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-   -   Build thread blah blah blah R75/6 "Ernst" (http://www.advrider.com/forums/showthread.php?t=593047)

melville 06-23-2010 05:51 PM

Build thread blah blah blah R75/6 "Ernst"
 
So I asked, and you have spoken. Well, three of you, anyway.

Quote:

Originally Posted by blaine.hale
Dooooo it!

Quote:

Originally Posted by Lornce
Are you kidding?

It's what makes the Old School world go round.

Quote:

Originally Posted by danedg
I haven't had a chance to give a complete stranger bad advice, for a while!....


So for my 40th birthday Mrs. melville got me this:

http://i276.photobucket.com/albums/k...bmwasfound.jpg

She did it because she knew I wanted a bike but was too much of a responsible husband and father to actually go get one myself. She also had me sign a contract stipulating that the bike would be restored/refurbished, I'd take the MSF course(s), and no women on the bike other than her. She likes to have control, and I'm mostly OK with that. Note also that there are no carburetors mounted--they came in a box in a zillion pieces.

Two and a half years later (August of 2009), after two VW motors and a shoulder surgery, I got a carb rebuild kit and put them together and got the bike running so I could evaluate the motor and chassis before I took it all the way apart. Looked like this:

http://i276.photobucket.com/albums/k...gz868/BMW1.jpg

I put about ten miles on it, verified compression, observed leaks (PR tube seals) and then it came apart. Disassembly post to follow.

east high 06-23-2010 05:54 PM

Where behind the Redwood curtain are you exactly? I grew up in Humboldt Co.

jellycow 06-24-2010 12:27 AM

That fairing tops every single other one I ever laid eyes on. It looks like it's been dragged through the forest where the ugly-trees grow, hitting every tree on the way and then going back the same route just to make sure it actually did hit every tree. Glad you took it off.

Nice project, keep us posted.

Padmei 06-24-2010 12:32 AM

But apparently very aerodynamic:rofl

melville 06-24-2010 07:45 AM

east high: I'm in the college town.

jellycow and Padmei: I'm building it up naked (now there's a mental image), but I'm saving the fairing for my old age. My local Airhead guy calls it "That Bullet Train fairing."

The bike starts to come apart:

http://i276.photobucket.com/albums/k...z868/BMW17.jpg

http://i276.photobucket.com/albums/k...z868/BMW20.jpg

http://i276.photobucket.com/albums/k...z868/BMW23.jpg

http://i276.photobucket.com/albums/k...z868/BMW26.jpg

http://i276.photobucket.com/albums/k...z868/BMW27.jpg

http://i276.photobucket.com/albums/k...z868/BMW28.jpg

http://i276.photobucket.com/albums/k...z868/BMW34.jpg

Not quite as fancy as blaine's stop motion video. Next: what was found in disassembly.

Renner 06-24-2010 09:00 AM

Quote:

Originally Posted by melville
east high: I'm in the college town.

The one college in the whole county :lol3

I'm from the north edge of the town just south :thumb
Though my grandfolk used to own property in the town with the big airport to the north.

Good to see some resto action from the heart of the redwood empire here Melville.

CurlyMike 06-24-2010 09:41 AM

bonus points for old VW buses in the mix, specially when used as temporary parts storage. Robert will love that. :freaky

east high 06-24-2010 09:42 AM

Actually there are two colleges in the county; only one university. :P

I'm from the next biggest town south of the town you're from.

Quote:

Originally Posted by Renner
The one college in the whole county :lol3

I'm from the north edge of the town just south :thumb
Though my grandfolk used to own property in the town with the big airport to the north.

Good to see some resto action from the heart of the redwood empire here Melville.


azcycle 06-24-2010 10:50 AM

:lurk

Not familiar with the schools up there so I don't know where you're all located. But I spent all my young summers there visiting my grandfolks. My parents were both born/raised in Loleta and went to Fortuna High. Both grandfathers were in the dairy "industry" there, my dad's dad was Prez of the Foremost dairy in Loleta for many years. Love that area... haven't been back in too many years.

