jo adha tukra andar hee rah gia ha kia wo carb ka pipe ko grip kar raha ha ? i mean is it holding the pipe sealed against the port now ? if yes and your bike starts and doesnt stals then take it to mechainc and they will remove the pipe and they will weld another bolt to it and this way they will remove it.
- dont let the enigne /head be removed. it can absolutley be done without it for 60-80 rs,
-dont allow them to do it with drill machine .. they should use hand macines. ..
after it is removed the threads will be checked for any damage by tightenign with same size bolt if they dont work (which is unlikly i.e. your threads in my opinion should be ok) . then you just need another bolt with it.
total cost of 100rs ..
dont be afraid of opening it again.
just get a feel of it and use proper tools ..
most of motorcycle parts of aluminum which is soft metal.