In the interest of science, and the fact that the weeds aren't that tall, and I really didn't feel like getting on the Nordic Trac, I got the 919 out of the basement, checked the tires and went for a little ride to see about this low end fueling issue.
I rode at 2000 rpm in 1st, 2nd, well I guess all the gears. Held a steady throttle. No surging, no stumbles, just burbles right along, happy as a lark. Throttle inputs are completely linear. A little throttle equals a little go. I rode in first gear while standing; up and down hills. Surly then, the problems would surface, nope. It does just what it is supposed to do.
Now I know that all goes against convential WT dogma. I run the maligned 2Bro single can, a K+N, no PowerCommander, hell I even took the hole saw to the side of the snorkel. By all accounts, my 919 ought to be a cantankerous POC, but it's not. It's very smooth and easy to ride. I guess my bike just doesn't know any better.
Now I'm going to get myself into trouble. I wonder if the guys that are having problems with low end fueling know how th operate a throttle. This thing has respectable torque. It's FI-ed and very responsive.
If you want to see real low end fueling problems, ride a small bore 2 stroke KTM dirtbike.