airhead parts - the dark secrets revealed

Discussion in 'Airheads' started by datchew, Feb 24, 2007.

  1. oz_airhead

    oz_airhead Been here awhile

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  2. Kai Ju

    Kai Ju Long timer

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    The lens pattern is for what looks to be RHD countries.
  3. disston

    disston ShadeTreeExpert

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    These were available last year but the guy sold out. Not sure if this is the same guy. Terrific deal. I think they weer even cheaper last year.
  4. boxerboy81

    boxerboy81 Stay Horizontal

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    They were less than $50 last year! Sold like hotcakes!
  5. frasermanx

    frasermanx Adventurer

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    I tried to get the Hastings rings as suggested by Lornce, my neighbour but part number changed or not available. I did check the website also but no love.

    My VW Porsche mechanic is very familiar with these engines and offered these rings which do fit and seem to be right.

    However I am used to rings being tighter in the bore and these measure .025" in the bore. But no rings are offered as oversize unlike for cast iron barrels which are sold .025" over. I believe BMW OEM rings for /7 have oversize too.

    Sooo going to use them. Tell me I should --- please !!

    Here is a pix of the box. Dont know the maker but maybe your supplier can read the barcode and get some for you too ! ooops not allowed to upload attachments

    Fraser in Toronto
  6. Wirespokes

    Wirespokes Beemerholics Anonymous

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    Call them! They're very helpful and probably have something for you - even if they have to make them up.
  7. italiano

    italiano Been here awhile

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    i have used them with no luck, the ring has not the same shape as the original and the oil ring is different too.
    they work but with lower compression, if you have the money the original ring is much better.
    also from 81 the barrels are cover with nikasil, very unlike you have any need to oversize rings

    i put nikasil barrels from ebay, my r 100 is from 78, you can swap them, used and with std rings
    now is working well and does not burn oil
  8. Donny1973

    Donny1973 Been here awhile

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    Anyone know if the aluminum /5 shock covers are being reproduced?
  9. Caddy82rats

    Caddy82rats Long timer

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  10. DiabloADV

    DiabloADV Semi-Occasional

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    I need a dowel pin for the front bearing carrier: 07 11 9 942 050. The guys at Max say it's not available anywhere from bmw. Any ideas on where to get it, or what to use instead?

    Edit: or does one reuse the old pin?
  11. Kai Ju

    Kai Ju Long timer

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    Unless the dowel pin was damaged during removal you should be able to reuse it. In most applications dowel pins are there to align critical parts and to keep the parts in alignment when the engine is running.
    So, if the dowel pin is a good fit in both halfs of the hole, go for it.
    Also, dowel pins are under shear load, not compression or tension so if it's perfectly cylindrical, with no visible or measureable step you're good to go.
  12. DiabloADV

    DiabloADV Semi-Occasional

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    Thanks. I'll go that route.
  13. sledder

    sledder Adventurer

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    After following one of the Motobins hints and tips for an r80 that doesn't like the cold I found the jet they describe, mangled it whilst trying to get it out and then dropped it down the plug hole when rinsing it after cleaning. So, I need a new one. Trouble is, no-one knows what they are called or stocks it. Does anyone know the definitive name or part number for this item? Or do they have a pair that I could buy?

    Motobins 'Easy cold starting'
    "Easy Cold Starting, immediately followed by cutting out, can often be caused by a partially-choked cold starting jet. These jets are fitted in the bottom of the float chamber, at the base of the auxiliary chamber from which the starting carburettor draws its fuel. Their purpose is to restrict the rate of fuel flow immediately after a cold start, so automatically weakening the mixture. Should even one become partially blocked, that cylinder will not continue to run when cold and the engine will usually stop. Remove and clean these jets, particularly if the float chamber shows signs of corrosion due to water ingress etc."
    http://www.motobins.co.uk/motobins-hints-and-tips.php

    Chris Harris mentions them in his carb disassembly video at 7:00, "there's a jet here, for the choke circuit."
    http://www.youtube.com/watch?v=Q__LkgoaGGk
  14. disston

    disston ShadeTreeExpert

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    Go to this web site; http://maxbmw.com/

    Then click on the box on the bottom of the page that says "Parts". Next page click on the box that says "Fiche" Next you will have to select the model. R80 has 7 different models. Chose the appropriate one. And you will find yourself on the pages of the parts micro fiche diagrams. You should be able to figure this out from here. Most all of the parts you may need are available and Max BMW is a good source. The prices they list are the prices they charge. They will charge something for shipping but it's pretty reasonable i think.

    You have started this thread in the wrong place. The tips and tricks thread is not for this kind of question. Right below is the main body of Airhead threads and you should start your own thread there. Title it something relevant, like "R80 Carb part Lost?"

    I will be very interested to hear about dropping this part in the "plug". If you mean it went into the spark plug hole? Then you are not going to like the advice you get. The cylinder head will have to come off to remove the part from the combustion chamber.

    If you are talking about the small jet in the float bowl then it is cleaned it is not removed. If you lost one you will need to find another float bowl maybe. That part is not available.

    Try to be a little clearer often pictures help. And please mention the year of the machine.
  15. Zebedee

    Zebedee Been here awhile

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    There's an exploded diagram of the typical Bing carb floating around somewhere which has part name/numbers. Unfortunately I can't get to my copy for a couple of weeks, but one of the other inmates might also have a copy ... :deal
  16. sledder

    sledder Adventurer

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    My bike is a 1985 R80 RT. I was referring to the plug hole of my sink, don't worry I didn't drop it in my bike.

    Apologies if my question is in the wrong the thread, I thought it was a similar question to those posed earlier.

    It's quite hard to describe the part as it seems to have no name. I provided a link to a YouTube video that clearly shows a mechanic removing it from the float bowl, that's the best reference I have.

    I have a Haynes manual and have looked at many Bing schematics but none of them show this part. I now wish I hadn't removed it, but it is threaded and is notched for a flat-head screwdriver so deserves to be cleaned with the other jets IMO.

    I'll try MAX, thanks for the link.
  17. disston

    disston ShadeTreeExpert

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    OK, sorry I missed the video of the jet. That is one of the removable choke jet carbs. You shouldn't have to remove it. It only needs cleaning. Since you lost one somebody here may have one. Or you may get another float bowl. Remember the float bowls are side specific.

    The Bing USA agency may sell you one. You'll have to call them or send them an Email. http://www.bingcarburetor.com/

    Start another thread we will then transfer our posts and delete the stuff in the tips and tricks thread. This thread is for posting methods and trips and tricks that you have discovered to make things work. Or that's what i thought it was.

    You bike will start and run with that jet completely missing. Turn the chokes off when not needed it will be running rich until you turn the chokes off but it will work. And since the chokes don't do anything when off it should run fine with that part missing.

    Edit; The Dark Secrets Thread. Same as the Tips and Tricks Thread.
  18. Wirespokes

    Wirespokes Beemerholics Anonymous

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    I'd like to know if that jet is available separately - I thought it wasn't.

    BTW, the solution to this problem is actually pretty easy: unscrew the trap from your sink drain and in the bottom of it you will find the missing jet.
  19. rider58au

    rider58au Adventurer

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  20. Pokie

    Pokie Just plain Pokie.

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    Choke jet, I did not measure them but they sure look like the same ones used for the pilot jets on a /2 carb.