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1973 R75/5 Rebuild Project Journal

Bing carb rebuild

:thumb:thumb:twirlFantastic rebuild documentation. Thank you so much. I'm in the process of restoring a 1974 R90/6 with a Velorex 562 sidecar. Your post comes along at just the right time.
 
Great documentation on the rebuild. I have only one comments. The screws are peened on the butterfly to prevent them from accidentally backing out and getting sucked into the engine. As such, the backs of the screws need to be filed down to prevent stripping the threads on the throttle shaft. DAMHIK The shafts themselves are not very expensive ($10-15ea), so it's not the end of the world if you do strip them.

When installing the new screws, they should be peened or others (including myself and the OP) have used loctite. According to the experienced people/guru's I've talked to blue loctite is more than adequate for this application. Red loctite, I've been told, is overkill in this situation. Some people do not recommend using loctite, and peen their screws.

Anyway, great write up and keep up the rubber side down.
 
Jeff,

You are absolutely correct on the peening of the screw. Preventing them from mangling the threads in the throttle shaft makes perfect sense.

Red loctite is "permanent" locktite IMHO :)

You are correct about the shaft (13 11 1 336 585) being pretty inexpensive.

Thanks for reading this over and providing your input.

Best.
Brook.

Great documentation on the rebuild. I have only one comments. The screws are peened on the butterfly to prevent them from accidentally backing out and getting sucked into the engine. As such, the backs of the screws need to be filed down to prevent stripping the threads on the throttle shaft. DAMHIK The shafts themselves are not very expensive ($10-15ea), so it's not the end of the world if you do strip them.

When installing the new screws, they should be peened or others (including myself and the OP) have used loctite. According to the experienced people/guru's I've talked to blue loctite is more than adequate for this application. Red loctite, I've been told, is overkill in this situation. Some people do not recommend using loctite, and peen their screws.

Anyway, great write up and keep up the rubber side down.
 
Cool beans. Glad this was timely. Check out the the other post I added today with the documentation for the rebuild of a 1975 R75/6. Could be some things there that are useful.

Best.
Brook.

:thumb:thumb:twirlFantastic rebuild documentation. Thank you so much. I'm in the process of restoring a 1974 R90/6 with a Velorex 562 sidecar. Your post comes along at just the right time.
 
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1973 R75/5 Fork Rebuild Post

Folks,

I just posted material from my experience rebuilding and refinishing the forks on my wife's 1973 R75/5.
http://brook.reams.me/category/mc-rebuilds/

Here's a look at before, and after.

<a href="http://www.flickr.com/photos/brook-reams/8315667405/" title="Faring & fender off by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8080/8315667405_56a8d7a9e0.jpg" width="375" height="500" alt="Faring & fender off"></a>
Getting Started

<a href="http://www.flickr.com/photos/brook-reams/8404891633/" title="Fork slider details by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8095/8404891633_9fb1c0b85a.jpg" width="500" height="375" alt="Fork slider details"></a>
Sliders Disassembled

<a href="http://www.flickr.com/photos/brook-reams/8427858701/" title="After Rebuild & Polishing by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8093/8427858701_0312131164.jpg" width="500" height="375" alt="After Rebuild & Polishing"></a>
Rebuilt and Refinished

Enjoy. Feel free to add any comments and tips to the my project web page if you wish.
 
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Plus on your work, the clean work space and the great web page.

Thanks for the kind words. It takes me 1/2 as long to work on a project if I don't have to keep looking around for what I need. And as I get older, I have to look around much longer to find stuff I just had in my hand ..:laugh
 
What's on your floor? Is that rubber mat? Expensive?

Hi Rob,

I got this from these folks in Grand Junction, CO., Garage Flooring, LLC.
http://www.garageflooringllc.com/blt-garage-floor-mat/

The BLT product is available from a number of distributors. I bought a 9' x 20' roll @ $425 plus $21 shipping.

It makes the shop quieter, it keeps parts from bouncing as much so they don't richochette into some dark corner, and it makes it very easy to clean up oil and grease. A drawback is when you put a bike on the center stand for awhile, it makes a dent in the mat. I had some spare scraps and used a small piece under the center stand at first, but then I found aluminum diamond tread at a local outlet and picked up a couple 0.125" by 1' x 2' sheets that I use under my bike's center stands and a 2' x 2' sheet I use near my work bench. I picked it up from these folks who are in Denver, CO. I suspect you can find a local supplier near you.
http://www.cutsmetal.net/

The mat and aluminum diamond tread works great. As you can see, I have my R1150-RS apart right now getting the Ohlin's shocks rebuilt.

IMG_3599.jpg

IMG_3600.jpg
 
1973 R75/5 Wiring Harness & Electrics Disassembly Post

Folks,

I just published a new web page for the project on this topic. Here's the blog post with link to the web page showing detailed pictures
http://brook.reams.me/2013/02/17/1973-bmw-r755-removing-the-wiring-harness-and-electrics/

Here are a couple pictures.

