KLRCary (RIP) did this for me when I did my 705 upgrade years ago. I got one of the early kits, and Cary allowed for the increased power possibly overcoming the stock clutch springs. He suggested the heavy duty clutch springs and did this mod to compensate for the stiffer pull.
I highly recommend this mod, whether you have stock or heavy duty clutch springs. It just make it work better. Price is very reasonable, too.
2005 DL650 - Sold
2002 KLR 703.5 - Sold
1999 Valkyrie IS - Sold