Spark Plug
Engine Oil
1
2
3
4
1
2
3
Prolonged storage
1
2
3
Air Cleaner Element
Squeeze
3
2
6
1
Soak
4
Squeeze
5
Oil
4
＊
Read and understand the Owner’s Manual before operating the engine.
Engine Oil
Item
Regular service
Period
Air Cleaner
Spark Plug
Spark arrester
(
applicable types
)
Idle speed
Fuel tank and filter
Combustion chamber
Fuel filtration cup
Valve Clearance
Fuel tube
Before
each use
First month
or 20Hours
Every 500Hours
Every 2years
Every
3 months
or 50Hours
Every
6 months
or 100Hours
Every year
or 300Hours
check
fill/add
replace
replace
replace
check readjust
check readjust
check
clean
check readjust
clean
clean
clean
Maintenance Schedule
＊
Take the engine to
a servicing dealer.
＊
Clean the aircleaner when used in dusty areas every 10hours or once a day
Quick Reference Guide
Quick Reference Guide
for Maintenance
OVER
2
1
3 4
1
1
2
3 4
1 2
2 3
API service category SJ or later
SAE 10W-30 is recommended for general use
0.7−0.8mm
（0.029−0.031 in）
GX120-GX390
GX120-GX390
