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Old 06-08-2011, 04:58 PM   #1
J117 OP
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1971 R75/5 Project

Hi there, I just picked up an R75/5 1971 old airhead to restore. I'm looking for some of you guys who have done this sort of project before and might know of some area that may be an issue.

According to the previous owner, it was running really nice when he parked it 10 years ago... with gas in the tank. Aside from rebuilding the carbs, is there anything else I should look out for?

Is there a good place for parts for these things? I'm going to be doing a full overhaul on this one, so if anyone has any ideas they are welcome! :)







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Old 06-08-2011, 05:10 PM   #2
r50us68
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Hey
I saw that on craigslist leaning up against and outside wall.
good luck to you
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Old 06-08-2011, 05:19 PM   #3
bmweuro
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I would start by checking the oil. Put some fresh gas and a battery in it and see if it fires. Make sure the fuel lines are not leaking. After that start cleaning the aluminum with mag wheel clean and Simple Green. Change all of the fluids, filters, fuel lines and ride it until the oil seals start to leak.

For parts there is;
http://www.bmwhucky.com/
http://www.beemershop.com/
and myself www.eurotechmotorsports.com
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Old 06-08-2011, 08:35 PM   #4
datchew
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I hate giving this answer and you'll hate reading it, but...

Spend a few hours digging through some of the other resto/refurb threads.
Go through the airhead tips and tricks thread.
Google a few things like valve tuning, head bolt torquing, spline lube, diode board, carb rebuild, etc.

Then take lots of pictures, notes, and ask questions as you need them.
I think you will be pleased with the knowledge around here and the willingness of folks to help.

Some of us will just be sarcastic and give you a hard time too.
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Old 06-09-2011, 07:39 AM   #5
elmoreman
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and remember...

there is no airhead more expensive than an inexpensive one.
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Old 06-09-2011, 09:19 AM   #6
Renner
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http://www.hansensmc.com/index.asp

http://bmwmotorcycletech.info/techindex.htm

www.w6rec.com

http://www.airheads.org/

congrats.
I love my lwb.
hope to get the swb together soon

ABC# 8010
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Old 06-09-2011, 12:57 PM   #7
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Thanks for the info, I'll post pics as I get going.

@ datchew I read a lot of the Air head tip and tricks forum, which was very helpful.

@bmweuro I'm gonna go get some simple green and get to work. Thanks
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Old 06-09-2011, 03:43 PM   #8
DoktorT
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Keep notes. Start a log book. EVERYTHING goes in there, starting with the VIN and a synopsis of all past reciepts you got with it.

Google SnoBum. Go to his site. Put it in your favs. Over time go there from time to time and spend some time, with log book ready to note all info relevant to your yr model. I don't care if it's a $0.49 spiral pad or Morrocan Leather bound boutiqe notebook. Paper is cheap, use lots of it.

If there is any other web site with good info, SnoBum gives it. Paper is cheap, use lots of it. DO NOT rely upon memory. It's chock full of errors and guesses and assumptions. Facts are proofed by record of empirical evidence. The older it gets, the more value it has. Memory is the direct opposite, the older it gets the less value it has for proving anything at all.

Paper is cheap, use lots of it. Oh, and I almost forgot, Paper is cheap, use lots of it.
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Old 06-09-2011, 03:59 PM   #9
Olliew72
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I think that we're in the same boat

Hey, at least your bike was in one piece.

Have a look at my restoration, it's also a 71 SWB R75/5
I've kept a log of all my costs, which I openly share with everyone (except for my wife.)

https://sites.google.com/site/1971bmwr755restoration/

Keep us posted as you go.

Chris
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Old 06-09-2011, 04:25 PM   #10
DoktorT
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Here is something on Bing Rebuilding I just found. Sounds like he was a bit of a nOOb when he started and gives a great presentation of how he got up to speed and got them right. Very well written.

http://www.ibmwr.org/r-tech/airheads/carb_rebuild.shtml

The early Bings have issues. Enough so that those in the know say to toss them and get later models. Jet them for your machine. Review the Bing Manual from Bing USA BEFORE you take the carbs apart ($11). Check the no's stamped on the side. Don't be surprized if they have already been updated.
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Old 06-09-2011, 04:28 PM   #11
bmweuro
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Quote:
Originally Posted by DoktorT View Post
Here is something on Bing Rebuilding if just found. Sounds like he was a bit of a nOOb when he started and give a great presentation of how he got up to speed and got them right.

http://www.ibmwr.org/r-tech/airheads/carb_rebuild.shtml

The early Bings have issues. Enough so that those that know say to toss them and get later models. Jet them for your machine. Review the Bing Manual from Bing USA BEFORE you take the carbs apart. Check the no's stamped on the side. Don't be surprized if they have already been updated.
I have heard this before "The early Bings have issues." I have never had a problem and I have probably had 30+ early /5's. What gives?
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Old 06-09-2011, 04:36 PM   #12
pfestus1
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Good starting point!

Ditto to what others have said, esp Doktor. Take lots of pix, and keep written records with diagrams.
I hope you ditch the fairing.
I'd bet that your /5 will start if you change the oil, drop the bottom off the carbs and spray liberally with carb cleaner, rinse the tank, and put some fresh premium in, a good battery and try it. My barn queen /5 had sat 15 years with gas in it. It started, but ran poorly, but that convinced me to restore it rather than part it out.
Here is my Barn Queen story:
http://advrider.com/forums/showthread.php?t=299144

Keep us in the loop!
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Old 06-09-2011, 04:48 PM   #13
J117 OP
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dang, some of you guys have done some sweet restorations. I got some plans for this one for sure. I will keep pictures coming, im plannin on draining the tank and changing oils tommorow and seeing if it will run; luckily the guy drained the carbs before he stored it. If I can only figure out how to get at the blasted air filter...

oh, and the fairing is soo coming off..

@DoktorT Ill be keeping my notebook handy!
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Old 06-09-2011, 04:54 PM   #14
east high
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Quote:
Originally Posted by bmweuro View Post
I have heard this before "The early Bings have issues." I have never had a problem and I have probably had 30+ early /5's. What gives?

I think it's more of SnowBum's wisdom getting spread around. My bike runs fine with the dreaded early Bings too.
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Old 06-09-2011, 05:20 PM   #15
lemieuxmc
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Love the upholstery on that seat!
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