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I'm trying to research my late grandfathers 1951 pan head. VIN #51FL5321. I'm not sure where to start, I have looked on other sites and seem to know that it was a 74 cubic inch motor, sport solo. Just by the pictures I have. I also have the original bill of sale. Im looking for ANY info you guys can give me, or even point me in the right direction. Thanks!
New Info: It looks as though it may have been sold in Florida.
Engine number is the VIN (Vehicle Identification Number) and is located on left case.
Not frame number.
First two numbers are the year. 48EL5719
Letters are the model. 48EL5719
G , GE - Servi-Car Side valve 45 cubic inch three wheeler, 1932 to 1972
E , EL- Overhead valve 61 cubic inch
F , FL- Overhead valve 74 cubic inch
K - Side valve 45 and 55 cubic inch
U , UL- Side valve 74 or 80 cubic inch
V , VL- Side valve 74 cubic inch made prior to 1936
W , WL,- Side valve 45 cubic inch made 1934 to 1952
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