If it sits a few days it is almost impossible to start.But once you get it started it starts up just fine the rest of the day.

It only has kickstart, no electric start.What can l do?

At the end of a ride shut the Fuel off and let bike run out.This makes start-up easier and you can even use the choke.

Your carb has an enrichener instead of a choke. Start it with the enrichener full on and the throttle closed. If you open the throttle even a little bit the fuel mixture will be too lean to start when cold. If the enrichener is not working then remove the carb bowl. There is a little brass tube hanging down from the carb. Look at the hole that it goes in in the carb bowl see the tiny hole that it gets is fuel from the bowl. clean it out.