Cambelt doesnt seem to fit?

After some advice currently just finishing off a head gasket change on my 2002 clio but the new cambelt doesnt seem to fit. The cars a 2002 1.4 16v with the k4j 710 engine fitted. The issue im having is the belt ive been suppiled matches the reg and engine but doesnt seem to want to go round everything, I know there a tight fit but this doesnt wanna go on at all. Has anybody experienced the same issue before? or any tips? cheers ozzie