1978 yellow Honda Express problem?

Hi,
I recently bought my 1978 Honda express and when I bought it it was working just fine but began to have problems. When I start my Honda on its kickstand the back tire will begin to start spinning fast as hell and I have to hold the back break to stop the tire but as soon as i let go it will start up again. But that's not the real problem. When I try to accelerate the throttle it begins to make a low noise and ends up dying off.
Please Help ME.

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