The issue you described with your Honda Activa could be related to the fuel or carburetor system. When the scooter stops running and doesn't start again unless you pull the choke frequently, it indicates that the engine is not receiving an adequate fuel supply. Here are a few possible causes for this problem:
Clogged fuel filter: A clogged fuel filter restricts the flow of fuel to the carburetor, resulting in fuel starvation and engine stalling. Over time, dirt and debris can accumulate in the filter, impeding the fuel flow. Replacing the fuel filter might resolve the issue.
Dirty carburetor: A dirty or partially clogged carburetor can disrupt the proper fuel-air mixture needed for combustion. If the carburetor is obstructed, it can cause poor fuel flow and lead to engine stalling. Cleaning or overhauling the carburetor, including its jets and passages, might be necessary.
Air leak in the intake system: An air leak in the intake system, such as a cracked or loose intake manifold, can result in an imbalance in the fuel-air mixture. This imbalance can cause the engine to stall after running for some time. Inspecting the intake system for any leaks and addressing them can resolve the issue.
Fuel supply issues: Ensure that there is enough fuel in the tank and that the fuel line is not kinked or blocked. Additionally, check if the fuel valve is fully open to ensure proper fuel flow.
If you're not familiar with troubleshooting and fixing these issues yourself, it is recommended to take your Honda Activa to a qualified mechanic or service center. They will be able to diagnose the specific problem and make the necessary repairs to get your scooter running smoothly again.