I have a 2007 Pulsar 180 UG3.

The bike has done more than 50000 kms and these are the major repairs carried out.
at 40,000 kms New cylinder Kit , valves , piston.
at 45,000 new clutch

I have a Knn filter too and it has been cleaned and oiled recently.
I am running this setup since the past 7 years without any problems.

in 2013 the bike was completely standing for 7-8 months.

After that i got it serviced, replaced the battery etc.
Also got the carburetor cleaned atleast 10 times from different mechanics.

The problems

When i accelerate the bike NEVER goes beyond 7000 rpms and after 6000 rpm it chokes badly. (It hits 100 in 5th gear max )
Sometimes with speeds less than 15kmph the bike just stalls.
Once i got it serviced and carburetor cleaned it was running perfect, hit 10000 rpm but while slowing down it stalled again.
After that within 5 minutes the problem came back.
Presently if I open the throttle fully, it just chokes badly and refuses to go beyond 5000 rpm, below that it is smooth.
If i open the accelerator smoothly, it eventually hits 8000 rpm after a long time but then it just chokes very badly.

The mechanic says (he is an ex-HH mechanic) That the engine and clutch are in perfect condition.

I dont know what to do and my Leh-Ladhak ride is coming up within 20 days so i need a solution fast !

There is also a small crack because of rusting at the end of the exhaust pipe.
There was a small crack in the Air intake pipe but i fixed it with some Mseal and it did not make any difference.

Please help !