Royal Enfield HIMALAYAN EURO IV 2017 Service Manual page 286

6. EXHAUST SMOKE EXCESS
Symptom
A. Black smoke
B. Brown smoke
C. Bluish / White smoke
Probable Cause
Adulterated / Bad fuel
Spark plug Electrode gap too less
Spark plug wrong specifications
Air Filter element clogged
Pulse air valve pipe connections
loose / cracked
Ignition coil defective
Adulterated / Bad fuel
Air filter box poorly sealed /
element partially clogged
Engine oil level too high
Valve stem seal damaged
Excess clearance between valve
stem & guide
Oil scrapper ring worn out
Cylinder barrel / piston clearance
high
ROYAL ENFIELD HIMALAYAN EURO IV VEHICLE SERVICE MANUAL
Remedy
Clean fuel tank
Fill with fresh fuel
Check and correct electrode gap
Replace with correct spark plug
Check & Clean
Check & correct
Check & replace
Clean fuel tank.
Fill with fresh fuel
Check & correct
Check & Maintain Oil level as
Recommended
Check & correct
Check & correct
Check & correct
Check & replace
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