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Thread: Tail light woes R90/6

  1. #1
    Superkraut typ181r90's Avatar
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    Tail light woes R90/6

    Well, as of yesterday I've broken my 2nd tail light housing in 5 years. Both times it appears that a crack was probably developing around the area where the housing bolts to the rear fender and then one good bump finished off the job. Again, both times I didn't even realize anything was broken until I arrived home which I'm sure only multiplied the damage. Anyone else have an issue like this or is it just me? I figure it's just wear on brittle 39 year old plastic, but after the first time I reinforced the area inside the housing and below it with another metal strip and it still occurred.

    Now I'm just scrapping the stock tail light for a metal aftermarket piece that I'll be mounting to the frame instead of the rear fender which will entail making my own mounting bracket, but that's not a big deal.
    // 1975 BMW R90/6 (cafe'd) // 1957 BMW R60 (in pieces) // 1967 Aermacchi/H-D Sprint 250 SS (custom special) // 1973 VW Type 181 Custom SOLD )

    http://symphonyofshrapnel.blogspot.com

  2. #2
    Registered User lmo1131's Avatar
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    The tail light housing on my '73 /5 is still going strong after 40 years. I modified my set up to include a strip of rubber between the metal strip ( #3 (under the fender)), and another rubber strip between the turn signal rear bracket (#1) and the housing (#7). Plastic tends to try and "cold form" when clamped down hard; when that happens it starts to get brittle - it's a form of work-hardening. I also used "fender washers" on under the nut on the inside with rubber washers under them.



    >>>>>>>> 250 Aermacchi. spooge.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  3. #3
    Superkraut typ181r90's Avatar
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    Quote Originally Posted by Lmo1131 View Post
    The tail light housing on my '73 /5 is still going strong after 40 years. I modified my set up to include a strip of rubber between the metal strip ( #3 (under the fender)), and another rubber strip between the turn signal rear bracket (#1) and the housing (#7). Plastic tends to try and "cold form" when clamped down hard; when that happens it starts to get brittle - it's a form of work-hardening. I also used "fender washers" on under the nut on the inside with rubber washers under them.



    >>>>>>>> 250 Aermacchi. spooge.
    Everything you said makes sense, but I think I'm done with the plastic. Bought an old Hella one, similar to the style used on the old K??belwagens and Unimogs that's all metal. Also, going to lose the rear fender and cut stainless sheets for the subframe so I don't ruin my seat or battery compartment while I'm at it. Just to show what I'm dealing with as far as the stock ones are concerned.

    taillight.jpg

    The one on the bottom is the original, which I stopped using after the first crack/separation. The one on the top is the replacement, which, as I mentioned earlier, I reinforced with metal strips on the inside of the housing and where it attached to the fender. I wasn't baja'ing with the bike or anything, just normal street/highway traffic with the occasional bump.

    As for the Macchi, that's something else... Was going to restore it, but really hated the "sportster" look of it so I went an entirely different route. Now it's got a Benelli tank and a lot of Italian race stuff that's sitting on my shelf while I wait for some other stuff to arrive. I have a build thread and miscellaneous ramblings located HERE
    // 1975 BMW R90/6 (cafe'd) // 1957 BMW R60 (in pieces) // 1967 Aermacchi/H-D Sprint 250 SS (custom special) // 1973 VW Type 181 Custom SOLD )

    http://symphonyofshrapnel.blogspot.com

  4. #4
    Registered User ebeeby's Avatar
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    Time to balance those carbs!

  5. #5
    Superkraut typ181r90's Avatar
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    Quote Originally Posted by EBEEBY View Post
    Time to balance those carbs!
    Hah! Wouldn't that be an easy fix! In all seriousness my carbs are probably the most sorted part of the bike and even with a Swiss cheese looking lightened flywheel my airhead is still smooth and ticking like a Rolex.

    My buddies all have triumphs and those are a whole other story. One of them shakes so badly it sheared the head off the magneto drive, twice...
    // 1975 BMW R90/6 (cafe'd) // 1957 BMW R60 (in pieces) // 1967 Aermacchi/H-D Sprint 250 SS (custom special) // 1973 VW Type 181 Custom SOLD )

    http://symphonyofshrapnel.blogspot.com

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