Ronald,
The bet is that your rings will be worn and need replacing and if you do that you may as well replace the bearings and 'O' rings. Cost to do this would be around $80.00 max in parts.
But before doing that can you check one thing and that is the air filter because you said that it is running rich. Make sure that you have not put it in upside down or the pre cleaner is not covering the inlet hole.
Without more detailed information it is hard to give you correct information.
Did you get information from the parts list and manuals area on how to service the carby?
