[mechman600]

Very cool find.
SRX400s were sold up here. I have never heard of a 250. I had an XT350 enduro bike with the same basic engine and keihin carb setup. It always ran great at partial throttle, but the transition to the second "barrel" was always jerky. Att WOT it was fine. Then when you let off a bit it would pop and bang for a second. I messed around with it for a long time - adjusting the float height, needle position, soaking in carb cleaner and all sort of other things (that I forget right now...it's been a while). I was told on Thumpertalk.com that this was a normal trait for the "emission choked" XTs. The dual carb thing was kind of a neat idea, almost like a poor man's V-TECH, but I think the later CV carbs like on my DRZ are much better. Definitely easier to tune and way more responsive, anyway.