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which has the two nec alloy contol boxes under the seat?


The later electronic Ignition TAI type engines




The CDI engines have a Black/Silver or Gold box on top of the rear guard under the seat just back from the Airbox.
 

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Is the tai a wasted sprark system?


Both CDI and transistorized CX`s have a wasted spark ignition system because they both get their timing pulses form the crankshaft not the camshaft.

The crankshaft doesn`t know whether it`s on the exhaust or compression stroke so you get the spark plug firing every time the crankshaft-mounted firing doo-dah sweeps past the pulser - once every crankshaft rotation/twice per four stroke cycle.

Cars for example have distributors which run at half engine speed/off the camshaft so each plug only fires once for a particular cylinder and thus do not have a spare spark system.



I think i`m right in saying the CX Turdo`s have the ignition pulser plate and the triggering `pip` mounted on the camshft (in a separate housing behind the water pump) so they also do not use the spare spark ignition. I suppose that extra spark during valve overlap at the end of the exhaust stroke is undesirable on the blown CX engine?
 

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thats my take as well Eurovee.

and the reason the cam cant be 180d out
 
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