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  1. #1

    Default Mixing xlch sportster cases

    Hey, Iíve got a butchered late 73 xlch left side case. Been heavily repaired. I was hoping to maybe replace the left cases and found one from a 79, anybody got any insight to what date cases are compatible.

    Thanks

  2. #2

    Join Date
    Dec 2018
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    Well, those two are definitely not. Two different iterations of the ironhead case design.

    You need a case from '72 - '76 to mate with your good '73 case half.

    Be prepared to deck and possibly bore the cylinder surfaces, align lap the pinion race and the transmission mainshaft race. This has been done many times, I did a '73 last year in fact. It is not bolt together and go, however.

    Jim

  3. #3
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    Title passes with frame, not cases, so I'd just buy a set of cases for less money and hassle. That set of cases would be attached to the rest of a complete engine because Ironhead donors are cheap. They're easy to find and it beats the shit out of piecing one together for far more money.

  4. #4
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    found this:

    Classic Motorcycle Build

    Ironhead Engine Cases

    As with all motorcycles, engine cases are the foundation upon which all else is built. Starting with a good set of cases is nice, but sometimes we aren't that lucky...

    Although there are over a dozen different factory part numbers from 1957 through 1985, Ironhead engine cases can generally be broken down into early, mid, and late styles (with slight variations in each)...
    Click image for larger version. 

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    Non-Matching Cases
    Mismatched cases usually mean a poor alignment in the shafts that ride in the cases. It can also mean premature transmission problems, because the two transmission cavities aren't lined up perfectly..."
    Click image for larger version. 

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    read more here:
    http://www.classic-motorcycle-build....ine-cases.html
    Click image for larger version. 

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