Yep it is a K1100RS fairing.
When I say run out of steam it is not that it stops accelerating, just that it does so slower and being that Costa Rica is a small, mountainous country with rubbish roads I run out of room to keep pushing. The main place I have been able to get up to 110 mph is a straight of only a couple of miles, I think I would need to be able to stay in the throttle for at least a couple more miles to hit the 140 mark.
I do also think that at 125,000 plus miles, most of which were with little or no maintenance, the engine is a kinda tired.