I just purchased a used 2003 RS50. The previous owner had instaled a TP 75cc kit, larger carburator, different pipe. When I picked it up, he said that I needed to run between 1-2 ounces of oil per gallon in the gasoline (pre-mix) IN ADDITION to the injection as the injection is insufficient with the 75cc kit. I can't seem to find any information on this. I have read all the paperwork he gave me and I can't find anything about this. Anybody have any experience with this? Thanks for your help.