FAILURE TO START/
DIFFICULTIES IN STARTING
8-2
TRBL
SHTG
?
Spark plug
Ignition coil
Ignition unit
Switches and cables
PROBABLE CAUSES
•
Electrodes gap not correct
•
Electrodes worn
•
Feed cable interrupted
•
Wrong thermal grading of spark plug
•
Defective spark plug cap
•
Primary or secondary winding interrupted
•
High voltage cable defective
•
Defective coil
•
Defective unit
•
Defective pick-up coil
•
Woodruff key broken
Starter motor
•
Starter motor defective
•
Starter motor relay defective
•
Diodes defectives
•
Starter one-way bearing defective
•
Main switch defective
•
Emergency stop engine switch defective
•
Harness with cable interrupted
•
Neutral switch defective
•
Sidestand switch defective
•
Clutch switch defective
•
Starter switch defective
ELECTRICAL SYSTEM
Cylinder and cylinder head
Piston and piston rings
Crankcase and valves, crankshaft
PROBABLE CAUSES
•
Spark plug tightening insufficiently
•
Cylinder head or cylinder insufficiently tightened
•
Cylinder head gasket broken
•
Cylinder gasket broken
•
Cylinder worn, damaged or seized
•
Piston rings wrongly assembled
•
Piston rings worn, yielded or broken
•
Piston rings stuck together
•
Piston seized or damaged
•
Poor crankcase sealing
•
Crankshaft oil seal edge damaged
•
Poor valve sealing
•
Valve and seat with insufficient contact
•
Valve timing wrongly
•
Valve spring broken
•
Crankshaft seized
•
Camshaft seized
POOR ENGINE COMPRESSION
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