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. 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. Itâ¿¿s no secret that Champions Choose Suzuki!