Jetting
#5
Adding more plates (discs) to the tail will lean it some...the reason for the discs are to "fine tune" your tail to the engines liking. Check your plug to see if its all black and nasty, if so, install the stock 148 main. A simple test would be to remove all the discs and run it to see if it's still over-rich....before changing the main. Not to sound stupid, but make sure the air cleaner is in top shape and not all stuffed up with dirt.
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