Not a user user name for tiger engine. For that try local mechanic or the is a Facebook page for tiger boxer 200 thailand post there.
It might be the magnet, or the coil responsible for generating the current for spark., or the ignition coil increases the voltage for spark, or might be the pulser coil. The pulser could tells your cdi unit when to fire. Check the pulser coil. Share pics someone might chime in.
Checking pulser coil is easy. I would recommend you Chek it first.
Check all connectors there might be some cable loose.