Lion/snow leopard dual boot remove lion

Hi there guys,
I have recently (december 2011) purchased an early 2011 macbook pro (Inte Dual Core I5 2.3Ghz, 8Gb Ram, 500Gb hard disk, Graphics Intel Hd Graphics 3000 512Mb memory)
The system came initially with Snow Leopard installed which I substituted with Lion doing a fresh install (deleted hard disk) several times as I was not at all pleased with the installation as it seemed to slow the whole booting process considerably and caused several strange graphic issue such as strange lines when switching from one mission control window to another plus mail giving me a spinning ball for approx 30 seconds before actually starting properly and sometimes crashing, not being able to work with the desktop after booting for at least another 30/40 seconds.
I therefore decided to partition the internal hard drive creating an 80 gb partition in which i installed in a a dual boot manner Snow Leopard.
Now I am very pleased with the fresh Snow leopard install and its performance and i would like to get rid of the primary partition with lion installed.
Can I just delete the partition via the disk utility without incurring into any problems or.....
Any advice would be very much appreciated.
Happy winter to all...
Mirco

First, BACKUP!
Remove by:
Open Disk Utility.
Erase the Lion partition to MS-DOS (FAT).
Remove the extra partition by opening Boot Camp Assistant, then restore your drive to a single volume.

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