm
authorized
Honda dealer
No other adjustments needed.
(Refer to page 8)
Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher
Wiring Diagrams
With Oil Alert and Electric Starter
With Oil Alert and Without Electric Starter
(1)
CONTROL BOX
(2)
RECTIFIER
(3)
FUSE
(4)
CIRCUIT PROTECTOR
(5)
ENGINE SWITCH
(6)
OIL ALERT UNIT
(7)
Type with Oil Alert unit
(8)
OIL LEVEL SWITCH
Bl
Black
Br
Y
Yellow
Bu
Blue
Lb
G
Green
Lg
R
Red
W
White
Gr
ENGLISH
(9)
CHARGING COIL
(10)
IGNITION COIL
(11)
SPARK PLUG
(12)
STARTER MOTOR
(13)
STARTER SOLENOID
(14)
BATTERY (12 V)
(15)
Type without Oil Alert unit
Brown
O
Orange
Light blue
Light green
P
Pink
Gray
19