i have just upgraded my Cen ct4s with all carbon fibre and aluminium. i also changed the 2 speed clutch in it. now whatever i do, i can't get it to change to second. it's just stuck in first. would it be that the 2 speed clutch is stuffed, or that the engine clutch is stuffed??

is it the same kind of two speed as in the mt2?? if not i have no clue..

i'm not sure if it's the MT2 clutch, as i've never seen one before. but its's just not changing, i asked at my LHS and they said take it apart and make the sure that the clutch is free of dirt and that the spring isn't worn, so i'll have to do that. if anyone can assist me, please do.
thanks