I have a 2006 CRF80F that I just bought used. The person who sold it to me said that this bike had always had problems with the carb and required a 10 minute warm up. That didn´t sound right to me. Anyone else out there ever experience carb problems with the ´06 model? Should I spend money on fixing the stock carb or upgrade it to get more performance out of the bike? Any suggestions or experiences would be greatly appreciated.