How have you made out on your quest to install 38 TM's on your Sport??I am preparing to install a set of TM38 flatslides on my modified cafe 850T.I've found a set of 38TM's set up for a R100 BMW by Sudco.Don't know how close they will be yet,but I've noted that the pilot jet is a 35 with 1.7 air jet.Your condition of stumbling off of idle and frequent stalling sounds as if the low speed mixture could be lean.Let me know what you have found out as I'm just starting this experiment and your experience could prove helpful.Thanks PeteEmail me