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We just got off the phone with Kawasaki HQ, and it’s official: the 2011 Kawasaki ZX-10R will inadvertently get a power decrease when it comes to the United States because of the EPA’s regulation of noise pollution, confirming earlier rumors from this week. Because of the EPA’s new methodology for measuring exhaust noise levels, the 2011 Kawasaki ZX-10R passes the Euro III standards, but fails the EPA standards in its unadulterated form. To come into compliance with the EPA’s Noise Control Act, Kawasaki has lowered the rev-limit on the 2011 Kawasaki ZX-10R by 750 rpm in order to meet the new criteria.

According to Ash on Bikes, BMW has added a firmware patch to the S1000RR that will set the bike’s rev limit to 9,000 RPM during the first 600 miles of use. This limit is reportedly being put into place because of excessive wear on components being used by race teams. As such, BMW thinks it fit to guard against similar wear on its street-bound machines, although there has been no indication that this has been the case.