The X3 (stylized as the X3) is an 800 cc V4 race bike built by Ilmor Engineering to compete in the 2007 MotoGP series.

McCoy exceeded expectations, putting in consistent performances to bring the Ilmor team their first two championship points and the first ever points awarded for an 800 cc capacity bike, though McCoy arrived last in both occasions, four and seven laps down respectively.

McCoy worked as a test rider for on the X3 development team and was expected to ride for Ilmor in 2007, but Andrew Pitt and Jeremy McWilliams were chosen instead.

[1] On 15 March 2007 after one race, the team announced that they were taking a break from Moto GP as a result of funding issues.

[2] On 30 April they announced that they would run a "slimmed-down" set-up focused purely on engine development, releasing all unnecessary personnel but keeping under contract riders McWilliams and Pitt.