2015 Suzuki RM-Z450, - - The RM-Z450 continues to evolve for 2015, delivering a higher level of performance while maintaining the great balance of the current model. The 449cc 4-stroke liquid-cooled DOHC 4-valve fuel-injected engine along with new performance upgrades straight from the factory is the reason why champions choose Suzuki! Champions Choose Suzuki...and Suzuki supports future champions! In addition to all the high-tech features and race-winning performance of the 2014 RM-Z models, Suzuki offers the best amateur racing program around!