you can get the installer image off the recovery partition. it's a dmg, though I forget offhand where it's at. Open disk utility to mount the recovery partition and look around on there. (don't just copy the recovery partition, create the installer from the dmg)
Artie's-MacBook-Pro:~ artie$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS HD 100.9 GB disk0s2
3: Apple_HFS HD2 299.8 GB disk0s3
4: Apple_HFS HDx 49.7 GB disk0s4
5: Apple_CoreStorage Incompatible Format 48.4 GB disk0s5
6: Apple_Boot Recovery HD 650.0 MB disk0s6
Artie's-MacBook-Pro:~ artie$
(Emphasis added)
How could a 5GB installer live on a 650MB partition?
Edit: I though it was established long ago that Recovery Partition did
not include the installer...that it merely enabled you to d/l it.