airhead parts - the dark secrets revealed

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

  1. CurlyMike

    CurlyMike Formerly SaddleSoar

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    I have had one for about 2 years now and works flawlessly. Spend the money to get the new diode board as well. Both are great and Rick is great to work with.
  2. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    Have you priced a new OEM bean can lately Chris?
    $586.73!:eek1 The Alpha is only $299.95 and it's rebuildable. A very sturdy unit from the looks.
    That's one reason I bought it. Hoping this module thing pans out. :norton
  3. Boxer Metal

    Boxer Metal Mad Scientist

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    Not sure what I was looking at. Maybe to many beers that night:D
  4. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    Well, got the new module in, Rick is a man of his word.
    Everything seems to be as it should be. I think I fially have it semi-dialed. Runs like a snotted calf. :freaky
  5. Tripletreat

    Tripletreat Been here awhile

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    My 1988 R100GS has #45 pilot jets. I'd like to go one size richer, but my local BMW dealer does not sell such a thing (?). The parts fiche doesn't even mention the jet size(s). The Bing Carb website doesn't mention Bing carburettor jets either. What's up with this? Surely a range of pilot jets is available, but where?
  6. rkjjeep

    rkjjeep Been here awhile

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  7. boxerboy81

    boxerboy81 Stay Horizontal

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    A 50 idle jet should be available as they were used on the 75/6 and R80.

    Why one bigger?

    Part No.60464 for a #50 @ Motobins.

    Idle jet, aka mixture screw. Is that what you mean by pilot jet?
  8. Lomax

    Lomax Nanu-Nanu Adventurer

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    I have an 84 R100RS and picked up a Browns side stand for it.

    It has had the Supertrapp exhaust system on it since new and if possible I would like to leave it on there.

    BUT the Supertrapp exhaust is a lot bigger in diameter that the stock exhaust and the Browns side stand will not fit over the top of it and have enough room to bolt to the engine mount.

    I am looking for any advice anyone has on what to do here.

    I guess it may come down to putting the stock exhaust back on if I want to user the Browns side stand, or keep using the stock side stand if I want to keep the Supertrapp, But I am fishing for any other options.

    Here is what the exhaust looks like on the bike.

    [​IMG]

    Thanks.

    Marc
  9. DoktorT

    DoktorT BigBrowedNeandereer

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    Do get the Bing Manual from Bing. It lists all the jet sizes and all parts available for all OEM applications. $11 is chump change for all details in depth for all the Bings, both slide and CV's of every type. Step by step, function, teardown, reassembly, setup and tuning.
  10. rkjjeep

    rkjjeep Been here awhile

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    I've always been able to make my R100GS's run "right" with the stock jets, all around. Even with a 45 pilot the mixture screw is only out about 3/4 turn. I have seen the 48 pilot richen up the just past 1/8 throttle transition to the mid range circuit for a little better driveability there. Make sure your 45's are whistle clean, and then I wouldn't ever go bigger than a 48.
  11. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    What's the clearance issue? The clamps too small?

    Can you use spacers some how? The frame bolt is actually an engine bolt that can be pushed/pulled either side. You might try finding an earlier model bolt that's longer.
    [​IMG]
  12. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    Got my new module from Rick. With that and the corrected timing, the bike is running famously! All good. :norton
  13. Tripletreat

    Tripletreat Been here awhile

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    The transition from idle to acceleration has a rather flat spot which seems to suggest leaness. Once the needle/needle jet begins metering it all works well. I did pull the pilot jets and verified they are clean. I'm gonna run some sea foam through a tank of fuel and see how they respond. The carbs are probably due for a proper rebuild as they have a lot of miles on them, but that's something I'd rather due next winter. Summer's for ridin'!

    It's not a big deal, just something I noticed again when I was prepping the bike for my grand SW Tour. To a certain extent the flat spot has always been noticeable, I just never got around to trying to tune it out.

    Tomorrow I'll set off for a big loop down western Nevada/eastern Califa toward 4-Corners and points east, then up through the Rockies before heading west to Idaho again. I'm kinda worried about the wildfire in northern Arizona. It looks like that will figure greatly in our plans/route.
  14. mark1305

    mark1305 Old Enough To Know Better

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    rkjjeep said in his sig line: "Current ride is 1995 R100GS PD Classic that I could not afford new and can almost afford now. 30 airheads have come and gone and over 70 other bikes as well. When my wife gives me a hard time about the hundred or so bikes I just tell her to be damn glad they weren't women."

    Well said! :clap That's worth quoting.
  15. Lomax

    Lomax Nanu-Nanu Adventurer

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    thanks for the advice. The clearance issue is with the bigger pipes the stand mounting bracket will not fit within 1/4 inch of the engine mount.

    My latest thought is to take some flat stock and mount it between the front and rear engine mounts. Then mount the side stand to the plate.

    You also have a good idea with moving the mounting bolt over more to the left side and using a spaced. I will look into that.

    Marc
  16. DoktorT

    DoktorT BigBrowedNeandereer

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    I installed a Brown on my 79 RS. The stock bolt will work, but leaves one thread unloaded on each side. Not long enough to add any extra washers or spacers. Also, after installing I was have all kind of issues getting into 1st gear. The shift lever was hitting the Brown mount plate. The later Browns have a nicely curved relief in the plate to prevent this. I massaged mine with a grinder to provide clearance and all is well.
  17. wirewrkr

    wirewrkr the thread-killer

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    Actually, the later ones do NOT have a relief in them.
    That has been an issue for several years now.
    Browns was not real concerned and indicated to me when we spoke that there wouldn't be any changes made to this.
  18. DoktorT

    DoktorT BigBrowedNeandereer

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    I'm just shaking my head in disgust. The manufacturer knows of the problem, but still sells it to the masses. Machine time ain't cheap, but that divot can be automated (CNC) and they could spit them out right at about 30 seconds machine time each. Manually it could be done by any journeymen in 5 minutes.

    The have done it. Cruised around the Redmond rally last year specifically looking for Brown stands on /7's. Saw a few like mine, owner install with the ground out area. Then I saw looking near new, a chrome Brown with the divot requied perfectly radiused. I thought oh, good, they are making them right now.

    Why would they revert back to WRONG?? To save $2 machine time?? Fouling the shifter can become very dangerous. It's not just engaging 1st, it also affects downshifting at speed in higher gears.
  19. wirewrkr

    wirewrkr the thread-killer

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    If it was chrome it was a copy, unless some crazy bastard spent the money.
    Browns were not chromed. Luftmeister copies were.
  20. DoktorT

    DoktorT BigBrowedNeandereer

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    Yes, it had all the appearance of the Brown but chrome of the quality expected of good process. Luftmeister must have got permission/license to do their production. Sounds like that is what it was, then Luftmeister improved the design with the proper relief and chrome finish. In all other ways it looked exactly like the Brown.

    Also, there would be no great difficulty in taking a brown, adding the relief properly on a mill and having it chromed.