Rear suspension upgrade k2 proflex beast

[98Beast]

hi guys ive got a k2 proflex beast, ive just bought a near new pair of front forks, but now the rear doesnt want to work with them, the front is set up for my weight, but the rear bottoms out on any jumps ect.
does any one know if there is a upgrade i can buy, i can get a spring that is the same size from a shop i know, but will that work?
im in vic australia, the picture of my beast is in the gallery, it would be good if someone could tell me the exact year of my bike to,
cheers josh

[bikendan]

that looks like a '98 beast. you may need a new spring or the shock may not have a charge. what do you weigh?
the only aftermarket shock for that bike is made by risse.
heres the link:http://www.risseracing.com/k2.shtml

[98Beast]

i weigh 200 pounds and im 6ft [smiley=coolfrown.gif]