Burning comes from friction, heat, speed.
Your feed rate is too slow and/or bit speed it too high. I'm trusting it's a VS router, so try slowing it way down, and just let the bit eat away at the wood.
Remember, if the wood is burning, so is the bit. Heat dulls the bit much faster than normal use. I have learned you can take a pretty heafty bite out of wood with a slower speed and watching the size of the chips coming from the cut. If it's dust, feed rate is too slow or the bite is too big. If you get alot of vibration, feed rate is too fast. You should see a nice consistant size chip emmiting from the cut, and it should feel like the wood is feeding itself into the bit.
Hope this helps.
John E. Adams<br /><a href=\"http://www.woodys-workshop.com\" target=\"_blank\">www.woodys-workshop.com</a>