I think any SX track is more suited to a smaller bike, period. A 250 2-stroke and 250F would do better in SX with an experienced rider. I think given a couple of weeks on a 2-stroke, that Villopoto, Reed or Stewart would have quicker lap times than on their 450. That's also why I think Cedric Soubeyras did so well on the 2-stroke, is because it is a better bike for SX, regardless of the surfaces.