Drive shaft damper

Discussion in 'Airheads' started by Hook74, Sep 12, 2021.

  1. Hook74

    Hook74 Been here awhile

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    Hello
    I have heard of 100mm extended drive shafts used with or without damper (see pic).

    Having to buy a drive shaft, I have a doubt.
    Damper yes or no?

    do you have any advice?
    Thank you


    03CB3A21-2B23-4FF4-8972-9A2399D87618.jpeg
    #1
  2. bleaknessengine

    bleaknessengine Been here awhile Supporter

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    i have an extended mono, the shaft is a tapered fit extended bell housing. so no damper. i’ve been riding it about a year and a half, and it is a little more jarring to shift, but that can be mitigated with technique. i also don’t try to go crashing through the gears and i ride pretty gently in general, so maybe i don’t have a typical experience either haha.

    27A80DD4-C861-423F-9F8D-3521222CDB33.jpeg
    #2
    hunterkey and Jim K in PA like this.
  3. OldCrustyStuff

    OldCrustyStuff Adventurer

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    I upgraded my 78 R100RS to the Cush drive driveshaft like that and it’s noticeably smoother IMHO
    #3
  4. Beemerguru

    Beemerguru Beemerguru...G/S guy

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    I've built 6 customs with extended swing arm...both dual shock and mono. Cush drive in all with no problems
    #4
  5. Hook74

    Hook74 Been here awhile

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    ...hello...thank U
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  6. Arktasian

    Arktasian Feelin the BMEP

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    Not sure where you hail from ^ , but I'd recommend having Greg (aka Beemer Guru) build & insert the cush drive if your shaft isn't already modified. Much more forgiving towards any driveline shock loads that might develop, nothing worse than a taper fit assembly coming loose on you mid trip somewhere.
    #6
  7. Hook74

    Hook74 Been here awhile

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    Hi, I'm Italian... I think I'll buy the extended shaft close to home or at most in Europe. Definitely with damper. I could also have it built from CNC, with no welding...but I would have to know the type of steel and heat treatment needed.
    #7
  8. bleaknessengine

    bleaknessengine Been here awhile Supporter

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    contact tagmoto, in italy, they make sweet +100 swingarms. they used to do shaft lengthening, but if they don’t now i bet they have a connection.
    #8
  9. Hook74

    Hook74 Been here awhile

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    hello thank you, I have now contacted Gletter but if I don't conclude maybe I will follow your advice.
    #9
  10. Hook74

    Hook74 Been here awhile

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    Hello,

    Does anyone know which kind of steel is indicated to build a final drive shaft? could it be 42CrMo4 ..?
    #10
  11. Hook74

    Hook74 Been here awhile

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    Hello…I found the right steel to build the extended drive shaft. (39NiCrMo3 or 36NiCrMo16 or 41NiSiCrMo7).


    It will be a 100mm extended drive shaft CNC machined, without welding.


    As a reference measurement I guess I have to take that of the R80 g/s shaft and add 100mm.


    Do any of you have a chance to take this measurement that is shown in the picture?


    42E86831-8E94-48CA-B0FC-9F4B89E85E6B.jpeg


    A curiosity, are there any airhead models with a shorter drive shaft than the R80 g/s size?
    #11