Interesting. This was the route (Alderpoint Road) used on a Pashnit tour a couple years ago - it was the Backroads Tour which definitely looks for 'goat' roads. A Hayabusa, a C14, a Multistrada 1100, two 5th Gen VFRs, a Triumph Sprint ST, an ST1300, and a Gold Wing all were being ridden on this road (at various levels of expertise and speed). So your bikes can do this road. Just don't break the 'big bumpy, no brakey' rule and you should be fine. DAMHIK
Yes as heinee sez - it's a cracked up mess of a road - frost heaves 3 feet high (ok I exaggerate) - but it's kinda fun. I'd go back in a heartbeat as I have some unfinished 'bidness' there.