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Welcome! I was literally just looking at one of those yesterday with no engine in it thinking of doing a Lifan/Zongshen engine in it lol.
It's a beautiful bike.
As far as the air filter size, I am assuming you are talking about the inside diameter where it connects to the carburetor? Most of these clone engines use Keihin replicas which have a 43 or 44mm O.D. Only way to know for sure though would be to simply measure it.
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