Kawasaki USA has just announced that the mysterious stop-sale on the 2011 Kawasaki ZX-10R will be lifted, identifying the previously-mysterious fault as residing in the intake valve springs. As stated when the not-a-recall was announced on December 11, the problem isn’t related to safety, performance or the modifications made to reduce power for the North American market. Instead, Kawasaki says there were fears the intake valves could seat improperly, impacting engine performance. Before the new superbike king of the hill goes back on-sale, all units will benefit from new camshafts, valve springs and spring retainers. Kawasaki isn’t naming a precise date, instead saying sales will resume in, “late January.” Full details below.

The press release follows:

IRVINE, Calif. (Dec. 29, 2010)---Kawasaki Motors Corp., U.S.A. today announced that the recent sales hold placed on the 2011 Ninja® ZX™-10R sportbike is expected to be lifted in late January and that sales of the highly-anticipated unit will resume as normal.

According to Kawasaki engineers, the proactive sales hold resulted from a finding that indicated possible surging of the intake valve spring when the unit is operated under unique riding conditions, such as on a racetrack.  The surge could cause the intake valve to seat improperly, resulting in poor engine performance.

The camshaft, valve springs, and spring retainers are being replaced to prevent the valves from surging, without affecting engine performance.

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