Petrol Additives to older Bike engines...?

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petri oosthuizen

Grumpy Mutt
WD Vendor
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Yamaha XT 600 Z
As above.
On older cars, some People add additives like Valve Ease or WM Penn etc etc to their petrol, to protect (I think) valves etc running on Unleaded.
Is this a good/bad "habit", adding that to a tank now and then?
Or is it a thing of "if it ain't broke don't fix it"...??
What say You?
I'm talking an old 1984 XT 600, and an old 1998 GS 1100
Thanks
 
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