A red Mazda 6 and a Sur-Ron electric motorcycle were involved in the collision on Bigyn Road, Llanelli.
The male rider of the motorcycle was taken to hospital with injuries not believed the be life threatening.
The driver of the vehicle stopped and spoke to rider however left the scene before police arrival.
Enquiries are ongoing to identify the driver.
Anyone with information that could help officers with their investigation is asked to report it to Dyfed-Powys Police, either online at:
https://bit.ly/DPPContactOnline, by emailing 101@dyfed-powys.police.uk, or by calling 101. If you are deaf, hard of hearing, or speech impaired text the non-
emergency number on 07811 311 908.
Quote reference: 359 of the 29th
Alternatively, contact the independent charity Crimestoppers anonymously by calling 0800 555111, or visiting crimestoppers-uk.org.