Spark Plugs - Suzuki GW250 Service Manual

2-6 PERIODIC MAINTENANCE

SPARK PLUGS

Inspect every 5 000 km (3 000 miles, 15 months).
Replace every 10 000 km (6 000 miles, 30 months).
REMOVAL
• Disconnect the spark plug caps.
• Remove the spark plugs.
 09930-10121: Spark plug wrench set
HEAT RANGE
• Check spark plug heat range by observing electrode color. If
the electrode of the spark plug is wet appearing or dark color,
replace the spark plug with hotter type one. If it is white or
glazed appearing, replace the spark plug with colder type
one.
Hot type
NGK CR6E
ND U20ESR-N
CARBON DEPOSITS
• Check carbon deposits on the spark plug.
• If carbon is deposited, remove it using a spark plug cleaner
machine.
SPARK PLUG GAP
• Measure the spark plug gap A with a thickness gauge.
• Adjust the spark plug gap if necessary.
 Spark plug gap:
Standard: 0.7 – 0.8 mm (0.028 – 0.031 in)
 09900-20803: Thickness gauge
Standard Cold type
CR7E CR8E
U22ESR-N U24ESR-N