Ported Schwinn DelMar Motorized bicycle 66/80cc

What do you think this Ported Schwinn DelMar Motorized bicycle 66/80cc video?

Ported Schwinn DelMar Motorized bicycle 66/80cc

This is an older non-balanced engine with large porting. It has a great low rpm sound.
Customer came back for some new wheels installed some 12G cranbrook shimano coaster rims.
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