Electrical System; Poor Engine Compression - Yamaha TT600R Service Manual

ELECTRICAL SYSTEM

Spark plug
Ignition coil
Ignition unit
Switches and cables
Starter motor

POOR ENGINE COMPRESSION

Cylinder and cylinder head
Piston and piston rings
Crankcase and valves, crankshaft
FAILURE TO START/
DIFFICULTIES IN STARTING
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
•
Main switch defective
•
Emergency stop engine switch defective
•
Harness with cable interrupted
•
Neutral switch defective
•
Sidestand switch defective
•
Clutch switch defective
•
Starter switch defective
•
Starter motor defective
•
Starter motor relay defective
•
Diodes defectives
•
Starter one-way bearing defective
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
8-2
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TRBL
SHTG