My scooter is 2008 Sunl Venture scooter with a 157 QMJ engine?

It seem to have it days of starting up with no problem. When I ride it to my job for some reason after I park it in the garge at work. I have a problem with it starting up. Why that I don't know.

I just change the oil and the gear oil on Monday and it was starting up great without any problem. I change the spark plug and it started up without any problem.

This morning started up without a problem. I go out for lunch to ride around. It wouldn't start up.

A menchanic charge me $135 and told me that the charging system is charging up and the battery is very good.

What can be the problem? I don't trust the scotter any more. Someday it starts. Some days it don't.


Please, can some one help me please.