I have a 2003 625 sxc with the bst40-266 mikuni carb in it. It ran, and then sat in the garage for a couple years. Now it will turn over but won't start. Battery has been charged. New spark plug. It will start and run for a few seconds with starter fluid, which leaves me to think that it is the carb. I have meticulously cleaned it, with no result. I am starting to think that there is too much wear on some of the parts (slide, slide guide, float needle), but if that were the case then it wouldn't have ran before it sat, right?.