Thanks for the water cooler, realy enjoying Chilled water from it(H)(H):D:D
reading your post, I think you must take a look at your scooters body from inside where the engine is placed, I think its badly rusted if its doing this after that repair,
If you have difficulty opening its carburetor compartment, You must consider my point as well, As you are in Islamabad, so can't help it out sitting here without any pactical examination