you will need a caliper. measure stock height - distance between the triple clamp and the top of the fork legs.
then,
first lift the bike(front tire cannot touch the floor), then you will have to loose(NO need to remove them completely) the the screws from the steering head (upper and lower - part that hold the Fork leg) and raise the fork leg SLOWLY and keep measuring until you get 6.5mm of distance. Re-torque the screws and take a ride. You can increase or decrease the distance between the triple clamp and the top of the fork legs, it depends how's your bike ride.
I have a Nitron shock on the rear and is already adjusted for my weight.