The following is a list of Trans-AMA Champions, from 1970 to 1978. The championship was an international series established by the American Motorcyclist Association

American Motorcyclist Association

The American Motorcyclist Association is an American not-for-profit organization of more than 300,000 motorcyclists that organizes numerous motorcycling activities and campaigns for motorcyclists' legal rights...

 as a pilot event to help establish motocross in the United States. The series was based on a 500cc engine displacement

Engine displacement

Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...

 formula, although the first year of the event featured both 250 and 500cc events. The races run on American tracks to international standards, featuring the top riders from the F.I.M.

Fédération Internationale de Motocyclisme

The Fédération Internationale de Motocyclisme is the governing body of motorcycle racing. It represents 103 national motorcycle federations that are divided into six regional continental unions....

 world championship against the top American riders. In 1970 and 1971, the highest placing American rider at the end of the series was considered the A.M.A.

American Motorcyclist Association

The American Motorcyclist Association is an American not-for-profit organization of more than 300,000 motorcyclists that organizes numerous motorcycling activities and campaigns for motorcyclists' legal rights...

 national champion.

By 1978, American riders had improved to the point where it became more of a challenge for European riders to secure an easy victory. Since riders were paid based upon their results rather than starting money paid in European races, fewer European riders were motivated to make the costly trans-atlantic voyage. After 1978 the series was renamed the Trans-USA series, but had fewer European riders participating. The Inter-AMA series was a similar year-end championship, but used a 250cc engine displacement formula.

Trans-AMA champions

Year	Rider	Country	Machine
1970 1970 Trans-AMA motocross series The 1970 Trans-AMA motocross series was an international series established by the American Motorcyclist Association as a pilot event to help establish motocross in the United States. The motocross series was an invitational based on a combined 250 and 500cc engine displacement formula, run on...	Dave Nicoll	United Kingdom	BSA Birmingham Small Arms Company This article is not about Gamo subsidiary BSA Guns Limited of Armoury Road, Small Heath, Birmingham B11 2PP or BSA Company or its successors....
1971 1971 Trans-AMA motocross series The 1971 Trans-AMA motocross series was the second annual international series established by the American Motorcyclist Association as a pilot event to help establish motocross in the United States. The motocross series was an invitational based on a 500cc engine displacement formula, run on...	Sylvain Geboers Sylvain Geboers Sylvain Geboers is a Belgian former professional motocross racer and current motocross team manager.Geboers was one of the top motocross racers of the late 1960s and early 1970s, finishing in the top three of the F.I.M. 250cc motocross World Championships for five consecutive years from 1968 to...	Belgium	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1972 1972 Trans-AMA motocross series The 1972 Trans-AMA motocross series was the third annual international series established by the American Motorcyclist Association as a pilot event to help establish motocross in the United States. The motocross series was an invitational based on a 500cc engine displacement formula, run on...	Åke Jonsson Åke Jonsson Åke Jonsson born October 5, 1942 in Hammerdal, was a Swedish motocross racer. He was also a very skilled speed skater, and belonged to the Swedish top junior elite, before his racing career took off...	Sweden	Maico Maico For the manga series, see Maico 2010.Maicowerk A.G. was founded in 1926, originally assembling 98 and 123 cc Ilo two stroke motors. After World War II the West German motorcycle manufacturer began producing its own unit construction two stroke engines, selling engines and complete motorcycles...
1973	Adolf Weil Adolf Weil (motorcyclist) Adolf Weil was a German motocross racer. He competed in the FIM 250cc and 500cc Motocross Grand Prix world championships as a rider for the Maico factory racing team during the 1960s and 1970s....	West Germany	Maico Maico For the manga series, see Maico 2010.Maicowerk A.G. was founded in 1926, originally assembling 98 and 123 cc Ilo two stroke motors. After World War II the West German motorcycle manufacturer began producing its own unit construction two stroke engines, selling engines and complete motorcycles...
1974 1974 Trans-AMA motocross series The 1974 Trans-AMA motocross series was the fifth annual international series established by the American Motorcyclist Association as a pilot event to help establish motocross in the United States. The motocross series was an invitational based on a 500cc engine displacement formula, run on...	Roger De Coster	Belgium	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1975	Roger De Coster	Belgium	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1976	Roger De Coster	Belgium	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1977	Roger De Coster	Belgium	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1978	Bob Hannah Bob Hannah Robert "Hurricane" Hannah was one of the most successful motocross racers in American history. He won a total of seven AMA national championships....	United States	Yamaha Yamaha Motor Company , is a Japanese motorized vehicle-producing company. Yamaha Motor is part of Yamaha Corporation and its headquarter is located in Iwata, Shizuoka. Along with expanding Yamaha Corporation into the world's biggest piano maker, then Yamaha CEO Genichi Kawakami took Yamaha into the field of motorized...

