2011 SUZUKI RM-Z450, For 2011 Suzuki has taken the reigning FIM/AMA Supercross Championship winning RM-Z450, and have fine-tuned it into an even more potent machine. The 2011 RM-Z450 has undergone numerous updates: It now meets a stricter AMA noise limit (94 decibel) while keeping smooth engine output the compression ration has been increased from 12.2:1 up to 12.5:1 for higher output intake and exhaust timing has been changed for better engine feeling with lower noise output and ECU settings have been updated for more linear acceleration and improved over-rev. In addition, Suzuki has also focused on making tuning and maintenance easier on the 2011 RM-Z450 two optional couplers come with the unit to change the EFI setting (richer and leaner), and a convenient fuel line cap is included for regular maintenance. p What you have with the 2011 RM-Z450 is a cutting-edge open-class motocross ride that's more potent than ever. As a racer, you want quick, laser-accurate steering and confidence-inspiring high-speed handling in one package. And you want a high performance machine with a racing pedigree that enables it to be competitive right out of the crate. Here in the U.S. and around the globe, the RM-Z450 has helped racers collect wins and trophies, fiercely competing in venues from the World MX1 series to America's AMA Supercross championship. It's no secret that Champions Choose Suzuki!