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Yardsport ys 400


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i have a 2011 hisun ys 400  idles high,once in awhile, runs horrible under load. iv'e put several differant carbs on it , cleaned the gas tank , took off the vaccum fuel pump and put  an 

electric fuel pump.  no change HELP 

this is a carburated engine, but was wondering is there any electrical components that meter the fuel flow,  like  mass air flow senser or something like that could be causing the fuel delivery


ps i have owned this rig since it was new , and haven't had a full  year of flawless riding.


oh and bought it from menards and told me i was stuck with it.

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