I did put on a g2 throttle cam (400 SIZE) to soften the first 25% of the throttle opening as it was jerky at very low RPM. While this was really a fueling issue, the throttle cam softens the problem acceptably.
I added a Steahly flywheel weight to my two stroke KTM 300XC to mellow and add traction. As another person stated this is simple and cheap on a 2T. Not as common as it once was though.
'12 DL650 Adventure; '08 KTM 990 Adv w/19" front Excel; '09 Sherco ST 2.9 trials; '03 KLX400SR