92 Trailboss 350L 4x4 and I have an issue with that the machine runs great at first, but as I ride it for 10 or so minutes (fast and slow) it starts to smoke more and more(Alot). At first hardly any. After the 10-15 minute mark the machine cuts off. If I wait another 10 minutes it fires back up. I have just taken it to someone who works on carbs and had the carb rebuilt. But I am thinking it's time to dis-connect the oiler and mix gas. How is the right way to disconnect it? Also I have read a few posts that say mix 50-1 and some 40-1. Which is the best?