It looks quite small, likely Chinese, so I'm guessing it would have had a T8F (metric) chain originally but the clutch and sprocket could have been replaced with something different at some time. You can get a T8F chain for $10-15 on Amazon.
I'm wondering if it's had an engine swap. Most bikes with 4" wheels have a 40-50cc 2-stroke with an attached gear reduction, that or an electric motor.
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