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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. The issue surrounds the EPA’s new methodology for measuring exhaust noise levels, which now involves taking the measurement at a percentage of the total rev range, instead of a specific rpm value.

The result is that 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. The byproduct of lowering the rev-limiter will reduce the new ZX-10R’s maximum power output, but Kawasaki isn’t saying by how much.

Immediately after the launch of the 2011 Kawasaki ZX-10R, which claimed a 207hp figure at the crank with ram-air (197hp sans the air), rumors began to swell that the new ZX-10R’s peak performance figure would be drastically less in the American market. Apparently and supposedly due to federal regulations by the EPA, Kawasaki will be lowering the rev-limiter on the 2011 Kawasaki ZX-10R in order to comply with US government provisions.

Whether those rumors are in regards to the ZX-10R’s emissions or noise levels at that rev range is unclear at this time, but speculation that the power decrease is due to the new 10R’s peak power figure being north of 200hp are completely unfounded (Editor’s note: the United States has no provisions, at both the state and federal level, that cap motorcycle horsepower performance levels from the factory). We’ve reached out to Kawasaki for an official response on the issue, more as we get it.