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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 23rd February 2021
hwcruisin hwcruisin is offline
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Thank you very much peoples, much appreciated.
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  #12  
Old 23rd February 2021
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Those last 6 numbers are the Serial Number
According to this PDF from MMI,
http://sportsterpedia.com/lib/exe/fe...nkcase_ids.pdf

The first 3 numbers are the Julian Calendar day that the crankcase was made (044)
A number 002 would indicate January 2, where 365 would indicate December 31 of a non "leap-year" year.
The last 3 numbers are the sequential number on the assembly line (088).
The first engine of the day would be 001 where 045 would be the 45th of the day.
The sequential number will generally be below 250.

So if I'm reading this right...
044088 would be built on Julian Calendar day (044) and it was number (088) off the line that day.
Which makes it fall within the realm of possiblity without red flags.
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Last edited by Hippysmack; 25th February 2021 at 02:30..
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