These are the class records for 50cc engines at the Bonneville Salt Flats
I believe the 121.7mph is also the World record...(notice the year !)
The class designations stand for such things as.....
stock motor, modified motor, stock frame, mod frame, streamlining, no streamlining, gasoline, other fuel, turbocharging, no turbo.....etc.
I'm thinking the 31mph one is either a stock Elite ?....or a mis-print.
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50 Cubic Centimeters (Approx. 3 Cubic Inches)
CLASS.......... DRIVER..................Manuf............ YEAR... SPEED
P-P T............. Wagner.................. Aprilia ................