ZX2R not running please help!

Hello everyone,
Im looking at buying a 1991 ZX2R but it has a problem, It runs normal, starts fine, revs fine but when it gets to running temp is stalls and wont start again until its cold again...
If anyone has some similar experiences or have any idea what it could be please let me know?
Thanks very much
Im looking at buying a 1991 ZX2R but it has a problem, It runs normal, starts fine, revs fine but when it gets to running temp is stalls and wont start again until its cold again...
If anyone has some similar experiences or have any idea what it could be please let me know?
Thanks very much