Roketa Jonway Linhai Crank Seal

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That Machoman (Roketa Jonway) with the Linhai 260cc engine that I talked of in the Diamo Velux thread, I purchased it this morning for $200

Usual look over for a non running scooter, revealed the normal problems, as well as a bad rear axle and wheel assembly. Looks like the previous owner did very little maintenance, since the crank oil seal is leaking. Discovered that when I went to pull the CVT cover.

Does anyone know what the seal size is so that I can order it for quick shipment, before taking it apart. This is my first Linhai engine, so there will be a learning curve.