I'd also say its very dependent on the weather, and if you take the time to fine tune everything when the weather changes it will be consistant. My bike will ide well up to about 70 deg. F, when its warmer and more humid it stalls(at idle) eaiser. No big deal as response is very good and it pulls hard.
FWIW, I've played with the Mikuni on a Husky WR250. What I've noticed is that the air screw on a Mikuni seems to have more effect than on the Keihin. The bike stalls just as easy when its hot and humid in mid summer however.
The down side is that they are less flexible to tune. Les also told me that the Husky 250s run better with a Keihin conversion.
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