POLICE have warned parents that mini-motorbikes cannot be used on roads and pavements.
But a Huddersfield karting company now holds special sessions for the tiny bikes.
Huddersfield Indoor Karting is staging the sessions at the old David Brown factory on Meltham Mills Road in Meltham on Wednesdays, from 4.30pm to 9pm, and Sundays, from 4.30pm to 8pm.
But owner Steve Rees has urged people to think very carefully before buying the mini-bikes and not buy cheap imitations.
"The chances are if you are paying below £500 you are buying a sub-standard cheap import," he said.
"Quite simply, some of them are not safe. We have had people riding new bikes here and the front forks have fallen off on the first lap.
"We would urge anyone thinking of buying a mini-motorbike to take advice from people with experience and it is also vital they buy all the proper gear such as knee and elbow protectors."
Huddersfield Indoor Karting has been holding the sessions for the last five months and hopes to start organising race meetings soon.
Those taking part range from six-year-olds up to people in their 60s.
Mini-motorbikes are not road-legal and can only be ridden on private land with the landowner's permission and not on roads, pavements and public places such as parks. Anyone caught breaking the law by police faces a fine and having the bike confiscated.
Sgt Paul Hepworth, of West Yorkshire Police, said: "The bikes are not registered with the DVLA, they cannot be MOT-tested, taxed or insured, so they are never going to be road-legal.
"If they are used in parks it could cause annoyance, alarm and distress and the police will have the power to seize the vehicle."
He added: "The only place the vehicle can legally be used is on private land with the permission of the land- owner."