2 stroke help?

i have a gas scooter that was given to me ( disassembled )
got it all together and (ruining for a min ) pretty sure that the carb is screwed cause it will start and run for about a minute iif i play with the throttle but eventually dies it doesn't have a needle valve on the side just one that is part of the throttle & and the factory settings don't help but anyways my main question is that i think its a 49 cc but not sure will it hurt it if i bought a 49 cc carb even though it may be smaller any suggestions on fixing my current carb would also be greatly appreciated thanx

i dont know what kind of engine it is hears a picture i doubt itll help

http://i92.photobucket.com/albums/l27/re...
http://i92.photobucket.com/albums/l27/re...
http://i92.photobucket.com/albums/l27/re...

Always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.
Are the reeds installed properly and in working condition.
Does it have an automatic choke? It could be defective.
How disassembled was it? Did you check the compression after re-building?
More information is needed.

Are you sure it is a 2-stroke? most scooters on the road are 4-strokers. I have had the same problem with several things and it usually turns out to be the idle sensor or pulley or something simple like that. make sure everything in the inside of the engine is clean, like jets, carb, valves, plug, everything. that can really put a damper in your ride ability.

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