Vintage Briggs and Stratton 2.5HP "Easy Spin" engine!

#1
One of the mini bikes I bought a few days ago has this old Briggs and Stratton 2.5HP "Easy Spin" engine. I cleaned the external parts a bit and found a serial/model number on the side. It says: 80102 0168 01 6802191. Can someone help me track this down to the year this motor was made and what it was used on please? I also believe I'm missing a part on top of the carburetor since they are put inside the engine.
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