Spark Plug; Air Cleaner; Standard Spark Plug; Air Cleaner Element Removal - Suzuki RM250 Owner's Service Manual

2·3 PERIODIC MAINTENANCE
SPARK PLUG
Inspect t he spark plug condition, electrode color, ca rbon
deposits, spark plug gap, and washe r damage. after re mov-
ing the spark pl ug.
NOTE: Remove the dirt around the spark plug before
removing the spark plug to prevent dirt from entering the
combustion chamber.
Inspect the po rcelain tip color.
Porcelain tip color Cause
•
Hot t ype spark plug
•
Advanced ign it ion t iming
W hite (overheated)
•
Lea n ai r/fu el mixtu re
•
Deteriorated f uel
•
Cold type spa rk plug
•
Retarded ig nition timing
Black (fouled)
•
Rich ai r/fuel mixture
•
Rich oil/gasol ine mixture
Clean the spark plug with a brush or wi re and check t he spark
plug ga p with a thickness gauge.
Spark plug gap : 0 .55 - 0 .65 mm (0 .022 - 0 .026 in)
Stand ard Spark plug
NGK R411 BS· B
A
CAUTION
Changing the spark plug heat range improperly can
damage the engine .
Select the spark plug heat rang e only after adjusting the
ignition timing . carburetor setting and oil/gasoline mixture.
Tighten the spark plug with specif ied t ighteing torque after
tighteni ng the spark pl ug tem porari ly with fingers.
Tightening torque : 2S N.m (2 .S kg-m . 20 .0 Ib -ft)
AIR CLEANER
Air Cleaner Element Removal
• Remove the seat.
• Remove the air clea ner ca p.
• Remove sc rew
CD.
0.55 - 0.65 mm
(0.022 - 0.026
in)