Welcome!

For starters, there are no 80cc kits, they are all 67.5cc's despite what is hyped, er, advertised...the one's he sells as 70cc's are the plain bearing engines, the ones he sells as 65cc's are a roller bearing engine- both as good as the other.

That seller you are reffering to is very good with service and his prices are right on I've gotten three kits from him and the only (very small) problem I had was rectified right away. (one kit came minus the tensioner and he sent one out double quick)

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If it ain't broke, and you mess with it long enough, it will be.