Installing FCR carb, have all the jetting, seems that all I need is a EMM jet needle which I can get from Sudco for $8.14 + shipping. Is there any reason I should buy the $64.80 + shipping JD jet kit? Are there parts in the kit other than the jets and needle that I will need or will improve performance? After doing a search it seems that the needle is the reason to buy the kit. Any feedback will be appreciated.