I have a Hero Honda CD-Dawn(100cc) sometimes engine stops suddenly when i ride?

I have a Hero Honda CD-Dawn(100cc) Motorcycle and from few days, when i ride the engine stops, even when i throttle it to get the acceleration back it won't, it stops and hard to start on again. Have to kick more than 5 times sometimes! What's the issues and how do i fix it? Carburetor is clean and there's a fuel filter between the tank and the carb. And fuel goes clean!

is it the spark plug or CDI Unit?

Some electrical problem, may be;

Or, lack of sufficient running, on daily basis;