I've watch quite a few enduro 2-strokes (ktm, kdx, so on) drive and all seem to let off an excessive amount of smoke. Is this normal, running rich, need to repack or clean out s/a?f
It depends on what your definition of 'excessive smoke' is. 2 strokes will smoke a little just because of the oil, but way too much, like a haze that will stay there if you rev your bike while sitting still is probably just it is jetted too rich. That's what mine is doing now. If you need help on getting your bike jetting right, go to the tech tips section @ justkdx.dirtrider.net and click on carburetor tuning. It is very helpful.
I think that condition is common for most spare time riders who don't want to change their jetting every time the conditions change. If you watch a pro race though you'll never see smoke from their bikes unless they just started it up.
once my kx100 is warmed up, it doesn't smoke at all. when you blip the throttle, nothing. my dads kdx is normaly on when he gases it. i thought it was rich too, but thought it could just be how they're set up.