Trans-USA champions

Year	Rider	Country	Machine
1979	Kent Howerton Kent Howerton Kent Howerton was one of the top American motocross racers in the 1970s and 1980s. He won three AMA national championships....	United States	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1980	Kent Howerton Kent Howerton Kent Howerton was one of the top American motocross racers in the 1970s and 1980s. He won three AMA national championships....	United States	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...
1981	Broc Glover Broc Glover Broc Glover was a leading motocross racer in the 1970s and early 1980s. Glover earned six AMA National Motocross Championships, a record which stood for nearly 20 years until 2003, when Ricky Carmichael finally eclipsed the mark...	United States	Yamaha Yamaha Motor Company , is a Japanese motorized vehicle-producing company. Yamaha Motor is part of Yamaha Corporation and its headquarter is located in Iwata, Shizuoka. Along with expanding Yamaha Corporation into the world's biggest piano maker, then Yamaha CEO Genichi Kawakami took Yamaha into the field of motorized...
1982	Dave Hollis	United States	Yamaha Yamaha Motor Company , is a Japanese motorized vehicle-producing company. Yamaha Motor is part of Yamaha Corporation and its headquarter is located in Iwata, Shizuoka. Along with expanding Yamaha Corporation into the world's biggest piano maker, then Yamaha CEO Genichi Kawakami took Yamaha into the field of motorized...

Inter-AMA champions

Year	Rider	Country	Machine
1971	Vlastimil Valek	Czechoslovakia	CZ Ceská Zbrojovka Strakonice Česká zbrojovka is a Czech firearms manufacturer also known for making ČZ motorcycles. ČZ was established as a branch of the Škoda Works Armament in Strakonice, Czechoslovakia in September 1919.-History:...
1972	Gary Jones Gary Jones (motorcyclist) Gary Jones is an American former professional motocross racer. He won the first three AMA 250cc Motocross National Championships, riding three different brands of motorcycles, a feat that has never been repeated....	United States	Yamaha Yamaha Motor Company , is a Japanese motorized vehicle-producing company. Yamaha Motor is part of Yamaha Corporation and its headquarter is located in Iwata, Shizuoka. Along with expanding Yamaha Corporation into the world's biggest piano maker, then Yamaha CEO Genichi Kawakami took Yamaha into the field of motorized...
1973	Heikki Mikkola Heikki Mikkola Heikki Antero Mikkola was a four-time World Champion motocross racer. Known as the "Flying Finn", and characterized by a fierce, determined style, he was the first Finn to win a motocross world championship....	Finland	Husqvarna Husqvarna Motorcycles Husqvarna Motorcycles, a subsidiary of BMW, is a company manufacturing motocross, enduro and supermoto motorcycles. The company began producing motorcycles in 1903 at Huskvarna, Sweden, as a branch of the Husqvarna armament firm which had supplied the Swedish army with rifles since 1689.-History:As...
1974	Zdenek Velky	Czechoslovakia	CZ Ceská Zbrojovka Strakonice Česká zbrojovka is a Czech firearms manufacturer also known for making ČZ motorcycles. ČZ was established as a branch of the Škoda Works Armament in Strakonice, Czechoslovakia in September 1919.-History:...
1975	Tony DiStefano Tony DiStefano Tony DiStefano was a top motocross champion of the 1970s. He won three AMA 250cc National Motocross Championships....	United States	Suzuki Suzuki is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...

See also

• List of AMA motocross national champions
• Supercross World Championship
• Motocross World Championship