Powervalve servo jittering

[jools]

My PV servo self-tests properly when ign is turned on, I have replaced the cables and adjusted with correct free-play, and the valve itself turns freely - no 'binding'.
But the servo motor 'jitters' (with the motor not running) ... no actual movement of the output, but it's like a vibration/buzzing noise. Is this normal? Is the unit servicable? I've seen similar jittering with RC servos which can be down to dirty pots (wipers?) inside.
Cheers,
Jools

[EPApolice]

My RZ500 did that when I got I and even though the cables were free and not binding I reset them anyway and the problem went away.

[jools]

Mate, thanks for your quick response. I'll run it and keep an eye on it. The bike has sat for quite a few years so it's quite likely that a bit of use might 'clean up' the servo motor.
Cheers,
Jools

[peet]

I also had this on on my 500
Rebuilt motor . Povervalves were smith to move
Adjusted it cleaned it nothing work
Replaced battery all ok
Put old back in & it came back .
Put bat charge on & turned on bike all good
Battery ran lights & even running jutted
Back to new battery

Peet

[jools]

Ah that's interesting Peet, my battery is pretty tired, won't hold a charge for very long, -a new battery may help -good tip.
Cheers,
Jools