I just rebuilt a TC90 motor which included a complete NOS stator assembly. Runs great but I'm having an issue when I turn the key to the second position. All the lights work to include the indicator lights in the speedo. However, when I turn the key to the second position, the motor shuts off. If I rev it up pretty good, the headlight works but then the motor will shut off. With the motor off, and the key on, the horn, indicator lights brake and tail light work but no headlight. I start it up and all the same thing but now the headlight works, however, the motor then dies. The battery and rectifier are also brand new. The bike does continue to have spark in either of the two key positions. Humm. any ideas? Does anyone have a TC90 or TS90??

Please help

I didn't find the right solution from the internet.

Animated Explainer Video