I have a 2002 Blaster that is stock. I bought it used and it needed a bit of work. I replaced the piston and rings, rebuilt the carburetor with a rebuild kit from the local yamaha dealer and cleaned the filter. It has the original TORS intact and I tested it (following instructions from online and via youtube) and it seems to be functioning correctly. I set the carburetor in Arizona the way the manual indicated and it ran alright there. Now I am in the midwest (IL) and when it runs it runs for a few minutes but it hitches a bit when running (jerky acceleration). It smokes when started and after a few minutes it will die and does not want to start. It takes about 15-20 minutes before it is willing to start again (with the choke) and will run for a bit and die again. After a bit it will foul a plug. I smell gas after it dies, like it is flooded or something. The oil intermixer still works on this bike and is still hooked up. I do not wish to modify the quad (TORS or intermixer) as I want to get rid of the thing, but I need to know why it is doing this. I am not very experienced with two-stroke work. Is this simply a carb adjustment, a TORS adjustment (assuming that big screw head on top of the carb is the TORS adjustment), a jetting problem coming back to the midwest, or some other problem? Any ideas?