I had a similar problem on my 125cc Apollo ATV. You will need 5mm sized fuel line, and go to autozone or orileys to get a new filter. Take the carb apart, and blow everything out with carb cleaner. What I do after EVERY time I finish running the bike for the day is while the engine is running I drain the fuel bowl.
Hope this helps
Douglass
Here is the link for the fuel line I replaced the factory lines with.
https://www.ebay.com/itm/Motion-Pro-...72.m2749.l2649