Can someone explain how these two crank trigger sensors on the front cover work, which one controls the leading and which one is the trailing.

 

these are just magnetic sensors i think. not sure which one controls which

 

The N and G signals go into the ECU so the the ECU 'knows' the crank position of the engine, (i.e. 90 degrees). The G happens once per rotation basically and index. The N happens every 60 degrees of rotation. The ECU resets the degree counter when the G pulse, (index) happens and then increments to the next 60 degrees for each N pulse.
0 - 60 - 120 - 180 - 240 - 300 - 360 - 420 - 480 - 540 - 600 - 660 - 720/0
Being a 4 cycle engine there are 720 degrees to keep track of.

So with the ECU knowing the engine position it can then fire the leading / trailing coils at the correct engine position.

 

now i get it ,wish i had posted this earlier.

 

A two rotor should only need to keep track of 360º.
At 0º it fires the one rotor, and at 180º it fires the other rotor.

720º is for a four cycle piston engine.

 

But... for every full rotation of a rotor, the crank shaft has rotated 3 times. So, you would need to keep track of more than a single rotation.
I would like to know what NE and G stand for. I have looked in the manual several times with no luck.

 

Now it gets even more complicated.

 

This would only be true if the ECU had to do something different for each rotor face. Otherwise, refer to my first post in this thread.