I would adjust the screw, First drain all your case oil at the drain plug then with the radiator cap on tight remove the hose going in to your case, keeping the cap on reduces mess, when you get the hose off and secured over a drain pan or bottle remove the radiator cap releasing the rest of the fluid. Then remove your footpeg kick starter ect. so you have a clear shot at your side cover,after you get the side cover removed you will see a screw in the middle of your pressure plate with a lock nut on it, loosen the lock nut (normal threads) and turn the screw in to take slack out of your clutch or out to increse slack when you get the adjustment your lookin for tighten down the lock nut and reassemble, oh and be sure to check all your gakets and o rings for wear and tear, for sure the little o ring on the post that connects to the water hose on the back side of the side case. it sucks getting it all back together and realizing that you have a leak. good luck