My XX does a really silly thing. I discovered accidentally with my fat thumb trying to cancel the turn signal, I hit the horn button instead. I thought I felt the engine cut out for a split second. I tried it over and over and it seems very intermittent, but about once in 5 or 10 little beeps of the horn, the engine hesitates, just barely detectably. This would be at 70 or 80 mph (on a closed course by professional riders, don't try this at home) with even throttle, not accelerating or decelerating.
It's a '99 (fuel injected)
duh,
beltwaybob