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]
| 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 |