Sorry for the thread derail... carry on...

Lornce 06-24-2010 11:45 AM

Quote:

Originally Posted by melville
http://i276.photobucket.com/albums/k...z868/BMW34.jpg

Not quite as fancy as blaine's stop motion video.

Yeah, but he didn't make his frame levitate.

That's a Hannigan fairing, you philistines.
I feel better now.
:bmwrider

Lornce
in an unnamed college town.

melville 06-24-2010 05:47 PM

OK then, what I found as it came apart:

Kinda crusty, a bit leaky:

http://i276.photobucket.com/albums/k...gz868/BMW6.jpg

If you run barbacks like this:

http://i276.photobucket.com/albums/k...gz868/BMW2.jpg

You'll never remove the tank to take care of this:

http://i276.photobucket.com/albums/k...z868/BMW10.jpg

A little water in the gear oil, but only in the transmission:

http://i276.photobucket.com/albums/k...z868/BMW11.jpg

A little extra wiring, but no evidence that a trailer was used(there are other PO wiring issues):

http://i276.photobucket.com/albums/k...z868/BMW14.jpg

The air filter element is pierced and the breather hose extended outside the element:

http://i276.photobucket.com/albums/k...z868/BMW18.jpg

Two filament bulbs in the turnsignals. Joints are soldered:

http://i276.photobucket.com/albums/k...z868/BMW35.jpg

Found the rumble! New bearings needed all around, wheels, swingarm, head:

http://i276.photobucket.com/albums/k...z868/BMW62.jpg

That's a lot of what I found. Process postings to come, in which I will reveal a wee fetish.

Lornce 06-24-2010 08:24 PM

Quote:

Originally Posted by melville
Process postings to come, in which I will reveal a wee fetish.

You just bought a crusty 35 year old airhead. We're already ahead of you on that one.

:rofl


:thumb

Plaka 06-25-2010 02:58 AM

Quote:

Originally Posted by melville
So I asked, and you have spoken. Well, three of you, anyway.







So for my 40th birthday Mrs. melville got me this:



She did it because she knew I wanted a bike but was too much of a responsible husband and father to actually go get one myself. She also had me sign a contract stipulating that the bike would be restored/refurbished, I'd take the MSF course(s), and no women on the bike other than her. She likes to have control, and I'm mostly OK with that. Note also that there are no carburetors mounted--they came in a box in a zillion pieces.

Two and a half years later (August of 2009), after two VW motors and a shoulder surgery, I got a carb rebuild kit and put them together and got the bike running so I could evaluate the motor and chassis before I took it all the way apart. Looked like this:



I put about ten miles on it, verified compression, observed leaks (PR tube seals) and then it came apart. Disassembly post to follow.

From that bit with the crankcase vent, the PO was an idiot. beware other idiocies. The forks need rebuild. Not costly.The shocks need replaced---that one can be expensive. Examine the inside of the frame around the battery for battery fume rust. Rust under the master cylinder is common. Rebuild it. paint frame. Examine the weldnuts for the muffler hangers closely for stripping or crossed threads. . Replace if they are flaky---easy to do before you paint. Save the fairing, it is valuable---including all bolts and brackets. The oil leakage looks typical, maybe a bit heavy if it's washed the dirt off. You want a push rod seal drift, you will use it again and again to keep the pushrod seals tight. The only other special tools for regular work is an exhast nut wrench and decent swingarm pivot socket. . You can make the tools to do the fork rebuild---a cut up beer can, some big washers, some hose clamps. if you change your fork oil you won't need them again for many, many years. Save all removed bearing races. You will need those again. The head bearings can be tough. Borrow the right tool, buy one from Ed Korn or do the weld-bead procedure. I've done it with a Dremel. A PITA. It's ugly but if you keep your adjustment correct the bearings will last forever. Get a push greaser for the swing arm---the $6 one for chainsaws work great. Also buy or have made a better socket for torquing the swing arm bolts. it's a standard socket tuned down a skinch. Cheap to have done at a machine shop. You will use it many times to set the swing arm preloads. You can make your own clutch removal tools. The clutch is very close to a VW clutch. Some longer bolts, some peices of tubing and some nuts will ease it apart evenly. You can re-assemble by eye without a pilot if you have a good eye. Make sure you have the one-use-only bolts on hand before reassembly---con-rods and the main u-joint at the rear of the tranny. Make sure the length is correct. minimum cost but takes time to get them. Replace all gaskets and rubber. ESPECIALLY the rubber boot on the end of the cable going into the tranny---that one leaks and gets water in the tranny oil. (I think it's the speedo cable) Cut a slot in the ground cable at the tranny to avoid having to remove the bolt to get the ground strap off. Saves stripping it. Examine the hole to see if it has been pre-stripped for you. Check the runout on the cam nose. You can do anything except replace the cam and crank with the engine in the bike--so check that. Don't bother the timing chain unless you know it's bad. Replace the cam chain cover gasket if it leaks too much--other wise leave alone. Easy to do later. Examine oil pump parts. may as well while the clutch is out. Replace what is worn.

