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My dirt bike wont stay running and everything is clean.? - clean up a dirt bike engine

Hello everyone, I give thanks you in advance for any help you, the very much appreciated.

A week ago I bought an old yz100 Dirt bike for only $ 100!. It does not run hard, something like that. all the arts in transition, but uses the engine to run long enough or the first of the aisle. I was about 50 meters to a maximum time. I am, as I drove forward, but you can not simply choose to run. It works very well for a few seconds, then it sounds as if there were no gas in it the sound compression and the piston. sorta it slowly and then the gas and a small pony. again and again. but not consistenly. I have a "ceiling" for this new spark. and run very well if I drip spray from liquid or gas, which reminds me of a carburetor problem of the valve. It is a 2-valve 100cc. If someone could tell me, what with him and work, so I give you as many points as possible. than one million. Thanks