Police have found a man's body in the Manukau Heads area which is believed to be that of missing man Timothy John Watkins.

The 58-year-old Manurewa man was last seen on Monday morning when he told a family member he was going for a ride on his motorbike.

His body was found this afternoon near the grey 2015 Triumph Thunderbird Storm (ABS) motorbike, Sergeant Gareth Brown of Counties Manukau police said.

Watkins was a Top Alcohol car racer and record holder. He set the fastest time in 2007 for the division in his Dodge Avenger Top Alcohol funny car with a 5.8-second pass at over 372km/h. He recorded two other 5-second passes on the day and won the Top Alcohol bracket.

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Police said they were conducting further inquiries to establish what has happened.