The first thing touched was the motor, fitted with a Big Bore Stroker Kit. Developed in collaboration with Suzuki's off-road racing team, the kit is designed to give the DR-Z some serious stomp, and is the same setup Kevin Schwantz used when he tried his hand at supermoto racing a few years ago. This punches out the bike's 398cc engine to 449cc by way of a 92mm piston (up from 90mm), Nikasil-coated cylinder and a stroked crank with a 5mm offset crankpin. A custom forged-aluminum piston features a repositioned wristpin to accommodate the new connecting-rod angles, and is stronger than stock to withstand dramatically increased piston speeds. The jug work boosts compression to a heady 13.5:1 (up from 11.3:1)-high enough for a significant power gain but still low enough to run on pump gas. Complementing the cylinder work are the billet ST-R high-lift cams and the Racing Igniter ignition module, which extends the ignition curve and raises redline to 11,000 rpm (stock is 10,000).