kymco mo yup50 Service Manual

15

. ELECTRICAL EQUIPMENT

15-2

IGNITION SYSTEM

No spark at plug

Engine starts but turns poorly

• Faulty spark plug

• Ignition primary circuit

• Poorly connected, broken or shorted wire

—Faulty ignition coil

—Between A.C. generator and CDI unit

—Poorly connected wire or connector

—Between CDI unit and ignition coil

• Ignition secondary circuit

—Between CDI unit and ignition switch

—Faulty ignition coil

—Between ignition coil and spark plug

—Faulty spark plug

• Faulty ignition switch

—Poorly insulated plug cap

• Faulty ignition coil

• Improper ignition timing

• Faulty CDI unit

—Battery voltage too low (6V max.)

• Faulty A.C. generator

—Faulty CDI unit

STARTING SYSTEM

Starter motor won‘t turn

Lack of power

• Fuse burned out

• Weak battery

• Weak battery

• Loose wire or connection

• Faulty ignition switch

• Foreign matter stuck in starter motor

• Faulty starter switch

or pinion

• Faulty front or rear stop switch

Starter motor rotates but engine does

• Faulty starter relay

not start

• Poorly connected, broken or shorted wire

• Faulty starter pinion

• Faulty starter motor

• Starter motor rotates reversely
• Faulty starter clutch
• Weak battery