If it has suddenly gotten rich, it's probably not a jetting problem. Chances are you've got a leaky needle valve/seat assembly, or a float that has gotten some gas in it and can't seal the incoming gas well enough to keep the fuel level in the float chamber correct. A high fuel level will result in a rich-running condition. You could also have a sticky power valve that's letting fuel bypass the main jets. Either, or both conditions will make the engine run very rich and use lots of gas!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!