I created a new simulation project called 'Motorcycle Part':
Pieza de motocicleta
More of my public projects can be found here.
For a tetrahedral mesh you need to have a solid, which in your case is missing. Please have a look at [this] (Can a tetrahedral mesh be created using geometry with only shells/faces?) forum post.
Hope this helps. If you have any question/s, feel free to ask.