Suzuki EN125-2A, Service Manual

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2-7 PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES
Remove the carbon deposits with a wire or pin and
adjust the spark plug gap to 0.7-0.8 mm,
measuring with a thickness gauge.
When removing 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 colder one.
NOTE:
"R" type spark plug fitted under some of
specifications and it means that the resistor
is located at the center electrode to prevent
radio noise.
COMPRESSION PRESSURE
Inspect initial 1 000 km Every 4 000 km
Refer to page 3-1.
SPARK PLUG
Inspect initial 1 000 km and Every 4 000 km
Replace Every 8 000 km
NGK CR7E
NIPPON DENSO U22ESR-N
Hot type
NGK CR8E
NIPPON DENSO U24ESR-N
Standard
NGK CR9E
NIPPON DENSO U27ESR-N
Cold type
0.7 mm-0.8 mm