Honda SH125 Manual page 327

ELECTRIC STARTER
Starter motor turns engine slowly
Low battery voltage
Poorly connected battery cable
Poorly connected starter motor cable
Faulty starter motor
Poor connected ground cable
Starter motor turns, but engine does not turn
Faulty starter clutch
Damaged or faulty starter drive gear
Starter relay
"CLICK",
but engine does not turn over
Crankshaft does not turn due to engine problems
19-5