Can registered will be partly enforced by registrar ??

At the time of the death of the Testator, the properties which lie in his name shall be divided among the two as mentioned in the will .

yes they can share the property as per the WILL 

The will comes into force after the death of 'Z" and whatever properties were left/remaining after his death by Mr.Z has to be distributed as per the will.

" Z " bequeathed three properties to" X "and "Y "through his will out of these three properties he sold one property during his lifetime after death of "Z ", "X "and "Y" have right to get transferred remaining two properties in their name as per will.

Although Z bequeathed three properties to X and Y, he during his life time sold one property. When he died two properties mentioned in the Will are available. The beneficiaries can share the properties as per the Will.

I endorse the advise of experts.

X & Y shall take benefit of the 2 properties left over and bequeathed by Z .

Yes, the properties,left would be shared. But it is not the Registrar's jurisdiction to enforce the bequest. The legatees need to get the Will, if so required, and get the property mutated in the public records.

As per the Will the properties whichever is still available, the beneficiaries n acquire them and divide them equally between them subsequently by  a partition deed.