I have an '88 XR600R with CR500 forks, a supertrap/jets, baja street kit, and I love it!. The only issue is, it seems to have a worn out carb in that, as vacume builds, it gets sticky - like the slide has slop in it. Has anybody seen this before, could it be some venting issue ? If the carb is shot, I guess I am looking for a good used one, or any suggested upgrades etc. On a different note, can anyone tell me how much better a KTM 450 would be than a XR400 for over all fun, low maintenance, and of course ride comparison.