Dirt Bike Duels

Rick puts the pedal to the metal when NASCAR driver Greg Biffle asks him to restore his 1970s Montesa motorcycle. Can Rick steer this speed demon dirt bike to the finish line or will this muddy motorbike wipe out before the checkered flag? And later, the shop drives forward on a 1950s Kidillac. Can they keep this classic kiddie car cruising or will they need to swiftly step on the baby brakes?