DT150 serial number question

[BillCon]

Hi friends, I'm new to this forum, and I, have a question I, need some help on hoping somebody has knowlege on, I, have an 18' HydraSport with a Suzuki DT150 I, know its not the original motor so I, cant seem to find out what the year model of the motor is by the serial number plate on the motor, it says "15001 602178" there are no other letters in the sequence on the data plate,and everything I, read says there should be letters in the numbers, am I, missing something? thanks in advance.

[artdf175]

1986
First digit "6"
If you look at top of forum threads there is a link
6xxxxx. Refers to 1986
If you search the internet further there are also other pages that break down by model but the results are the same
Art

[BillCon]

Thanks Art I, kind of suspected it was, this will help me in getting the correct information.