Giday I have this issue. I rode the bike to Melbourne on Saturday and back home on Sunday 600km round trip went well. Two days later I went to go out and as I left the driveway the bike ran like a bag of shit (I let it warm up for about 2 mins before riding), power surging, and slight popping on de-throttle. Tried it again today and it did exactly the same thing. After I embarrassingly headed back home from around the block and into the garage I let it idle for a bit. Chugga, chagga almost stalling, I tilted the bike to the right and the revs came up to normal, straightened it up again and the revs dropped again, I tilted it to the left and the revs came up again....mmmmmm. The fuel gauge was just Ove half way. I added more fuel to full. I started it up and the revs were kinda normal, I did the left and right test...all o.k so far. I took the bike out again and it went ok reving it up through the gears. When I hit the 100km zone and settled in on that it felt as though it was hesitating. I backed down through the gears and noticed no significant popping. On the side of the road I let the bike settle from about 1 minute and then took off again. It was ok reving up through the gears but as soon as I wanted to settle on the sweet zones of 4th gear @ 80kms and 5th gear @ 95kms it we like it was running out of fuel. Wow that was epic I know but the more specific I can be the better. I use Shell V-Power its a 98 octane premium unleaded fuel. And I have just put a new battery in it. Cheers and thanks in advance.
My 2007 FXDWG did something similar to that, turned out to be a faulty crank position sensor.