1987

It was the FIM 250 Grand Prix of Great Britain at the famous Hawkstone Park, featuring Eric Geboers. The Honda HRC factory rider seemed to have the first moto in hand before an apparent crash left him with a broken bike, but Geboers came storming back to win the second moto as he closed in on the 250cc World Championship. The overall winner would turn out to be Finland's Pekka Vehkonnen, whose sister Karina would become the wife of none other than Roger DeCoster.

1980 

AMA Supercross visited Kansas City for the first time, and Suzuki riders Kent Howerton and Brian Myerscough went 1-2 at Arrowhead Stadium. Series points leader Mike Bell of Team Yamaha finished third, followed by his teammate Donnie Cantaloupi and a trio of Honda riders: Donnie Hansen, Chick Sun, and Steve Wise.

1981

One year later, there was an AMA 125/250 National at Road Atlanta, and Kent Howerton won there as well—only now Yamaha's Bob "Hurricane" Hannah was back from a year off with a broken leg and finished second. Honda's Donnie Hansen placed third, and the ageless Gary Semics finished fourth on a Suzuki. 

In the 125 class, Suzuki's Mark "Bomber" Barnett was the winner, Kawasaki's Jeff Ward was second, Honda's Johnny O'Mara third, and two very exciting rookies rounded out the top five: Kawasaki's Tom Benolkin and Yamaha's Ricky Johnson. 

The Road Atlanta race was promoted by Bill West, and he almost had to cancel due to a drought making for very dusty conditions. But on the morning of the race, a light rain helped water the track. The race marked the return of longtime Southeast referee Freddy Ephram, who had suffered a heart attack. "I'm an old single man, but you all are my family," Ephram told everyone during the riders' meeting, according to Cycle News reporter Tom Mueller. 

1992

American motocrosser Donny Schmit swept all three motos of the German FIM 250cc Grand Prix, catapulting him into contention for the world crown. The Chesterfield Yamaha rider had been pretty much shut out in the first three rounds of the series, but the 1-1-1 in Germany was preceded by a 1-1-1 in Italy, and just like that, Schmit was even with Italy's Alex Puzar, who was also aboard a Yamaha. It was at this race that early points leader Stefan Everts of the Bieffe Suzuki team was injured, ruining his title hopes. 

1998

Glen Helen kicked off the AMA's 1998 Motocross Championship, and Suzuki's Mickael Pichon took the 250cc win with a 5-1 score to Yamaha-mounted Jeremy McGrath's 1-5. Factory Connection Honda's Mike LaRocco was third overall.

In the 125cc Class, defending champion Ricky Carmichael got off to a fast start on his Splitfire/Pro Circuit Kawasaki, topping the Yamaha YZ125s of John Dowd and Jimmy Button. 

Here is some home video:

1986

Team Honda's Ricky Johnson won the Tempe Supercross outside Phoenix, topping Kawasaki's Ron Lechien and his Honda teammate Johnny O'Mara. Kawasaki's Jeff Ward, the defending series champion, finished fourth. The win was enough for Johnson to clinch his first AMA Supercross title. 

The 125 class was won by Honda rider Willie Surratt, with Arizona's own Robert Naughton a popular second, also on a Honda.