·Seized or damaged piston
IGNITION SYSTEM
Battery Ignition system
·Improperly charged battery ·Faulty igniter unit
·Faulty battery ·Faulty pick up coil
Fuse ·Broken magneto
·Burnt out, improper connection woodruff key
Spark plug Switch
·Improper plug gap ·Faulty main switch
·Worn electrodes ·Faulty “ENGINE STOP”
·Wire between terminals broken switch
·Improper heat range ·Faulty brake switch
·Faulty spark plug cap Wiring
Ignition coil ·Loose battery terminal
·Broken or shorted primary/ ·Loose coupler connection
secondary coil ·Improperly grounded
·Faulty high tension cord ·Broken wire harness
·Broken ignition coil body
POOR IDLE SPEED PERFORMANCE
Air cleaner
·Clogged air cleaner element
Ignition system
·Fault spark plug
·Fault high tension cord
·Fault igniter unit
·Fault pick up coil
·Fault ignition coil
Valve system
·Improperly adjusted
·Valve clearance
POOR MEDIUM AND HIGH SPEED PERFORMANCE
Air cleaner
·Clogged air cleaner element
POOR SPEED PERFORMANCE
Ignition system Compression system
·Dirty spark plug ·Worn cylinder
·Improper heat range ·Worn or seized piston ring
·Faulty igniter unit ·Cylinder head gasket broken
·Faulty pick up coil ·Cylinder gasket broken
Fuel system ·Carbon deposit build up
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