I 'did' the 'stans on my 1150 in May/June/July, albeit 1 up. Wonderful area to travel although road conditions can get tough as mentioned above. Having said that I got through everything with no major problems and only dumped the bike a couple of times! Tajikistan and parts of kazakhstan/Kyrgystan were the worst.
Do you still have the catalytic converter fitted to your bike? If so, get rid of it - you'll find the bike handles the (sometimes dreaful) fuel quality with no problems.
Go for it!