Spark Plug - Suzuki GN125F Service Manual

Hook the valve rocker arm with the special tool, insert the
thickness gauge to the valve stem end and the adjusting
screw on the rocker arm.
09900 20803 Thickness gauge - :
11F14-017: Valve adjust spring
VALVE CLEARANCE SPECIFICATIONS
Valve clearance (when cold)
IN.: 0.04-0.07 mm
If the clearance is off the specification, bring it into the
specified range by using the special tool.

SPARK PLUG

Inspect initial 1 000 km and every 5 000 km, replace
every 10 000 km.
Remove the carbon deposits with a wire of pin and adjust the
spark plug gap to 0.7-0.8 mm, measuring with a thickness
gauge.
When removing the carbon deposits, be sure to observe the
appearance of the plug, noting the color of the carbon
deposits. The color observed indicates whether the standard
plug is suitable or not. if the standard plug is apt to get wet, a
hotter plug should be used. If the standard plug is apt to
overheat (porcelain is whitish in appearance), replace with a
cooler one.
Spark plug gap: 0.7-0.8 mm
09900-20803: Thickness gauge
TYPE
Hot type
Standard
Cold type
PERIODIC MAINTENANCE
EX.: 0.13-0.18 mm
NGK
CR7E
CR8E
CR9E
2-6
0.7-0.8 mm