Yeah, I should have explained a tad bit further there on the carburetor. Two of my friends have three of them between them. Both of them have one on cr500's they put snow tracks on. They stay on the throttle for pretty long periods compared to how a woods rider or mx rider would. You find a place you have to shutoff quickly, and the slide hangs up. Usually it just amounts to being a very noticeable slow return. One experienced it with a billet version of the carb and was told they cured that with the cast version, so he bought one for another bike. It does it similar to the billet version. It could be icing, but the keihins don't do it on the same fuel. I still have some Lectrons which have the similar square and thin slide. They did it (stuck) on the large KTM's I had them on, but oddly not on the xr500's. BIG air flow and you have the slide getting pressed against the body of the carb hard and a flat, square slide may need more spring (which is what we did to the lectrons) than what they are sent with.
Along with a big cash outlay, both of these guys really want the carbs to work, they got VERY noticeable gains in fuel consumption. Makes a big difference in how long you can ride.
Someone else did the "unicorn explanation", and the comment was meant for anyone who does research using ebay and amazon.
I know I should delete this post before to many people read it. What can I say I am only a country boy. I never heard that statement before.
I know Ossagp or anyone was not picking. MY question about the "unicorn cow" is what I was talking about. I never heard that before so I wanted to know what it meant. I could imagine everyone rolling their eyes when I asked what it meant. I was thinking that "unicorn cow" meant something. No hard feelings was taken or given. Everything is cool. 
