You mention the off idle stumble. Another reason I think this FI system is a POS. I rode my dads carbed 1700 right after riding my FI bike and was struck by how smooth his bike was off idle. The FI bike is all herky jerky at very low RPM's. Have to use the clutch a lot more. The carbed bikes are so much smoother. Both my old 1600 and his 1700. Car manufactures have this crap all sorted out. What the hell is wrong with the engine calibrator engineers at Yamaha?

Yamaha isn't really known for good FI mapping as far as I can tell. Ever rode an 09+ R1 with factory computer I can't believe any of those ever even sold that thing was so screwed up from the factory. First thing anyone ever does is get the factory computer reflashed. However, those bikes are plenty fixable and can be tuned quite easily.