Hi David,

sorry for the late answer.

Which spring are you talking about? The one I marked in the attachment?

If it´s the one I didn´t find any part-no. Neither in ETKA nor in ETOS.

Normally there is no loss of tension, even after 300.000 km.

My guess is: lack of lubrcant/oil etc and, may be, an old and "stiff" throttle cable.
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Tach, Berthold "Wer noch klagen kann hat noch nicht alles verloren"