How can I find out the year of my sons motor bike?

It is a yamaha pw50 cc baught it for christmas but dont know the year or:It is a yamaha pw50 cc baught it for christmas but dont know the yearor:Check

It is a yamaha pw50 cc baught it for christmas but dont know the year

or:It is a yamaha pw50 cc baught it for christmas but dont know the year

or:Check for a serial number on the under part of the Bike & email the company it was manufactured by & they should tell you what year it was built in. Mike

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