You can do this by following these instructions: Create a Bootable Version of the OS X Mavericks Installer on a USB Flash Drive

The second step we need to perform to prepare for the clean install is to create a bootable version of the OS X Mavericks installer.Back Up Your Startup Disk Using Disk Utility (clone) And second, you can use the Time Machine backup or clone as the source for migrating your user data back to your startup drive after OS X Mavericks is installed. My recommendation is based on two things, First, I'm paranoid about backups, and prefer to have multiple copies for safety. I recommend performing a Time Machine backup and creating a clone of your startup drive. Since the clean install process will erase all of the data on your startup drive, we must have a current backup before we can begin.We're going to start the process by taking care of two preliminary tasks that must be performed.A startup drive that contains OS X Snow Leopard or later, and that you're willing to erase.This can be a Time Machine backup or a clone of your startup drive. A backup of your current startup drive.A Mac that meets the minimum requirements for OS X Mavericks.The OS X Mavericks Installer, available from the Mac App Store.What You Need for a Clean Install of OS X Mavericks This works fine for the upgrade install and the non-startup drive install, but it doesn't allow you to erase your startup drive, a necessary process if you want to perform a clean install. Instead, you run the installation app directly on your Mac under the older version of OS X. Unlike the older versions of OS X that were distributed on optical media, the downloaded versions of OS X don't provide a bootable installer. However, when it comes to performing a clean install of Mavericks on a startup drive, the process is a bit more difficult.

The OS X Installer can perform both an upgrade install (the default) and a clean install on a non-startup drive. Screen shot courtesy of Coyote Moon, Inc.

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