Tune-up Specifications GX240/GX270/GX340/GX390
ITEM
SPECIFICATION
Spark plug gap
0.7 – 0.8 mm
(0.028 – 0.031 in)
Idle speed
1,400 ± 150 min
Valve clearance
IN: 0.15 ± 0.02 mm
(cold)
EX: 0.20 ± 0.02 mm
Other
specifications
Quick Reference Information
Fuel
Unleaded gasoline (Refer to page 8)
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 types).
case oil
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 9.
Subsequent:
Refer to the maintenance schedule on page 7.
MAINTENANCE
Refer to page: 12
Refer to page: 13
-1
(rpm)
See your authorized
Honda dealer
No other adjustments needed.
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)
Type with Oil Alert unit
(7)
OIL LEVEL SWITCH
Bl
Black
Br
Y
Yellow
O
Bu
Blue
Lb
G
Green
Lg
R
Red
P
W
White
Gr
ENGLISH
(8)
CHARGING COIL
(9)
IGNITION COIL
(10)
SPARK PLUG
(11)
STARTER MOTOR
(12)
STARTER SOLENOID
(13)
BATTERY (12 V)
Brown
Orange
Light blue
Light green
Pink
Gray
19