<a href="http://www.flickr.com/photos/brook-reams/8391353848/" title="Starter Relay, Front Side Wiring Detail by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8218/8391353848_647fbaeb19.jpg" width="500" height="375" alt="Starter Relay, Front Side Wiring Detail"></a>
Starter Relay Wiring

<a href="http://www.flickr.com/photos/brook-reams/8482103637/" title="Tail Light Wiring Diagram by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8524/8482103637_8065860e58.jpg" width="500" height="375" alt="Tail Light Wiring Diagram"></a>
Taillight Shell Wiring Detail

<a href="http://www.flickr.com/photos/brook-reams/8391354182/" title="Wire Loom Detail - Rotting Rubber by ScooterScum_52, on Flickr"><img src="http://farm9.staticflickr.com/8236/8391354182_2e5dcb85bb.jpg" width="500" height="375" alt="Wire Loom Detail - Rotting Rubber"></a>
Rotting Wire Loom Routing Detail

All the web pages for this project are listed on the right side of my site with short summaries in the MC Build Projects category page.
As always, comments, tips, tricks and "did you know you could have ..." comments are welcome. Feel free to post them on the web page.

I hope you find this information helpful.

Best.
Brook Reams
 
Thanks Brook - freshening up a '73 R60/5 & taillight frame needs repainting - was a little alarmed when I sar all rose wires crammed in the receptacle!
 
Thanks Brook - freshening up a '73 R60/5 & taillight frame needs repainting - was a little alarmed when I sar all rose wires crammed in the receptacle!

Hi Ken,

Indeed, but wait until you look inside that headlight shell. I'm going to leave well enough alone and stay out of that rats nest as best I can. :)

Best.
Brook.
 
1973 R75/5 Tear Down to the Frame

Folks,

I just posted a blog, 1973 BMW R75/5: Tear Down to the Frame, showing the tear down of my wife's R75/5 down to the frame.

You will find links to other sections I've written on this project on the right side of the page. Feel free to post any comments, questions, tips, etc. I greatly appreciate the feedback, and I hope this information is helpful.

Here are a few of the pictures I took along the way.

8315670175_57b1eb3da9.jpg

In the Workshop Before the Tear Down

8315665633_84957f7024.jpg

Me with Fairing, Seat, Tank and Front Fender Off

8390270381_39ff5ec63a.jpg

Wiring Harness Removed from Frame and Engine

8443616622_04435e96d0.jpg

Ready To Remove Swing Arm, Transmisson and Engine

8463715764_c547771c55.jpg

Engine Out of the Frame

8463715666_99d37ee214.jpg

Naked Frame Ready for Powder Coater


Best.
Brook Reams
 
I'll keep an eye on your blog for helpful eye candy. Your project might answer questions I run into like,"where does this go"? My basketcase 1973 R75/5 came to me in boxes & I work on it as I also do 2 other vintage bikes at the same time & as time allows. Having never fully taken down an airhead there are reassembly questions that will come about, I'm certain of that. FWIW, my frame will get KBS "Black Top"satin black chassis paint based on quality of the paint,cost(the paints pricey-I'm the cheap part:laugh) & the fact that I do it in my shop & not a send out as is powder coating. I know many use powder coat for bike frames but I see many failures of powder coats on commercial applications so it's not for me. I read a coatings engr's comments on another site that made the point that it's simply another way of coating cure,i.e., heat vs. solvent. I have my fenders & tank ready for primer now. The headlight bucket is sitting on a workbench while I try to decide whats the best way to repaint it and not suffer too much trauma to get the wire jungle back inside! I'm leaning toward a "leave it mostly wired and mask off" approach. I'm doing my stripes with 3M fineline striping tape where you "peel away the white line areas" and have striping paint and brush to fill in stripes. I'll "finish the end" of each stripe with a flourish to suggest that it's a hand applied stripe as that's about as close to a hand striper as I'll ever be.
 
kantuckid,

Thanks for looking and sharing about frame painting. What attracted me to powder coating is the ability to cover round tube completely and to have a hard finish. I've spray painted them and never seem to get the uniformity I'm after ( read that, missed areas).

I'm very interested in your comment about 3M fineline striping. Can you provide a link to that product? I'm going to paint the bike myself (as I did on my R75/6 "S" replica project) and this time, I want to do painted pin stripes.

I hope some of my pictures help you on your project.

Best.
Brook.
 
Thanks for posting Brook. Excellent photo-journalism.

May I make a suggestion .... consider posting your blog "notices" in the same MOA topic. That way all of your information will be readily at hand in one location. Down the road, the only way to find this Tear Down article (for example) will be to use the Search feature ... which is not too specific with it's return information.

Shane Balkowitsch's Complete Restoration of BMW R75/5 into Cafe Racer project is a good example.
 
Thanks for posting Brook. Excellent photo-journalism.

May I make a suggestion .... consider posting your blog "notices" in the same MOA topic. That way all of your information will be readily at hand in one location. Down the road, the only way to find this Tear Down article (for example) will be to use the Search feature ... which is not too specific with it's return information.

Shane Balkowitsch's Complete Restoration of BMW R75/5 into Cafe Racer project is a good example.

Hi Lew,

Oh, indeed. That makes excellent sense. Thanks for that suggestion.

Best
Brook.
 
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