Good...I hoped it was single carb.
So...when I asked the seller to elaborate on any problems...here was the response: "I put new Kevlar clutch plates in it a couple hundred miles ago. First issue. When I put it back together, there is a spring around the kick-starter, well while you have the side-plate off, your suppose to put the kickstart lever on and cock it a half-a-turn and push in the spring into a slot. I didn't do that. So, that needs to be done. But, it works, just every now and then, you have to cycle thru the motion. Easy fix the next time you take the side-plate off to clean the oil screen. Second Issue, between the carb and the head there is a air-gas mixture screw. Well there is a plug where that screw is suppose to be, so there isn't adjustment for higher altitude. About a 20 dollar screw. But other than that the bike is very strong, and very reliable. If your bike was that reliable, I'd ride it up there and drive yours back. I'd say the only draw back to the Honda XL500R is, kick-starting it after it has been left sitting. Ride it every day and starts very easy, let it sit and you will kick on it for about 5-10 min, but then it will fire up."
None of this worries me too much...but I thought I'd submit here for your perusal. Actually, I take that back...I'm not too sure about the "air gas screw" story.
I've never heard of a carburetor working well with a plug where a mixture screw should be. But maybe this carburetor really is different than any I've seen before.
Thanks!
Clem