a friend of mine has a mk3 escort with zetec bottom end running frst management

the problem he is having is he carnt rev past 4k

im thinking it has the wrong flywheel on as it has a zetec one or are the pick up points on the zetec and frst the same?

if not what would stop it reving past 4k, everything has been changed and double checked and i can only see it being flywheel now

but want to make sure before i have to take gearbox off and swap everythig over