Suzuki RM85L - Spark Plug and Air Cleaner Maintenance

2-4 PERIODIC MAINTENANCE
SPARK PLUG
• Inspect the spark plug condition, electrode color, carbon
deposits, spark plug gap, and washer damage, after removing
the spark plug.
NOTE:
Remove the dirt around the spark plug before removing the
spark plug to prevent dirt from entering the combustion cham-
ber.
• Inspect the porcelain tip color.
• Check the spark plug gap with a thickness gauge.
 Spark plug gap: 0.7 – 0.8 mm (0.028 – 0.031 in)
 Standard Spark plug
• Tighten the spark plug with specified tightening torque after
tightening the spark plug temporarily with fingers.
 Spark plug: 28 N·m (2.8 kgf-m, 20.5 lb-ft)
Porcelain tip color Cause
White (overheated)
• Hot type spark plug
• Advanced ignition timing
• Lean air/fuel mixture
• Deteriorated fuel
Black (fouled)
• Cold type spark plug
• Retarded ignition timing
• Rich air/fuel mixture
• Rich oil/gasoline mixture
NGK BR10ES
CAUTION
Changing the spark plug heat range improperly can
damage the engine.
Select the spark plug heat range only after adjusting
the ignition timing, carburetor setting and oil/gasoline
mixture.
0.7 – 0.8 mm
(0.028 – 0.031 in)