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Thread: 1975 R90/6 Gas cap

  1. #1
    Registered User zenduddhist's Avatar
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    1975 R90/6 Gas cap

    Is the gas cap chrome or polished aluminum?
    1969 Triumph Bonneville T120R, 1972 Commando 750, 1974 Vespa Rally 200, 1974 Commando 850, 1975 Commando 850, 2010 Triumph T100 w/sidecar, 2011 BMW R1200RT, 2013 Honda CB1100

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    Curmudgeon nrpetersen's Avatar
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    On mine it's chrome.
    Retired w 2005 K1200LT, 2000 R1100RT, & 1975 R90/6

  3. #3
    Registered User zenduddhist's Avatar
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    That's what I was afraid of. Mine is not in good shape, cosmetically. I was hoping it was polished aluminum and then I could just polish it up.

    Anyone know where to get non-locking OEM gas caps? MaxBMW only has the locking ones.

    Thanks,

    Chris
    1969 Triumph Bonneville T120R, 1972 Commando 750, 1974 Vespa Rally 200, 1974 Commando 850, 1975 Commando 850, 2010 Triumph T100 w/sidecar, 2011 BMW R1200RT, 2013 Honda CB1100

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    Registered User lmo1131's Avatar
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    Dare I say it. .. .. . eBay. But it may take a while, I've purchased two that way.

    Internet BMW Riders Marketplace is taking a beating lately, but I've had good luck posting "want to buy" ads.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  5. #5
    Registered User lmo1131's Avatar
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    Here's one on eBay right now. $107; buy it now price. Looks to be in pretty good shape.

    http://www.ebay.com/itm/BMW-5-Alumin...e409d2&vxp=mtr

    Here's another that's been cleaned and polished, for $149; buy it now price.

    http://www.ebay.com/itm/BMW-5-Alumin...5c0331&vxp=mtr
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  6. #6
    Registered User zenduddhist's Avatar
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    Quote Originally Posted by Lmo1131 View Post
    Here's one on eBay right now. $107; buy it now price. Looks to be in pretty good shape.

    http://www.ebay.com/itm/BMW-5-Alumin...e409d2&vxp=mtr

    Here's another that's been cleaned and polished, for $149; buy it now price.

    http://www.ebay.com/itm/BMW-5-Alumin...5c0331&vxp=mtr
    Thanks for the reply, Lou, but I have a /6 and those gas caps are /5. But thanks anyhow!!
    1969 Triumph Bonneville T120R, 1972 Commando 750, 1974 Vespa Rally 200, 1974 Commando 850, 1975 Commando 850, 2010 Triumph T100 w/sidecar, 2011 BMW R1200RT, 2013 Honda CB1100

  7. #7
    Registered User lmo1131's Avatar
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    /5 or /6, it shouldn't make any at all difference Chris. The only difference between the /5 and /6 tanks are on the underside (for master cyl clearance).

    The locking cap that MAX offers [16 11 1 232 348] fits either model. MAX's part number ref list this part number as OEM from 08/1969 - 06/1976

    Read > http://w6rec.com/duane/bmw/tank/index.htm
    Last edited by Lmo1131; 09-04-2012 at 09:36 PM.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  8. #8
    Registered User lmo1131's Avatar
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    The $108 one looks like it's in good condition. It doesn't have the pin, but they're available from MAX. $149 is pushing it... and the finish on that cap, doesn't look to be that well done.

    They're really easy to polish ... starting with 320 grit sand paper and water and working up to 800-1500 grit and finishing with Simichrome polish.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  9. #9
    #4869 DennisDarrow's Avatar
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    Lew.......Thanks a bunch for passing along the $108 item. Been watching for one for several years now. The chrome on my 76 has seen much better days and rechroming is next to impossible........so.........The aluminum ones are so much better as it is totally nothing to buff up and look great......YES....I jumped in and got it so it should be here very soon.........Anyone want a used chrome one????..............lol........God bless.........Dennis

  10. #10
    Registered User lmo1131's Avatar
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    Good on ya Dennis!

    I hope you waited until the last twenty seconds to swoop in on that. That's when it's most annoying to the guy that's been watching it all week...

    Make sure to drive the old hinge pin out in the right direction. It's kind of hard sometimes to tell which end of the pin has the serrations on it.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  11. #11
    Registered User dmftoy1's Avatar
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    Quote Originally Posted by Lmo1131 View Post
    The $108 one looks like it's in good condition. It doesn't have the pin, but they're available from MAX. $149 is pushing it... and the finish on that cap, doesn't look to be that well done.

    They're really easy to polish ... starting with 320 grit sand paper and water and working up to 800-1500 grit and finishing with Simichrome polish.
    I've got one with really minor pitting. Is it possible to use this technique to get rid of them w/o screwing up the chrome? Would love to save the cost of replacing it. (have a bunch of other chrome I'd love to revive as well!!)

    Thanks,
    Dave

  12. #12
    #4869 DennisDarrow's Avatar
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    There is a huge difference between cleaning up cast aluminum and chrome plated parts by getting it to shine by using finer and finer abrasive polishes........This works to a point with chrome until you go through that thin chromium plated layer and go into the base metal..........Good luck and God bless.....Dennis

  13. #13
    Registered User lmo1131's Avatar
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    Dave, it would depend on what "minor" pitting is. Barkeepers Friend contains oxalic acid and does a really good job of removing rust and oxidization, but it won't remove the pitting. Just making a paste with some water and applying it with a soft cloth should do the job since it's the acid that's doing the work. Works great in the kitchen too!!

    And you'll not have too much luck trying to sand/polish out chrome - too hard.

    Base metal on those "chromed caps"? I'm guessing die-cast zinc? Die cast aluminum, possibly? Dennis?

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

    Lew Morris
    1973 R75/5 - original owner

  14. #14
    Registered User dmftoy1's Avatar
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    Well the Pitts are visible to the naked eye (barely) and definitely catch a thumbnail. I'll give that a sot and pray.

  15. #15
    Registered User 163750's Avatar
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    R60/6 Cap

    Simply sanded it down and buffed it out on a wheel attached to my bench grinder. Sweet looking now. Was going to clear coat it, but now I have something to actually polish on the old battle wagon. What do you have to lose?
    AirMonger

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