Bajaj Auto Limited — Pulsar rs 200 problem

Address:

Nashik, Maharashtra, 422013

I have purchased a pulsar RS 200 NON ABS Bike in july.but i have facing a critical issue about exhaust.my bike exhaust outputing a black fog. When my bike engine starts, on exhaust cover there is black carbon. I already showed to authorised service center of bajaj. I urgently need a action.