Longest stoppie (nose wheelie) on a motocross bike

According to Official Guinness Records,

The longest nose wheelie on a motocross bike was 86.2 m (282 ft 10 in) achieved by Gary Harding (USA) at Mason-Dixon Dragway in Boonsboro, Maryland, USA, on 22 August 2010. Harding rode a Kawasaki KX250T8F model for the attempt.
Immediately after the attempt, Harding proposed to his girlfriend on the very same track. She quickly answered yes.

For a complete list of 2010 records, please visit 2010 Guinness Records in United States.

Other United States records that might interest you:

• Longest chain of shoes
• Fastest mile on a space hopper
• Largest boat tie-up
• Heaviest sumo deadlift in one hour (female)
• Most R&B no.1s in the US
• Largest game of gaga ball
• Fastest lunge mile - men
• Largest collection of personal scrapbooks
• Youngest person to hit 600 home runs in a Major League Baseball career
• Fastest aircraft, civil