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Thread: who rebuilds airhead transmissions?

  1. #1
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    who rebuilds airhead transmissions?

    I'm wondering if there's anyone you guys could reccommend for rebuilding an airhead tranny.

  2. #2
    Grammarian no, Rider yes ISAMEMON's Avatar
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    oak, tom , steve prokov, do a search
    expect to pay 500+ to do it right
    my 85 he ( steve) replaced all seals, machined the shaft for the circlip, replaced all bearings, supplied ( but not installed) new netural switch, and a list of all tolerences before and after, ran me 675 2years ago

  3. #3
    From MARS
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    I had mine rebuilt by Anton Largiader in Virginia. He did the circlip, seals, bearings, and some other stuff for $615. I've put about 8000 miles on it since rebuild with no problems. This is his website: http://www.largiader.com/
    Tom

  4. #4
    Administrator 20774's Avatar
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    Also, Ted Porter, Bob's Motorwerks, and Matt Parkhouse. Probably Bob's BMW maybe Memphis Motorwerks, but I've only heard about them doing heads as of late.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
    Registered User lkchris's Avatar
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    Quote Originally Posted by Roguetek View Post
    I'm wondering if there's anyone you guys could reccommend for rebuilding an airhead tranny.
    Matt Parkhouse in Colorado Springs is closest to you.
    hobomatt@aol.com
    719.636.3633

    Since you're in OK City, you should be a member of the OK Airheads.

    Former prez John Wood had one done by Matt, IIRC.

    http://autos.groups.yahoo.com/group/OKAirheads/
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  6. #6
    Motorcycleton
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    If you feel up to doing the transmission re-build yourself or just want to see what is involved - there is a nice video available from Cycle Works -

    http://www.cycleworks.net/index.php?...roducts_id=243

    The video covers both the 4-speed and 5-speed airhead transmissions as used in the /5, /6, and /7 bikes (likely newer as well, but I haven't gone there - yet). I watched the part on rebuilding the 5-speed transmission several times and then jumped in and re-built my /7 R100RS transmission.

    I was able to go to Re-Psycle BMW for bearings, seals, and a good used intermediate shaft (damaged engaging dogs on original transmission). I got the parts to upgrade the shift mechanism (sometimes referred to as the "shift kit upgrade"). I was also able to talk to the folks at Re-Psycle about the disassembly / assembly process. Re-Psycle sells re-built transmissions for about half the price of a new unit.

    I obtained the shim kit from Cycle Works. I was able to borrow the plate used to make measurements to determine the amount of shimming necessary - the local BMW dealer where I've purchased many bikes loaned me the plate. I've since purchased my own plates for 4-speed and 5-speed transmissions.

    My re-built transmission has worked very well. I routinely use Dow Gear Guard M with Valvolene 80W-90 transmission oil for smoother shifting.

    In a couple of weeks from now there is going to be a tech day at a fellow airhead's house in Columbus, Ohio. Featured in the tech session will be the re-building of a 4-speed transmission. With the kick starter, the 4-speed transmission is a bit more fiddly than the 5-speed unit. Here is a link to the Airheads.org website with the announcement of the aforementioned tech day -
    http://www.airheads.org/component/op...,10/Itemid,40/

  7. #7
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    OK, I"m looking at trying to rebuild a 77 5 speed. the 3/4 shifter fork rod is sloppy, and has wear, and rust pits. which means it has to be replaced. ( this is the same one that my boss drove out of the case cold... ) So. the case appears to be fine, no cracks, or any signs of damage from my employer's enthusiasm.

    I have access to a machine shop, so I'm thinking of making a new 3/4 shifter fork rod from scratch. as far as the case hole not being the right size, I can clean up the hole in the case, and make a new fork rod.

    my other thought was to drill and tap a hole in the back of the fork rod, and put a flat bolt in it, to keep it from being able to creep into the case.

    thoughts?

    or just buy a new case, put all the bits in a box, and ship it to someone who knows what they're doing?

  8. #8
    1982 R100RT 41047's Avatar
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    Tranny Rebuild

    I had mine(1982R100RT) rebuilt after the pawl spring broke. Dave Bork, Grass Roots BMW, Cape Girardeau, MO. did the work. Dave is an authority on airheads and truly a professional. I would highly recommend him.

  9. #9
    Little Egypt Airheads
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    Quote Originally Posted by 41047 View Post
    I had mine(1982R100RT) rebuilt after the pawl spring broke. Dave Bork, Grass Roots BMW, Cape Girardeau, MO. did the work. Dave is an authority on airheads and truly a professional. I would highly recommend him.
    I concur. I've know Dave for 50 years (yes, we're both that old) and, ahem, I'm the one who introduced him to BMW's in 1975 when he worked for me and I bought a brand-spanking new R60/6. Grass Roots BMW and Dave are highly recommended.

    Little Egypt Airheads
    1952 R51/3
    1966 R50/2
    1977 R75/7 - for sale
    1980 R100RT

  10. #10
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    Guenther Wuest

    FAST by Guenther
    6891 W. U.S. Highway 150
    Fredricksburg, IN 47120

    wuest "@" blueriver.net

  11. #11
    ONE LESS HARLEY 04R1150RS's Avatar
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    Quote Originally Posted by wuli959 View Post
    Guenther Wuest

    FAST by Guenther
    6891 W. U.S. Highway 150
    Fredricksburg, IN 47120

    wuest "@" blueriver.net

    He recently rebuilt mine and it works great, 6 month warranty.
    Richard
    2004 R1150RS
    1984 R80 G/S
    2003 Suzuki DRZ 400S

  12. #12
    ABC,AMA(LIFE),MOA,RA,IBMW MANICMECHANIC's Avatar
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    John did the tranny for my /6 very recently and it does so much better than an Airhead trans usually does.
    F.O.G.Rider, Rounder #6,
    Ambassador, Biergarten co-chair
    BMWRA Wisconsin Region Rep, camping chair

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