Help please!!!Why my motorcycle cuts off when i mash the throttle to speed it up

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Hello

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on first gear? it was working fine last week, but it started doing this since yesterday. now, i can't get it to speed up because if I try to speed up, it wants to cut off. why? what is wrong with it? I NOTICED THAT THIS HAPPEND RIGHT AFTER I FILL UP WITH GAS SINCE I JUST BOUGHT IT.I dont know why, i used the premium gas.

It's a Lifan. Model number: LF200
if you type this address on google you will see an exact image.

Vehicle Reviews for 2006 American Lifan LF200

please help me! i don't anything about motorcycles!! thanx in advanced!
1 day ago
here is the link of my bike:
http://www.powersportsnetwork.com/enthus...

I have problems cranking it up, but after a few tries, it comes on fine with the chock of courc.however, i cannot bring the speed up in neutral nor on first gear because if i do it, it cuts off. even if I try to do it slowly, at some point, it cuts off.
 
OK, did you try the choke suggestion (1/2 way open) to prove out what I said.
Listen, You filled it up with gas and almost right away it started having this problem. (did you use a gas can...) It really seems to me that there was a bit of rust or some other crap in the gas which is partially blocking a jet, thats why it runs at idle but nothing above..
American Lifan is the fully owned subsidiary of China Lifan. Since we have answered this post several times and you haven't checked the jets or other things It leads me to believe that you do not have any mechanical ability. What you need to do is bring it into some where for service or find a friend who isnt afraid to pull it apart and work with people on here to help you.
 
the link does not work

Anyway you have a gas feed problem. And thats about all i can say for sure.
 
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