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ROYAL ENFIELD VEHICLE SERVICE MANUAL - EURO IV
293
A. Ignition related
Spark plug electrode gap too less/
Check and correct electrode gap
excessive
Spark plug wrong specifications
Replace with correct spark plug
Spark plug insulator cracked
Check & replace
Suppressor cap/ H T lead loose
Check & correct as required
Suppressor cap/ H T lead defective
Check & correct as required
Ignition coil defective
Check & Replace
Pulsar coil / Magneto defective
Check & replace
Adulterated / stale fuel / water
Check, Clean fuel tank.
content in fuel
Fill with fresh fuel
Fuel flow partially blocked
Check & clean fuel tap / filter
B. Fuel / Induction related
Inlet manifold loose / cracked
Check & tighten / replace inlet
manifold
C. Compression Related
Spark plug loose
Tighten spark plug to torque
Tappets adjusted too tight
Check & adjust tappets
correctly
Cylinder head bolts loose
Check & tighten to torque
Cylinder head gasket damaged
Check & Replace
Cylinder head warped
Check & Replace
Valve spring broken or weak
Check & Replace
Valve not seating properly (valve
Check & Replace
bent, worn, carbon accumulation
on the seating surface.)
Excessive Carbon in combustion
Check & Clean
chamber
Piston ring bad (worn, weak,
Check & Replace
broken, or sticking)
Piston rings clearance excessive
Check & Replace
Cylinder, piston worn
Check & Replace
5. ENGINE MISFIRING AT HIGH SPEEDS/ HIGH RPM.
Attribute
Probable Cause
Remedy
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