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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)

Suzuki RM85 User Manual

Questions and Answers: