i own a 1987 zx750r that sat for ten years. it has 14000 miles and drives nice, but going into my second year now i have run into problems with the clutch. the clutch plates and friction plates were replaced and now a year later i find it slipping. With the clutch (hydraulic) pulled all the way in and the brake all the way in i find the bike pulling forward until it stalls. Cleearly seen on its centerstand   --    when initially started the tire will start spinning although only slightly. Clutch adjustment or something worse?