I mounted the bars way forward (1.5" forward of stock forward position) on my '06 GasGas EC300. It was by far the best improvement to keep me in the attack position and balanced when standing up. I ride technical woods terrain almost exclusively standing up since my back does not tolerate sit down riding. The bar forward position allows me to put more weight on the bars, taking weight off my back.
I have had no steering or stability issues with my GasGas with this change in over 2 years of riding.
I did this by making some aluminum extension mounts. I made extensions that bolted in the stock bar mount holes in the triple clamps. The extensions had a forward hole in which I installed the bar mounts. The extensions were made of 7076-T6 aluminum bar stock 0.5 inch thick by 1.2 inch width. They are very stout.
See this post for a picture...
http://www.gasgasrider.org/forum/sho...ward#post57616