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TE 250 (2010 - X-lite) Question

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Am currently rebuilding a TE 250 for a friend of mine. It's a fuel injected model and when I was setting the timing something occured to me.

How does the Mikuni ECU know when the piston is at TDC on the compression stroke versus when it is at TDC on the exhaust stroke ?

I know these engines are wasted spark so it sparks on the exhaust stroke too, but how does it know when to inject the fuel ? There are no cam sensors on this bike so how does it always inject fuel during the intake stroke rather than during the power stroke ?

(A carburettor is old school and simple and only delivers fuel when air is drawn through it (i.e. during the intake stroke).)

Anyone got any ideas ??

 

Thanks

 

 

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