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bike will start and run only if i keep the starter button pressed as soon as i release the starter button the spark stops and the bike conks out please help
 

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I do not have a schematic, but this reminds me of cars of yesteryear with a ballast resistor.
When starting, 12 volts went to coil, but when started, circuit went thought a resistor to reduce voltage to points and condenser.
If symptoms same as yours, ballast resistor failed.

What can you advise about 125 circuitry/coil?
Any mods to your stop/run switch circuit?
 

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Discussion Starter #3
thank you for the advice i am not good at electrics but i will check this out, thanks again
 

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bike will start and run only if i keep the starter button pressed as soon as i release the starter button the spark stops and the bike conks out please help
Hello,
There must be a ground in the electrical circuit ...
Is the neutral indicator light on ?

Check the circuit in "black color" In the surrounding area on the diagram, (Sorry the schema text is in french)
Coupure masse  Allum CDI TW125.jpg

The wiring diagram of the TW125

Schéma ignition TW125.jpg
 

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See manual PDF pages 196 and 197 for schematic and component list.
 

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I skimmed what seemed to be pertinent parts of the manual (your TW125 may differ) and found no reason for it to crank and start if safety switches are not operating,
PDF page 200 ignition circuit
206 neutral switch
207 ignition cutoff relay
208 side stand switch
210 start systgem
215 start circuit

Still looking for a TW125 manual
 

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