Hi Ck2,
Machang, I have been through the same procedure 4 years back. Let me tell the story machang, I had a CK2 2000 model. Due to its previous owners crazy driving the carb had the same story as of yours. Mind you my mechanic told me the same thing.
Eventually bought a brand new carb the last of the lost UM had for 97000.
Before buying it from UM did some shopping in panchika watta. They have carbs from 15-25 ....
My mechanic did not like the idea of putting a recon one.
call this number Kapila - 0777193397 he is my mechanic hell be able to help you out with the carb matter.