Hi Bruce!
We did it without issues. Not the most fun section of our trip as we had to ride all day long. We even managed to cross the tricky section without using additional fuel containers. I had 3 liters in containers. Between refuels I had 403 kilometers and topped up exactly 12 liters. Honda NC700 took 3 liters for 100 km (cca 78 mpg). I had tempo of 90-100 km/h.
There are two new petrol stations that are still being constructed (one looks like complete but still no fuel) so it will be 300 km and when the second station becomes functional, less than 200 km between petrol stations. So this section will not be an issue anymore.
We stayed in Uralsk, Aktobe, Aralsk, Turkestan and Talas. Many places to have coffee (in fact, tea brakes along the way. The road is pretty straight, good and boring. On our way back we will try to change places so we will try to find accommodation in Shymkent, somewhere between Kyzylorda and Baikonur, then Karabutak and leave Kazakhstan after Aktobe (direction Orenburg).
The open street maps that I have on my Garmin worked perfectly except the border crossing Taraz-Talas. It took me to some old border crossing that is not in function anymore. We had to go back to Taraz and find a new route. Not a single sign to direct you to Kyrgyzstan or Talas so we had to ask local people few times. Besides that, all worked perfectly. Thanks HU for Asia waypoints. Very accuarate.
Where are you at the moment?