Note that you have 2007 pre-gen model while Chinmay has 2008 new-gen model with completely different airbox. You just have to remove seat and squirt some petrol down 2 air-cap ports that are just behind and under tank. Put some rags underneath airbox bedorehand as some petrol will leak out through seam.
Wait 30-sec, start engine and rev it. You'll have same result. Engine will rev great with instant throttle response until extra petrol runs out. Basically shows you've got fuel-flow problem with engine not getting enough petrol from carbs.