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2015 February 2
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by Dirty Fingernails

Just an update… I have 3 bikes in the works but they have been taking longer then expected.  I’m trying to customize many features vs buying the available parts out there.
And, I’ve been busy over at Oshmo.com helping to develop some Airhead aftermarket parts that look good, and function, for customizing these old BMW’s.

Recent additions are rear sets, and top clamps…  more ideas to come!!

Black Rear Sets for 1970's BMW motorcycles

Black Rear Sets for 1970′s BMW motorcycles

 

 

Airhead Oil Change warning and other ‘used motorcycle’ purchase issues

2014 August 4
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by Dirty Fingernails

“Ran When Parked”

“Just needs gas and a tune up”

Ahhh… the phrases I am seeing in the ads when people are selling a complete hunk of crap.   I bought the last restoration candidate knowing I was going to do a full rebuild but the owner’s ad and conversations were trying to sell me on the fact that the bike could run with an afternoon’s worth of work.
WRONG.  I found all sorts of surprises when rebuilding that engine (and elsewhere throughout the bike).
The bike was an R75/5.

One issue was a deep in the engine when taking out the cam shaft.  The lobes were severely pitted rendering the cam useless.  The bike still would run but doing a complete rebuild was necessary to make this bike ‘right’.  I have a stash of spare parts and happened to have an extra cam shaft lying around. Here are some photos of the bad cam.  If you ever get this deep into the engine block (or at least have the cylinders off), take a look at the cam lobes.  If they are pitted, the lifters probably need replacing too.

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Here is a simple oil filter change fault. 
If you don’t know the history of the bike, it is good to do a complete fluid change as soon as possible. When replacing the oil filter, make sure that the entire old oil filter comes out.
In this case, the gasket and end of an old oil filter were jammed into the rear of the oil filter galley. I’m assuming that an old filter got removed, those parts were left inside, and new filters were installed on top of them, thus jamming them in there even further.  It took me nearly 20 minutes to devise chopstick like tools, with hooks on the end, strong enough to pull this stuff out.

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Just another reason that the used motorcycle market is overpriced on 30-40 year old machines.  Unless you know the bike has ZERO issues like this deep down inside, the cost of repairing these motorcycles is much too high compared to the asking prices these days ($4000 for an old Honda? why?).

In addition to the engine needing a rebuild, the steering bearings were rusted (which is dangerous), the splines and driving dog were almost gone on the final drive and rear wheel, and LOTS of other repairs were necessary.  Again, I planned on doing all the repairs anyway but beware of the “Just needs a battery and a tune up” ads.

Ed Korn Cycle Works Swingarm seal removal tool

2014 June 28
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Removing these seals is a frustrating process.  Prying them out usually doesn’t get you anywhere.

I bought Ed Korn’s tool a while back and it can be used for pulling both the races, and the seals.

Here is how you use it to pull the seals.

Here is the tool assembled

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I first cut out some of the seal’s rubber with a razor blade.
It was easier to get the tool installed that way.

 

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Then you tighten the threaded rod with the allen fitting at the end of it.  By doing so, it expands the nut against the screws and presses them outward so they ‘catch’ under the metal part of the seal.

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Then you install the collar, plate and washer and nut.

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Once you begin tightening that nut, it will pull the seal out into the collar.
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You can then loosen the nut, and break the old seal free with a few taps with a hammer.


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Serge Gainsbourg and Jane Birkin rode BMWs

2014 May 2
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by Dirty Fingernails

 

 

I love this photo. Nice pair of /5 BMW’s too.

Screen Shot 2014-05-02 at 12.13.49 PM

ID plate

2014 April 11
by Dirty Fingernails

Time to stamp some new numbers on the R75/5 ID plate. The old one was just too nasty…

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Riveted to the frame.
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That Damn Steering Lock!

2014 April 10
by Dirty Fingernails

It is hard to explain the time it takes to build one of these bikes.
I totally forgot that the new BMW steering lock kit needs modifications. It was one of those jobs that should take 5 minutes and instead took over 45 minutes.
I first installed the lock and realized it wasn’t activating properly.
And then scratched my head and I remembered that I have to modify it as seen in this post:
http://beemersandbits.com/2012/07/steering-lock-install/
So here it goes.
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And then it came time to add the cover and quickly realized that it needs modifications as well.
Here is the front side of a new cover, and an old one I had cad plated:
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Here is the rear:
IMG_4192It takes a care amount of time to rout out the rear of the plate for the notch on the frame that guides the cover as you open and close it. It isn’t a perfect work of art but luckily nobody will ever see the rear of this cover.
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Powder Coating is back!

2014 April 7
by Dirty Fingernails

It is like being a kid on Christmas morning again! I love ripping the wrapping paper off these parts.

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