Just got my z50r out after a couple weeks of sitting and it's just not running right. When I open the low speed jet at all, it starts chugging and when I open the throttle like that it revs up and stays there for maybe 5 seconds before slowly coming down. If I screw the low speed jet all the way shut it runs all right. The carb is cleaned out really well, and I've tried adjusting the main needle but nothing happens. Seems like it's running way too rich but I just don't get it because it was running perfectly less than a month ago. Any suggestions? It's the original keihin carb that I rebuilt with a new cap/ throttle slide and new jets