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Old 12-23-2009, 07:45 AM   #1
sparkymoto OP
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PROJECT: 76 R75/6 Cafe

I picked up a 1976 R75/6 with a mere 100,000 miles on the ticker at the ‘09 Mid-Ohio Vintage Days. Anyone who’s been to this wonderful event knows that it’s easy to be tempted to bring home a vintage machine or two!




I was hoping to find another airhead cafe project that had a little more oomph than my ‘73 R50/5.



Seeing that this /6 had been spruced up here and there, it was better than a good start.The previous owner did a nice job making a cafe of his own...but I had different plans. A deal was struck and ideas were already piling up.



After following some great build logs here on ADV and using them as a great source of info, i was inspired to share this story. Gotta give thanks to MIOB, bpeckm and Shmerel for posting their in-depth airhead projects that have been very helpful to me so far.

MIOB’s R80:
http://www.advrider.com/forums/showthread.php?t=439120

bpeckm’s 60/6 cafe:
http://www.advrider.com/forums/showthread.php?t=363638

Shmeril’s caffienated airhead:
http://www.advrider.com/forums/showthread.php?t=367419

And now of course I'll be following rkatapt's thread!

more soon...
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'76 BMW R75/6 Cafe Racer < build thread
'87 KLR 650, '70 Suzuki Titan, '10 Ural Red October, '00 Ural Patrol
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sparkymoto screwed with this post 12-30-2009 at 12:05 PM
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Old 12-23-2009, 08:34 AM   #2
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I started googling, forum searching and ebay surfing for more info and parts resources. i had to be realistic with my somewhat limited mechanical skills; some of the mods will require a metalworker/fabricator. Most of the build will be put together on a skimpy budget with extry elbow grease and lotsa creativity. One of the first search results led me to this YouTube vid:

http://www.youtube.com/watch?v=cpXpizXAWCU


It has a great stance and simplicity about it. I bought a similar (maybe the same) set of Dunstall style mufflers as the bike in the vid above for $60.00 on ebay. I tried a set of clubmans in place of the euro low bars but still wanted to lower the profile up front. Clip ons should do the trick, back to the internet to search. Prices were all over the place for these, but I found a set for what seemed to be nice quality for the buck. Search eBay for: CLIP ONS 35MM DUNSTALL” or find the seller, “250champ” ($75.00 set)

For a more expensive option, a guy could use these: http://www.woodcraft-cfm.com/Scripts...dproduct=17773



I removed the stock headlight ears 'n' tubes and got a $13.00 set-o-brackets on ebay. They’re mounted as low as possible.

Here's the bike with clip ons, new headlight brackets, no gauges and shorty mufflers.

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Old 12-23-2009, 08:45 AM   #3
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That thing is sweet. Nice job. ADV board is also a great resource for me as well- so much talent here, and so amazing at everyones' willingness to share their knowledge.
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Old 12-23-2009, 08:47 AM   #4
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That is looking really, really nice.
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Old 12-23-2009, 09:09 AM   #5
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Really nice....

What is your rear tire size it looks a bit wider than the one on my R90/6.
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Old 12-23-2009, 09:26 AM   #6
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Quote:
Originally Posted by rkatapt
Really nice....

What is your rear tire size it looks a bit wider than the one on my R90/6.
Thanks guys!

rkatapt: the tire is a 120/90 (4.00) Conti Tour. it baaaarrrely fits. Plans for tire replacement will be the Michelin Macadam 110/90 for rear (if they're still out there) and a Macadam 100/90 for the front.
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'76 BMW R75/6 Cafe Racer < build thread
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Old 12-23-2009, 09:27 AM   #7
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The inhereted tail section is nice. It’s a classy item with a great application of padding, upholstery, paint and tail light...it’s just not the style I’m going for.

After I removed the subframe, shocks and battery tray, it’s time to hack off the tabs. K&N cone carb filters will replace the need for the airbox and will make room for a monoshock set-up.



Two different shocks found on ebay will give me options: The GSXR 750 looks nice and sturdy. The Triumph Speed Four seems to have a wider range of adjustment. Trial and error...we’ll see how that goes.

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Old 12-23-2009, 09:46 AM   #8
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PM Sent....

rkatapt screwed with this post 12-23-2009 at 12:26 PM
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Old 12-23-2009, 01:49 PM   #9
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Quote:
Originally Posted by rkatapt
PM Sent....
Got it. thanks!...
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Old 12-23-2009, 02:15 PM   #10
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Finally, your own thread!


Looking really nice! I'm going to follow this thread closely.
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Old 12-23-2009, 06:21 PM   #11
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Hey! Thanks for the "credits" and for the update... looks like a good project, good bike, and I like your sense of style and design just based on the avatar!

We'll all be watching.......there is, as you know, a lot of satisfaction in putting together your "own" style in your own bike! Kudos

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Old 12-23-2009, 06:51 PM   #12
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@MIOB
@bpeckm

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'76 BMW R75/6 Cafe Racer < build thread
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Old 12-23-2009, 11:06 PM   #13
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Tailpiece mock-up

Working with Adobe Illustrator, I traced the side profile of the bike and made a simple line art model that allowed dozens of tweaks before confirming the desired proportions and position of the bum stop (also roughed in the plan for the rear swingarm bracing and shock mount).



A friend of mine is an artisan when it comes to shaping aluminum. He will be sculpting the tailpiece, fabbing the subframe area, and welding/bracing up the rear swingarm and shock mount. He’s a very meticulous fabricator. I wanted to try developing my own shape for the tailpiece and he advised using 2” blue foam insulation board as the "buck" or pattern. So, I picked up a 4x8 sheet at Lowe’s and gave it a shot, check out the photos below. Tools used (as recommended): scroll saw, big toothy kitchen knife, 3” drywall screws, wood rasp and foam board glue. Fun!

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Old 12-23-2009, 11:15 PM   #14
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Looks great, but trust me, You're gonna wanna push that whole tail piece thing back at least 4 inches or more so you can actually ride it.
Robert
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Old 12-23-2009, 11:33 PM   #15
MIOB
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Quote:
Originally Posted by wirewrkr
Looks great, but trust me, You're gonna wanna push that whole tail piece thing back at least 4 inches or more so you can actually ride it.
Robert
'

I don't think you have to. My tail ends at about the same length, is about the same size and my tank is even longer and I have no problems at all.

really like the lines by the way!
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