TT star Ian Hutchinson has pleaded guilty to speeding and driving without due care and attention.
Deputy High Bailiff Jayne Hughes banned Hutchinson from driving for three months and fined him £850 for the offences.
Hutchinson, aged 33, of Guiseley, Leeds, pleaded guilty to driving at a speed of 75 mph in a 30mph residential zone.
Camera footage of the incident was shown during the court case on Thursday.
The court heard that the rider was driving an unlicensed Yamaha quad bike on Saturday. June 1.
Prosecutor Justin Bullas, who stated that Hutchinson has now lost his good character, told the court that around 2.25pm during the TT race period a police officer was on a unmarked motorbike along King Edward Road, Onchan travelling in the direction of Laxey.
The officer was in a queue of traffic, when the queue had to stop and wait for a car ahead to turn into Sea Cliff Road.
The car waiting to turn was delayed from doing so by oncoming traffic.
The police officer then noted in his rear view mirror that the defendant was travelling up behind the stationary vehicles and then overtook the stationary queue of traffic.
After the car cleared the junction Hutchinson accelerated rapidly travelling towards the Groudle area.
In the meantime the police officer operated his convert camera system on his bike.
While in the residential area the defendant accelerated up to a speed in excess of 75mph in the 30mph zone.
The officer matched the speed of the quad and noted that Hutchinson’s speed did not slow down until it came behind a slower moving car.
The court heard that, as the defendant overtook the slower car, he accelerated sharply towards the old left hand side Howstrake bend.
On the approach to the bend Hutchinson moved onto the opposite carriageway and overtook a car travelling in the same direction.
The prosecutor Mr Bullas told the court that during the manoeuvre ‘there was no afforded view to the defendant of any oncoming vehicles’.
Hutchinson, who has won eight TT races, moved the quad back into the nearside approximately mid bend cutting across the front of the slower-moving vehicle.
The defendant was later interviewed by police, he denied riding over 60mph as the quad was restricted to 60mph by gearing.
He admitted the speeding but said that he had not put anyone in danger when he over took at Howstrake bend.
His advocate, Darren Taubitz, told the court that Hutchinson did not think he was travelling the speed that the unmarked police bike recorded and that he was an experienced rider.
The defendant claimed he could see if there was any oncoming traffic coming because he had a good view on the quad.
The court heard that Hutchinson felt intimidated by the bike following him and thought that the bike was either trying to race him or get to him.
Mr Taubitz added that Hutchinson could have asked for more investigations into the speed he was travelling because the camera did show the exact speed, but he wanted the case to be dealt with on the day.
The court heard that Hutchinson was genuinely remorseful and extremely embarrassed and ashamed to be in court.
Mr Taubitz added that the defendant ‘had taken this very much to heart’.
‘He loves the TT and puts a lot of effort into promoting the event in the UK and Europe. He made a stupid mistake and wishes he could turn back the clock.’ said Mr Taubitz.
He continued: ‘He loves motor racing and the sport and would not want to do anything to damage it.’
Mr Taubitz added: ‘This is a one-off incident that will never be repeated by him, on an open road. He will leave his speed for the race track.’
The prosecutor withdrew a charge of dangerous driving and speeding.
The Deputy High Bailiff gave Hutchinson credit for his early guilty pleas and co-operation with police.
Mrs Hughes told Hutchinson that it was a serious offence because he was 45 miles per hour above the speed limit. Mrs Hughes said it was ‘unfortunate’ that he was now in this position and that he ‘should know better’.
She gave him credit for having the case dealt with on the day, which saved a lot of court, police and investigation time.
The Deputy High Bailiff accepted that Hutchinson was an experienced driver, but she couldn’t ignore the speed he was travelling, she said: ‘The speed on that road was excessive to say the least.’
Mrs Hughes pointed out that after watching the footage, ‘it was not just a quick incident, it carried on for some period of time.’
She told the defendant that he not only put himself in danger but other people were at risk.
Hutchinson was also ordered to pay £50 prosecution costs.