Balance Shaft Removal??!?!?!

I just dont know what really the balance shaft is and why should it be removed? and was are pros and cons thankyou

and where can i find some information about it

http://members.shaw.ca/costall/1000Q/800/index.htm its under "specific major procedures, changes or upgrades"

Lots of info on the vfaqs as usual. www.vfaq.com