My vuka xr125 starts only when I put a little fuel into the carb. when it starts it does not stay idling.what could b the problem. when I turn the key all lights are on. I crank it and the engine just turn and turn .there is electrical discharge on the sparkplug and there is fuel coming to the carb but still, it doesn't starts on its own. it's a125cc engine. the carburettor has two pipes coming from the tank. @

Motorcycles - Vuka