anyone can help me to make a rev limiter, my motorbike uses cdi
CDI pretty easy to work with and control.
I would install a depletion mode FET on the trigger wire.
Then build a voltage divider and tap onto trigger wire right before the FET and go into a digital pin.
Loop of code that compares the pulse on the digital pin, and if it exceeds some rate, sends output to the depletion mode FET so that it stops the trigger signal from going to the CDI unit.
Once pulse rate drops to acceptable level, turn off output, allowing FET to close and spark to resume.
Can you share the code
Hi,
Welcome to the forum.
Have you googled arduino tacho
Tom... 
Put a travel stop screw on the throttle.