there are 2 ignition units on the '16, located behind the headstock. The servo control unit is seperate and located in the tail just infront of the rear light.

I think that the servo on the '16 runs in the opposite direction to those on later models and from looking in the parts manual it doesn't seem interchangeable.

like alannsr250 says, if it ain't broke don't fix it.
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it's a name, not a condition