Yes Thai mechanics do exist it's finding them.
To various degrees for better words they do a proffesion job.
As motorcycle engineer myself in my day I've only ever witnessed a very good mechanic actually going right through my Versys 650 engine he was a good kid and his mentor was a trained Kwacka engineer, situated at Nahkon Sawan.
The only other guy is the latest mechanic found in Phayao thanks to a member here.