I have a 13' and was having problems with hot starting. Took it into the dealer here in Reno NV. They had just received the FI diagnostic tuner (still in the shipping box) and were unfamiliar with its use. Got a call today and was told that the CO was set at less than 1% and it ended up set about 3.5% after figuring out some comm. Issues. He tuned it just like using a mixture screw adjusting it till it ran too rich and then backing it off. Can't wait to see what difference that makes.