I have some prolems with the throttle and the choke on my Sk-486 (which you can see ). My dad and I redid the seal on the carburetor last fall and tried to readjust it so it would start after being messed with. I have a link for the manuel in the quote. The carb seems very picky and very tempermental. I have to run with the choke up and if I put it down it dies. I also can't put the throttle down very low or up very high either or it will die.
Here is some more info from my first topic about my Sk.