A man walked into a service station in Cooper Bridge and threatened staff with a gun.
Police have released an image of a man they would like to speak to following the robbery, which took place at about 5.20am on Sunday
The incident happened when a man walked into the service station in Leeds Road and made demands for cash.
The man produced what was believed to be a small hand gun and the assistant handed over a small amount of cash and cigarettes.
The suspect is described as white, believed to be in his late teens or early twenties, of slim build and about 5ft 11ins tall.
He was wearing a dark jacket with a motif on the left breast, dark/black Adidas-style tracksuit bottoms and gloves.
Detective Inspector Mark Truelove, of Kirklees District CID, said: “This man was wearing a black and red crash helmet, which had a distinctive design.
“He is believed to have travelled to and from the scene on a small red motorbike, possibly a 125cc, which was displaying an ‘L’ plate to the rear.
“We believe it was seen heading towards Mirfield, and would ask for anyone who recognises this man or the bike to contact Kirklees District CID on 101 or Crimestoppers anonymously on 0800 555111.”