A quick GOOGLE brought this up:http://www.youtube.com/watch?v=eWZfRdm9u9c
I'm sure there's plenty more info avail.
I got some Stihl 4-mix saved in pdf but haven't figured out how to post em.
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"