The Harley-Davidson XG750R is a competition-only motorcycle made by Harley-Davidson for flat track racing. [1] It is powered by the fuel-injected, liquid-cooled Revolution X V-twin engine from the 2015 Harley-Davidson Street 750. It is the first all-new flat track racing motorcycle from Harley-Davidson in 44 years. [2]
It was first used in competition by Davis Fisher of the Harley-Davidson Screamin' Eagle Factory Team on April 9, 2016 in the GNC1 race at the AMA Pro Flat Track Circuit of the Americas Half-Mile. [3] The motorcycle was built by Vance & Hines, long known in motorcycle racing for their road racing and drag racing success. [4]
The XG has a number of changes from the older XR750, reflecting newer technology. [5]
| Attribute | XR750 | XG750R |
|---|---|---|
| Engine layout | 45-degree V-twin | 60-degree V-twin |
| Cooling | Air | Liquid |
| Fuel delivery | Carburetion | Injection |
| Valves per cylinder | 2 | 4 |
| Valve actuation | Pushrod | Single overhead camshaft |
| Crankshaft bearings | Roller | Plain |
| Connecting Rods | Fork and Blade | Conventional |
| Rev Limiter | No | Yes |
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Erik F. Buell is the founder, former Chairman and Chief Technical Officer of the Buell Motorcycle Company, which eventually merged with Harley-Davidson Corp. Buell is a pioneer of modern race motorcycle technology. Buell is also the founder of Erik Buell Racing.
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American Flat Track is an American motorcycle racing series. The racing series, founded and sanctioned by the American Motorcyclist Association (AMA) in 1954, originally encompassed five distinct forms of competitions including mile dirt track races, half-mile, short-track, TT steeplechase and road races. The championship was the premier motorcycle racing series in the United States from the 1950s up until the late 1970s.
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Brad Baker is an AMA Pro Flat Track Racer from United States who has competed in the Championship since 2009, winning the Grand National Singles Championship in his first full-time year. He also won the Grand National Championship in 2013.
Jake Johnson is an AMA Pro Flat Track Racer from the United States who has competed in the Championship since 2002, winning the Grand National Singles Championship in 2006 and the AMA Pro Grand National Championship in 2010 and 2011.
Joe Kopp is an American motorcycle racer. He has competed in the AMA Pro Flat Track Racing Championship since 1993, winning the AMA Pro Grand National Championship in 2000.
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The Harley-Davidson KR or KR750 was a 45.125 cu in (739.47 cc) displacement V-twin engine racing motorcycle made by Harley-Davidson from 1953 through 1969 for flat track racing. It was also used in road racing in the KRTT faired version. When the KR was first introduced, it dominated motorcycle racing in the United States. In 1970 it was replaced by the long-lived and US race-winning Harley-Davidson XR-750.
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Davis Fisher is an American professional motorcycle racer. He competes in the AMA Pro Flat Track championship since 2014, winning the GNC2 championship in 2015 and competing in the GNC1 Championship in 2016.
The Indian Scout FTR750 is a competition-only motorcycle engine made by Indian Motorcycle for flat track racing. It is a fuel-injected, liquid-cooled, four-valve-per-cylinder V-twin. A single-pin crankshaft riding on plain bearings carries side-by-side steel connecting rods. It is the first all-new flat track racing motor from Indian Motorcycle in decades.
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