Quote:
Originally Posted by jkv45
If you decide to rebuild that engine I would first confirm what caused it to happen so your fresh engine won't experience the same fate.
I initially had no idea what caused the valve to hit the piston on our engine (bought it damaged), but after some research and close inspection found that the hub for the cam gear is pressed onto the cam and had rotated, allowing the valves to get out of time.
The Ninja's cam isn't attached in the same manner, but something caused the two to connect.
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I'm not sure if I'm going to rebuild this engine. I may swap it with a newgen one. I believe that this valvetrain design with the rockers being free to pop from their place, is really stupid for such a high rev engine. I believe that's the reason Kawasaki changed this design on the newgen. IIRC Nissan sr20det engine has a similar valvetrain design with rocker arms. Same problems there. If the engine over revs , rocker arms will pop