Oil pan looks unusual. Replace the pickup gaskets and threadlock the pickup part bolts.

Check the trueness of the wheels after setting the bearing preload and greasing. Fix what needs it.

White rust is a tough one. Beadblasting removes it but once it's there it returns quickly. Some people paint. I tried impregnating the porous castings with wax one time. Put em in a low oven, just hot enough to melt the wax, and did coat after thin coat of Johnsons paste wax. Stunk up the house. Seemed to hold up in the salt air of coastal California. Did a thin surface coat of wax on the castings when washing bike.

melville 06-25-2010 08:45 AM

Quote:

Originally Posted by Lornce
You just bought a crusty 35 year old airhead. We're already ahead of you on that one.

:rofl


:thumb

You don't know the half of the fetish yet!

A little introduction to who I am--I spent my 20s working as a bike mechanic in Seattle. With the ensuing poverty that entailed, we had to become self reliant chez melville as regards vehicle and home repair and took on some fairly outrageous projects. We learned that no matter how much you pay someone, they're never going to care as much as we do about the project.

I try to build my bicycles and VWs to be simple to maintain. We have a few of both, and time spent wrenching, while pleasant, is not as much fun as time spent riding. For the most part, that means I end up with something like this:

http://i276.photobucket.com/albums/k...ron5252008.jpg

This is season 23 on that bike, and I've only replaced wear items (tires, chains, brakes) since 1990. Where I can, I favor Install and Ignore parts.

I do also, however, worship at the altar of the Bright Shiny Object and try to have such things in my life when possible. For bicycles, I could do it with my track bike:

http://i276.photobucket.com/albums/k...threadless.jpg

So my goals here mit the Airhead are to have something I can hop on and ride that's easy to maintain and a bit shiny. I'm going to build it stockish and with some changed details. I'd like it to age gracefully for another 35 years.

And now for a sample of my fetish. The lower triple, as it came from the bike:

http://i276.photobucket.com/albums/k...z868/BMW45.jpg

After a run on the buffer:

http://i276.photobucket.com/albums/k...z868/BMW46.jpg

Looks like dookie. Time to bring out the files and sandpaper:

http://i276.photobucket.com/albums/k...z868/BMW49.jpg

And another pass on the buff:

http://i276.photobucket.com/albums/k...z868/BMW50.jpg

And now ready for prime time:

http://i276.photobucket.com/albums/k...z868/BMW51.jpg

Seems there are a lot of AL parts on the bike. I was (still am) busy making them nice. More to follow.

Lornce 06-25-2010 09:51 AM

Cast aluminum surfaces on the trans and engine respond fairly well to generous coats of aerosol clear coat. Don't worry, you won't get a shiny surface as most of it will be absorbed, but enough coats and you can seal up the casting's pores. Makes it easier to keep the cast surfaces clean and oxidation free. :thumb

That's a shiny triple clamp. Bodes well for what's to come.

:lurk


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