The servo is generally a reliable part. The cables too don't tend to stretch, as thereis alomst zero force applied, until the valve becomes choked wih carbon.
When that happens the motor draws more current, and the PGM unit is usually the first part to fail.
I'm not sure on the MC16 though, as it was slightly different to the later bikes - I believe the ignition unit and servo unit are seperate parts.
Matt? Andy?
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