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ROYAL ENFIELD UCE ENGINE SERVICE MANUAL
147
Adulterated / Bad fuel
Clean fuel tank
Fill with fresh fuel
Spark plug Electrode gap too less
Check and correct electrode gap
A. Black smoke
Spark plug wrong specifications
Replace with correct spark plug
Air Filter element clogged
Check & Clean
Pulse air valve pipe connections
Check & correct
loose / cracked
Ignition coil defective
Check & replace
B. Brown smoke
Adulterated / Bad fuel
Clean fuel tank.
Fill with fresh fuel
Air filter box poorly sealed /
Check & correct
element partially clogged
C. Bluish / White smoke
Engine oil level too high
Check & Maintain Oil level as
Recommended
Valve stem seal damaged
Check & correct
Excess clearance between valve
Check & correct
stem & guide
Oil scrapper ring worn out
Check & correct
Cylinder barrel / piston clearance
Check & replace
high
Symptom
Probable Cause
Remedy
13.6 EXHAUST SMOKE EXCESS