I am currently modelling a bike based on a Norton 961:
I struggle with modelling a proper mechanical spring. It should look like this, I think:
I really don't know how to make it look flowing and natural and having enough "layers".
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Activate the Add Curve: Curve Extra Objects addon in the user preferences if you haven't yet.
Then just add a new 3D object with Shift + A Add > Curve > Curve Spirals > Logarithmic or Archemedian in you prefer.
Adjust the desired height and number of turns as required.
Adjust curve bevel factor from the Properties Window > Object Data (Curve) as desired and set the Fill option to Full.
You can then manually add the "flat" end loops manually by joining in a bezier curve circle object afterwards in Edit Mode.