Based on Suzuki’s big-bore motocross technology but equipped for trail riding, the RMX450Z delivers stout performance with niceties such as electric starting, 12-volt lighting, and instrumentation. Although the RMX’s 499cc single shares its oversquare bore and stroke dimensions with the RM-Z450 racer, the tuning of the trailbike’s engine is noticeably different. It has a lower compression ratio and a smaller fuel-injection throttle body, mellowing the performance to make mastering difficult terrain easier. Somewhat surprisingly, its 1.6-gal. tank carries no more fuel than does the motocross bike, but the calmer tuning should translate to more miles between fill-ups.