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Thread: Customizing a '76 R90/6

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    Customizing a '76 R90/6

    Hello, new member here. I have a '76 R90/6 that I am for the most part, happy with. I has about a bazillion miles (dead odometer/speedo). I also have a non running '77 R100S that is locked up, missing parts and in general, a parts bike.

    Question is: I would like to put the front forks from the R100S on the R90/6 in order to run dual discs up front. I would also like to replace the rear drive unit to get a little more top end speed and to also be able to use the speedo/odo. There are other various and sundry items that I would like to switch over. However!!!! Would I be compromising whatever collector value that the R90/6 might have by doing this?

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    Administrator 20774's Avatar
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    Welcome!

    From this site it appears that the /6 and '77 tubes are the same type, so it should be a dead swap.

    As far as collectibility of the /6, I don't think that model is really on that kind of level...the R90S more likely, but not the R90/6. It's your "stuff"...!!
    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!

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    WI Airhead r90r100r's Avatar
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    +1 on the Welcome! I have a 76 R90/6 and the only customs on it are the Candied Red Metallic paint job and updates on front and rear shocks. Otherwise, I'm keeping the rest original. If I had a 77 R100S, I would resurrect that 'S' bike. Just my personal opinion!

    Mike Horne
    76 R90/6
    93 R100R Legend

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    I agree on restoring the S bike but there is no title, other parts are missing and the engine is seized. The R90/6 has been coast to coast. IMHO it still looks wonderful but she is truly a rider. At best, it is a $3000 bike. I just don't want to turn it into a $2000 bike. Plus by putting parts on it from a "newer" airhead, it would not be like cobbling a set of 10" over CB750 forks on it.

    The final drive that is on the /6 now is in decent shape with probably 50k miles left on it. The one on the S is an unknown quantity.

  5. #5
    Monza Blue 1974 R90/6
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    In my opinion, I don't think you would be compromising the value much because the parts you mention (forks with dual discs, rear drive, instrument cluster) don't change the stock look of the /6.

    I think where you might change a $3000 bike into a $2000 bike is if you start making a lot of visible changes so that on looking at the bike, first impression is "frankenbeemer".

    Barron

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    A standard /6 is a rider. Enjoy it for that, put as little money into it as necessary to make it work well for you (no motor hop-ups, etc), and don't look back on your decisions.
    Ride Safe, Ride Lots

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    Beemerphan Radar41's Avatar
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    Cool Just one more opinion

    Quote Originally Posted by banzaibob View Post
    Hello, new member here. I have a '76 R90/6 that I am for the most part, happy with. I has about a bazillion miles (dead odometer/speedo). I also have a non running '77 R100S that is locked up, missing parts and in general, a parts bike.

    Question is: I would like to put the front forks from the R100S on the R90/6 in order to run dual discs up front. I would also like to replace the rear drive unit to get a little more top end speed and to also be able to use the speedo/odo. There are other various and sundry items that I would like to switch over. However!!!! Would I be compromising whatever collector value that the R90/6 might have by doing this?
    I will offer another silly opinion - rebuild the 77 R100S and you will have something becoming more rare with each one which is "scraped".

    You did say the /6 runs well - Leave it alone and rebuild the "S"!!

    Seized engine? No problem - time and money for a classic!!

    Hey, you asked for opinions
    Don "Radar" Wreyford
    00 K1200LT, 98 R1100GS AE, 84 R100RS, 76 R75/6 (rebuild complete)
    MOA # 91738, RA #27032 , ABC #7915 - "Insanity is doing the same thing over and over again, but expecting different results" - Albert Einstein

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    Registered User txedomoon's Avatar
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    I'll second that -- rebuild one ride the other.
    and while you are deciding, let's see some pics of this bazillion mile /6.
    "You either run... or you rust."
    Tom Petty
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    1976 R90/6 - Berchta

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    What I usually ride around on...
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    Airhead #85 mymindsok's Avatar
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    Wel, I guess I'm going tohave to weigh in on this too!

    There are several ways to look at this but first some facts.

    The R90/6 is one of the best bikes that BMW built, bar none. Why? because 90% of the issues with the earlier bikes were fixed and when BMW went to 900ccs, everything kind of fell together. The 900's have plenty of power, great MPG if tuned correctly, they breathe well, easy on parts, They'll ru 100+ all day, etc, etc, etc. The only thing missing is dual disc brakes.

    Collectibility? IMHO, the /6 bikes are going to be the next Airheads to become solid collectibles and it's going to happen while almost everyone, is looking at something else. I'd give it five years max 'cause the bikes are dwindling in number and prices are rising as we speak. That should tell you something right there. Keep that /6 and do whatever you want with it but hold on to whatever you take off of it and don't compromise your ability to return it to stock. I owned an R90 and it was a great bike! Just terrific...!

    Yes, the R100S front end is a direct swap onto your /6 and the job can e accomlished in an afternoon if youhave all of the oarts in house and ready to go.
    Please note that there were two slightly different caliper systems for the ATE equipped bikes. The R90's used 38mm Calipers, while the R100 was equipped with 40mm parts. If I was you, I'd try to find the right hand leg and the caliper as a package deal. OTOH, if you end up swapping in the later 40mm parts, make sure that your calipers are both 40mm. Swapping to dual disks is a snap. You can usually buy the parts for $250 to $350. Watch IBMR, Ebay, ADV and the Flea market here. Just have your cash ready and jump first!

    40mm Carbs onto your R90? Forget it. The 32mm Bings are fine unless you go for Mikuni's or Dellorto's, both of which will give you somewhat better performance with a reduction in MPG.

    Those R100S's are nice bikes! They too are fast emerging as soon-to-be-collectible classics. IMHO, thats a bike worth hanging onto, even if restoring it becomes a long term project. Those 1977 R100s were imported in very limited numbers and the RS version has already taken off. Can the "S" be far behind? I doubt it. Once again, the 77 "S" is a great bike. Fast and with solid handling. The frame is stronger than the /6, they're more powerful (Especially the 1977!) the controls were updated, they're very pretty and you can still find period go-fast parts, if you look hard. CC Products in particular, marketed a host of neat items for those bikes and they pioneered punching them out to 1050cc. Don't let the idea of the engine being stuck cloud your vision. Airheads get fixed every day and if it's mostly there, a restoration could make good riding AND financial sense.

    Lastly, If you don't care about any of that stuff, you could take both bikes mix the parts together and build your own "Special". Choose whichever body style floats your boat, mix and match, bolt the R100 front end and fairing to the running R90, add a few later model parts, whatever wheels you like and SHAAZAM! Your very very own Hot Rod BMW!

    I did that and I'm pretty happy with the result.

    PS banzaibob: Please fill out you profile.

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