Installed Kent fast road cam(Duration 276deg)

[JapS]

Hi everyone
My Japanese S3c engine started at last.
But engine will not rev up and that felling is so bad.
I checked plug which prove gas is lean.
I installed Kent fast road cam(duration276deg).
If anyone use this cam, please let me know how to tune engine feeing.
And do I need replase engine management system like full conputer like motec?

Thank you

[JapS]

Hi　thanks　a　lot.
I will check it again after work.