There could be several possible reasons for your motorcycle experiencing this issue. It's difficult to pinpoint the exact cause without more information or a thorough inspection, but here are some common issues that could lead to this kind of behavior:
Fuel system problems: Insufficient fuel flow or a clogged fuel filter can cause the engine to starve for fuel, leading to stalling. The initial stalling could be due to a partial blockage, and after sitting for some time, the fuel flow may improve temporarily, allowing the motorcycle to start again. However, the problem persists once the blockage becomes significant enough to interrupt fuel flow once more.
Ignition system issues: Faulty ignition components, such as a failing ignition coil or spark plug, can cause intermittent loss of spark and result in the engine shutting off. Again, heat buildup during operation could exacerbate the problem, causing the motorcycle to stall after a short distance.
Electrical problems: Loose connections, a faulty battery, or a charging system issue can cause intermittent electrical interruptions, leading to the engine shutting off while riding. Heat-related issues can also impact electrical components, causing them to malfunction after a certain period of operation.
Overheating: Motorcycles rely on proper cooling systems to maintain optimal operating temperature. If there are cooling system problems, such as a malfunctioning thermostat or a coolant leak, the engine can overheat, leading to performance issues and eventual stalling.
Air intake or carburetor issues: If there is a blockage or restriction in the air intake system or carburetor, it can disrupt the air-fuel mixture, causing the engine to stall. Similar to the fuel system issues mentioned earlier, heat buildup can worsen the problem, leading to repeated stalling after a short distance.
It's important to have a qualified mechanic inspect your motorcycle to diagnose the exact cause of the issue. They can perform tests, check relevant components, and use their expertise to identify and resolve the problem.