A few thing to consider :
                 1: The clutch can feel heavy if the cable has worn ( over time )through the nylon inner casing .
                 2: If the clutch is VERY heavy it can break the quadrant in the end of the gear box ( behind the green circular plate on the end... quite easy to replace )
                 3; In extreme circumstances the center release shaft/rod ( which slides inside the input shaft ) can punch a hole through the center release plate in the clutch assembly ( I have seen a few that have done this ) . This makes it a right bu66er to get the box out as the release rod tends to get stuck and you can end up bending the rod and knackering the small oil seal and bronze bush in the end of the inputshaft.
 N.B. I would always recomend replacing the oil seal and bush when replacing the clutch assembly ( a small price to pay compared with replacing ( an oil contaminated ) plate a few days later !!! ÂÂÂ
