I normally use Swedish Gunnar Gassers on all of my bikes and have never had a problem with them. I recently tried one of the Taiwanese copies , as I had a quick look and couldn't see any noticeable differences. But the first time I used the imitation throttle, it let me down by jamming in the off position and the bike stalled. I had landed off a jump and the part of the throttle tube that holds the cable nipple, pushed past the stopper (which is built into the top cover) and jammed. It took a bit of effort to get it free again. It was a good painless lesson and I will never use one of the Taiwanese throttles again.
I probably put the Gunnar Gasser on Tony's YZ465H, as I had that bike an owner or two before him . I would have used a Husky cable, as they came out with a Mikuni carb and Gunnar Gasser as O.E.M. I know that Les at VMX Unlimited sells the Swedish throttles for only a few bucks more than the imitations and he also sells an aftermarket cable which suits the Gunnar Gasser to Mikuni or Bing carb (and I think that this cable is a bit longer than the standard Husky one ).