Folkestone Magistrates' Court heard Kevin Chapman allegedly exposed his genitals and attempted sexual manoeuvres with the bike.
On the same day, it is also alleged the 33-year-old punched and kicked the same Blue Suzuki motorbike in Canterbury, Kent.
The alleged mechanophiliac claims he remembers dropping his trousers, but denied exposing himself and 'grinding' the vehicle.
He also denied kicking and pushing the motorbike and claimed he was pushed into it by homeless people.
Chapman, from Ashford in Kent, pleaded not guilty to indecent exposure and causing criminal damage to the bike at Folkestone Magistrates' Court on Wednesday.
The court heard Chapman had 'no recollection' of indecently exposing himself on March 27.
Chapman was said to be receiving treatment, had something to drink and overdosed on the day of the allegation, the court heard.
He will face a trial at the same court on June 13.
In a separate case, Chapman also appeared at the same court for sending obscene messages on January 2 and pleaded not guilty.