My cars driving side wheel got stuck after driving 2 to 3 kms, so I opened it and lubricate calliper pins with some oil. On that occation it works but after 3 or 4 days its happens again. What can be the issue? Is the calliper piston is a real culprit, Can I serviced that too?
Another issue is with the carburetor. Few days ago I gave it to carburetor guy, he serviced it and install new plunger piston. Now when I start my car after 6 or 12 hours it requires choke. Carburetor guy said due to long use on CNG the metal ball inside somewhere in accelerator pump is stuck and you need to replace the whole carburetor 
He also told me to put some oil with petrol, according to him the metal ball maybe free after some running, and there is no other option.
Is there any way to repair it?