Buying a "new" second hand kit

I was just scrolling gumtree and came across a cheap new in box motorised kit the guy said he is unsure if it's a 80 or a 50, I'm going for a look and I wouldn't know how to tell let alone if all the parts are there and what makes a good kit from a bad one? I'd imagine I wouldn't want a flat roller style tensioner and want a good set of mounts ect.... It's half the price of any kits online here so if it is zbox as he said it's a steal

Any help much appreciated
 
Welcome to the forum, look at the nuts holding the head on, the 48cc engine has 6mm studs. All 66/69cc engines made in the last 10 years have 8mm studs, the gasket template can help you identify it as well.
 
Welcome to the forum, look at the nuts holding the head on, the 48cc engine has 6mm studs. All 66/69cc engines made in the last 10 years have 8mm studs, the gasket template can help you identify it as well.
It's a 66 and the guy took 90 bucks what now? I've got a really good bike but the sprocket is broken can I just put the kit on and use it as is ? Whole new bike? Recommended tools? Just any tips on getting the sprocket on ect ?
 
What do you mean when you said the sprocket is broken, I'm with Curt, post a few pictures of what you have and someone will advise.
 
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