I recently had a new clutch installed on a 750GT I acquired - the previous clutch was slipping from oil saturation (leak has been repaired). I am now getting significant shudder when releasing the clutch to engage first gear - does not happen every time but requires extremely careful engagement at exactly the right rpms to avoid the issue. I am not experiencing any shudder in reverse or any other gears. Can anyone provide input into potential issues that could be causing this?