Is it bad to turn the engine on and off frequently

[yebo]

Pero ano po yung na wear na parts pag nag iistart ng engine? Spark plug?

1. Battery
2. Starter motor carbon brush, solenoid contacts and starter pinion gear. Yung carbon brush madali lang palitan. Most starter solenoids are now sealed type so palit yan buo. Also the pinion pag nabungi or worn out palit na agad at baka kasi madamay ang flywheel gear.