BladeZ 40cc go-ped doesn't strart... well kinda

Question

Today i got a BladeZ 40cc goped for $70 and actually it looks pretty new! Great price right? Well anyway, when i got it home it took me about 5 hours to get it started (the guy that sold it to me said it hasn't run in a couple of years). When i got on it, the ped was REALLY sluggish. In fact it didn't even reach past 5mph. It also died within 60 seconds from when i started the thing. I havn't been able to get it started since. I checked the spark plug and seemed to be working fine. Have any ideas what's going on?