Every one above is wrong. Check the condition of your shock. The factories save a lot of money and put on rather average rear shocks on many bikes. Some are ok, others are s***e. Spend some time on the shock and it will transform the traction. Try more rebound damping. Generally a well valved & slower rebound rear shock will get better traction than a soft fast shock.
Check you shock, shock, shock, shock!!!!!!!!
..................... well, ok there is something in the above. But not as much as in the rear shock.