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xr50 cuts out and backfires

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I just bought a xr50 with 88 kit, race head, cam, and big carb. Got a good deal on it because it is not running right. It starts up just fine but when you give it throttle it will pop and sputter and will not gain rpms. I thought it might have been just a dirty carb so took it apart and cleaned it. It was pretty dirty. Still runs like crap. I'm thinking coil or spark plug? Any ideas?

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