Find the InstallESD.dmg
- either from App Store (Start installing Maverics (even if you are already on Maverics) and the location to the file is:
/Applications/Install OS X Mavericks.app/Contents/SharedSupport/InstallESD.dmg
- you can also extract it from the Recovery Partition
Note: do not use the iso version and don't try to convert it. You will fail.
Then download http://liondiskmaker.com/ and follow the instructions.