They started the D tool with the 04 models, mine is a simple flathead. I didn't have my cables off of the bike. I think the surge is from me reattaching them to the carbs improperly. I think the adjuster nuts need to come way down. I'm pretty concerned about the idle knob too. I cranked on it a lot, trying to adjust the idle, then trying to get it back where it was. Adjusting the cable while it is attached is dicey. I'm either doing it wrong or it has to be adjusted off the bike. I did get frustrated yesterday but I still think I'm outgunned without a balancer and good carb experience. I knew the carbs were out of my skill set but I wanted to learn them better.