Hyperpro springs install

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Boeloe

Pack Dog
Joined
Dec 29, 2006
Messages
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Location
Krugersdorp
Bike
Yamaha XT660
Spoiled myself to a set of Hyperpro springs (front & back) for the XT660R.
I see the kit come supplied with 1litre of 15W fork oil whereas the manual says 10W is standard. Will this not make the forks very harsh combined with the progressive springs?
Also will 1litre of fork oil be enough to fill both legs to 125mm from the top with inner tube pushed all the way down.

Sorry for the questions but this bike is new to me so i'm still learning.
 
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