Willow Springs Vintage Races 2013

A day at the races. April 27th, 2013

Learning the rules of the track:
InstragramRaceRules

First race:
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A friend and fellow BMW /5 rider Jerome Brown on a Honda:
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Stacy from the East Side Moto Babes club:
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The BMW race representation:
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Side Car Races. I wish i got up on the hill to get some photos of them leaning out the sidecars on the turns. Their heads were about 4 inches from the pavement leaning out the side of the sidecar. Crazy. And afterwards I saw that many of the sidecar passengers were women. Rock on ladies!
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Anatomy of a BMW sidecar:
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I couldn’t agree more:
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The people watching was as good as the race watching:

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My buddy hanging out at turn #4:
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This vintage piece of art was only $250,000:
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Swap meet and display bikes:
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I’m a sucker for beautiful blue bikes:
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This guy has his German priorities straight:
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Nice details on this bike:
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Finish Line:
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BMW Black Gold – Update

Well, the bike runs thanks to the help of a local BMW genius.
But it wasn’t without a bunch more setbacks.
After an hour or so of scratching our heads, we found out that the starter relay was bad. I had a real old ratty one to replace it with and despite all the rust, it worked.
The rear set bracket I made was pinching a bit and made shifting really tight. We had to make a new shift rod. We actually made one out of a R65 pushrod.
The front forks were really stiff which ended up being due to the high weight fork oil. I drained and checked for stiction, then added lighter oil and all is well.

I took it for a break-in ride and it rides and sounds amazing.
After the break in though, the idle was not setting properly. The old /5 carbs were nasty and saw a bit too much action in their day… and i think despite the rebuild, there is nothing you can do with worn parts.
I’ll be replacing the carbs soon so fingers crossed she’ll run a bit smoother. I hope to have it dialed in this weekend.

I still have some finishing touches to do as well. Almost to the finish line. Almost.

Here’s $60 of BMW’s texas tea:
Oil

Crankcase breather

I had to put on my plumbing hat for this job.

I started by building a bracket to hold a breather filter above the transmission.

bracket

I then scoured my garage for all sorts of tubes, hose, fittings etc…
I was able to piece together a connection that ran from the crankcase breather outlet to the filter.
initialplumbing

Unfortunately, the angle of the crankcase breather outlet aims outwards towards the right side of the engine. I test fitted the custom starter cover before I added all the hoses but once the hoses were added, the starter cover wouldn’t fit. I tried shaving down the edge of the hose but it wasn’t going to work due to the angle of the breather. If I forced everything together, after time, the vibration of the the parts would have damaged the fiberglass starter cover.

Luckily, there is a later model breather that has the exact same footprint but the outlet aims upward. Uprightbreather

Then it was just a matter of connecting new hoses.
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I cut down a new BMW crankcase breather hose meant for this style breather.
I also made a trip to my local hardware store and found a brass elbow fitting to connect with the filter.

plumbing

I had a small tray fabricated out of aluminum. I placed it under the filter and connected it to the top of the transmission using the original air filter retaining bracket’s bolt hole.

I don’t anticipate any oil coming from the crankcase breather for many many many miles to come. But should the engine start to weep oil from the breather, it will get caught in the trough and not leak onto the transmission.
newPipes

It isn’t the prettiest plumbing job but it will work and luckily it will get covered up by the starter cover.

Exhaust hanger brackets made

Fingers crossed this exhaust works. It is from a 1930’s R12 BMW. I had a larger inlet welded to mate with the R75 headers. I hope they do not restrict power in any way or make the tuning of the engine difficult.
The headers and mufflers connect OK and luckily the brackets on the mufflers line up pretty close to the exhaust hanger area on the R75/5 frame.
To connect the muffler to the frame, I had to make some custom brackets to attach the muffler.
I made a test set out of aluminum and everything worked out OK. My holes were slightly off but I corrected for that later.

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Here is the test fit.
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I took my brackets and a pocket full of cash to a local welding and machine shop. He replicated my brackets with stainless steal and put the holes in the correct place as per my instructions.
Stainless steel should withstand the heat, elements and keep its shape. I worried that the aluminum brackets I made would not do any of the above.

stainless

Here is the bracket attached to the frame:
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There isn’t much room to work with in there but with the right nuts and bolts, everything went to together just fine. HangerDone

One step closer to starting this baby up!

Gascap cork replacement

Unfortunately, BMW only sells new chrome /5 style gascaps with the lock mechanism. I really like the smaller look of the non locking gascaps. I sourced a very good condition aluminum gas cap and unfortunately, the cork gasket is worn.

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Luckily, BMW does sell replacement gaskets. I happened to have one in my parts stash, brand new. What I needed to order was a new retaining pin and washer from BMW.
Removing the old one was difficult. I started by shaving the old pin head down with a dremel. By doing so, i was able to remove the old cork gasket and create a flat surface to align a drill bit to drill out the old pin.
disassembleCap

I then took the gas cap to my drill press and tried to center my drill-bit as best I could to drill out the old pin. Unfortunately, the drill bit took on the path of least resistance and did not center perfectly to drill out the old pin. And, the old pin’s metal was either extremely hard, or it got hardened from all the heat of the drill bits.
It was one of those jobs that took an hour longer then I had anticipated.
I eventually got it drilled out. Here it is with the new gasket, pin and washer:drilledout2

I used some JB weld in the old pin hole to fill the area where my drill bit went awry. I then drove in the new pin by tapping it down with a hammer.
She’s now ready for fuel.
Gascaplr