Monster 620 primary shaft endfloat

Hi rebuilding a monster that I had bought. She hadn't been well cared for at all and I am trying to get her back to full health. I was doing the clutch and found a nice bit of endfloat in the primary gearbox shaft as I can even get a small amount of up down movement on the shaft.
Question is is this normal or is it time to split the engine and pull the box apart.