Americans Mike Healey and Trampas Parker went 1-2 at the Dutch FIM Motocross World Championship 125cc Grand Prix. Healey went 1-2 while Parker went 3-1. Both were on KTMs. Series points leader Davey Strijbos of Holland finished third overall. Yet another American on a KTM, Bob Moore, finished fifth overall.
With series favorite Jean-Michel Bayle just getting back to the starting gate after breaking his arm a month earlier, the door was open for Michele Rinaldi, who finished 1-3 to get the overall win on his Suzuki. American rider Broc Glover, now on a KTM and in Europe for his last racing season as a professional, scored second overall with 8-2 finishes. Bayle ended up winning the second moto after a first moto DNF, salvaging fifth overall. He would later go on a hot streak and win eight of the next ten GPs to snatch the 1989 FIM 250cc World Championship.
The Southwick AMA 125/250 National was swept by Team Yamaha, which was having a dominant year. Broc Glover, the defending 125 National Champion, topped Kawasaki’s Gaylon Mosier and Suzuki’s Brian Myerscough in the 125 Class, and Bob “Hurricane” Hannah led his veteran teammate Pierre Karsmakers in the 250 Class. This was the last season for Karsmakers, a Dutchman who would move to America in 1973 and become that year’s AMA 500cc National Champion, as well as the first AMA Supercross Champion one year later. This runner-up finish at Southwick, however, would mark his last podium as a professional racer.