I'm having an old model TVS Scooty ES, as the petrol was chocking while entering into the carburetor.
After cleaning the carburetor and replacing a new spark plug and I had neither rotated the Air/Fuel Mixture screw nor the Idling screw in the cleaning process. Here the pilot jet is fixed.
Whenever I tried to start the scooty, it idles for a while, but as soon as I open the throttle to move forward, the engine was turning off. By applying the choke for a few seconds & opening the throttle, the engine was running good and after releasing the choke, the engine stops suddenly while accelerating, without accelerating it would continue to remain to stay in the idling mode. So I tried to adjust the Air/Fuel mixture ratio by rotating it clockwise letting more fuel to enter into the carburetor. Partially the problem was solved.
On the road when I begin to accelerate constantly, fuel was chocking So I screwed in the Air/Fuel mixture screw completely in(making no more rotations possible), but no good still I'm facing the same issue. So checked the spark plug color that was turned to brown. So still the fuel consumption was lean.
On inspecting the pipe coming directly from the fuel tank to the petrol filter as I could see the fuel was dripping with a mixture of petrol & air.
So I need to figure out the cause whether the problem lies in whether with the Air/Fuel mixture or from the fuel dripping towards the petrol filter or from the throttling piston?
Engine Displacement 59.90 cc Engine Type Single cylinder, 2- stroke, forced air cooled. Engine Starting Electric/ Kick start Maximum Power 3.5 bhp @ 5500 rpm Maximum Torque 4.5 Nm @ 5000 rpm Top Speed 75 kmph