Sales hold placed on the 2011 Ninja® ZXTM-10R sportbike
"Apparently under certain conditions there is the possibility of seating problems for the intake valves which is requiring the cams, springs and spring retainers to be replaced. The official release is below.
Kawasaki Motors Corp., U.S.A. today announced that the recent sales hold placed on the 2011 Ninja® ZXTM-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.""