Officers say they have noticed an increasing number of riders making modifications to their mopeds so they can go quicker.
By law mopeds are supposed to go no faster than 30mph.
But teenagers have been spotted whizzing down roads at up to 50mph.
P
olice say many people don't even realise that altering a moped to make it go faster is actually illegal if the rider doesn't hold a full bike licence.
Officers held spot checks in Waterlooville to begin the clamp down.
Using a hi-tech piece of motorcycle testing equipment called a dynamometer, police tested the maximum speed of a moped at the roadside in just 12 seconds to confirm if it had been modified.
The three-hour operation was held in College Road and Apollo Drive – popular routes for moped riders to speed – with 46 riders being stopped by police.
Five riders had their mopeds seized as they had been modified, while a further five were fined £60 and given three points for speeding.
The operation was carried out by Cosham Roads Policing Unit and Hampshire Constabulary BikeSafe co-ordinator PC Mick Gear.
PC Mick Gear said: 'A lot of young riders under 17 years old don't realise that altering their mopeds to make them more powerful is not only illegal, but extremely dangerous.
'Modifying could mean the rider is breaching driver licence conditions and make their insurance policy void. This could have serious consequences if that person is involved in a crash.
'I would also urge those premises carrying out de-restrictions to mopeds belonging to those under 17 to stop. If you knowingly carry out a de-restriction to a moped belonging to someone of this age you are assisting them in committing offences.'
Police say they will be carrying out further operations this autumn as they aim to reduce the number of people killed or injured in accidents.
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