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Thread: 78 R100RS swing arm

  1. #1
    Registered User STEVENRANKIN's Avatar
    Join Date
    Dec 2006
    Spencerport, NY

    78 R100RS swing arm

    I remember seeing a few times that if the swing arm on a 78 RS was replaced with a newer one from say an 84 RS, there would be no need to have the 78 swing arm reinforced. If I recall, the two interchanged relativly easily.
    Am I correct?

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    San Antonio, TX
    That would appear to be the case. Matt Parkhouse discussed the changeover in the July 2015 ON. If you don't have a copy, it should be available through the main MOA website.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Registered User lkchris's Avatar
    Join Date
    Mar 2003
    Albuquerque, NM
    They are interchangeable. Whether the older one requires reinforcement is doubtful
    Kent Christensen
    '12 R1200RT, '02 R1100S, '84 R80G/S

  4. #4
    MOA #24991 Pauls1150's Avatar
    Join Date
    Apr 2008
    south of Los Angeles
    On my '73 R75/5, I had Reg Pridmore reinforce the swingarm for me (adding braces underneath) - it DEFINITELY helped to stabilize the back end of the bike.
    A touring-only rider won't ever need it, but a "spirited" rider absolutely will notice the difference.

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