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JDHMike
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VBMWMO #9068
Joined: 02/02/2016
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Looking for opinions, (dangerous I know), and comments regarding this recently acquired bike. I am new to the VBMWMO and this bike is new to me. Reading this forum makes me a little nervous as to what is real and what is not. Do not hold back, your thoughts and critique will be greatly appreciated. Is this bike what it is represented to be. A correctly restored R42.

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Bruce Frey
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Texas Hill Country, USA
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It looks like a really nice

It looks like a really nice bike! To me, the upper and lower transmission stamps look correct as well as the frame and engine stamps.

The lower lower engine half should have a number and it looks like it has been ground off, so I think the upper and lower are probably from different bikes. I doubt the badge is original, so I would check with BMW archives to see if the engine and frame belong together.

I not too familiar with R42 and can't tell from the pix how many of the other parts may be from the large number of available reproductions, but the heart, lungs and bones appear to be the real R42. It would look good in my garage;-)

Bruce

JDHMike
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Your Reply

Thanks. I appreciate the input.

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Darryl.Richman
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That's a beautiful bike! I

That's a beautiful bike! I agree with Bruce about the frame badge.

Of the hardware I can see, it all looks like the right items for the period. However, a number of the shiny parts look like they are chromed; almost nothing in this era was chromed, but rather nickel plated. This is hard to tell from the photos, it looks like the heads have been adapted to take modern, 14mm spark plugs, rather than the original 18mm plugs. Does the headlight have a key to turn it on and off? It's also hard to tell from the photos, but I would guess that it and the taillight are reproductions - you can tell if the insides are made from modern materials.

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JDHMike
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1927 R42

Thanks for the reply Darryl. My friend Doug Jones put me in touch with Eric Bahl who suggested I join the VBMWMO and possibly give you a call. My wife bought this bike at the recent auctions as she thought it looked cool, I don't disagree and in fact quite like the bike. In the past with my other bikes I enjoy going to the AMCA meets and having the bikes judged. I am hoping that this bike is a candidate for judging, although I think your comments re plating and the tail and head light are probably correct. I have not fired this bike up yet but plan to do so shortly. Is there anything I should be aware of or any particular procedure that I should adhere to?

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Bruce Frey
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You are a very lucky man to

You are a very lucky man to have a wife who buys cool motorcycles!

Bruce

Darryl.Richman
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I second Bruce's comment!

I second Bruce's comment!

Before actually riding it, I would verify that everything is snugly tightened, and in particular, the two bolts that clamp the spring leaves to the steering head. I would also verify that the front axle is set up and bolted correctly so that it doesn't have too much preload on the wheel bearings, and that the trailing link ends are captured properly.

For myself, before running it - because I see from the header pipes that it hasn't been run - I would remove the heads and cylinders and put some oil in the sump, then spin the crank at least 100 times by hand to verify that oil is getting to the conrod big ends.It will also allow you to find out whether you have a one piece crank with Babbit metal plain bearings in the conrods or a built up crank with rollers. Anyway, whenever I assemble my R52 engine, I do this to make sure that the oil pump is working and oil is going where I want it.

Every one of the bikes from the 20s that I've seen fired up have different starting rituals, that seem to depend on how the carb and mag are set up. On my R52, from cold:

  • Open the fuel tap
  • Hold the carb tickler down until the carb drips
  • Retard the spark nearly the entire way
  • Open the gas lever about 1/3 (upper lever on right) and the air lever about 1/2 (lower lever on right)
  • Kick it to life
  • Adjust the spark to about 1/2 retard, the gas 1/8 and the air full, while warming up

My R52 is a very eager starter, and it almost never needs a second kick. But I have seen others that need a different ritual entirely, and also bikes that were reluctant starters.

The transmission bottom case is supposed to be filled with grease, and the case was never intended to be oil tight. There's still a grease available that seems to be the right thing to use here:
Mobilux EP 023
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENGRSMOMobilux_EP.aspx

"Mobilux EP 004 and Mobilux EP 023 are particularly suitable for the lubrication of enclosed gears and bearings in poorly sealed gear cases on most underground mining machinery with the exception of electric motor gearings. Mobilux EP 004 and Mobilux EP 023 can also be used in many other industrial applications where conventional gear oils cannot be retained in equipment such as gear cases, chain cases, because of leakage due to worn or missing seals. Mobilux EP 004 passes the SEW 1008 hour gear test requirement DR.EM.203 mod."

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JDHMike
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1927 R 42

The bike registers 2k on the clock. It is reported the bike runs well, yet still needs to be broke in. I appreciate your guidance and will proceed accordingly. Thanks

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JDHMike
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Shop Service/Parts Manual

Is it possible to find a good shop service and or parts manual for this bike? Where would one look for things like the correct head light or tire pump?

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Darryl.Richman
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So far as I know, there's no

So far as I know, there's no shop manual. You can buy reproductions of the original parts book and the owner's manual, which has a fairly detailed walk through every system on the bike... in German. These books are generally available at the swap meets... in Germany... for about 20 euros each.

You'll soon build up a network of suppliers who can provide things like the headlight and foot pump. Have a look at Oldtimer Garage, Dreher Oldtimerteile, Wolfgang Reichenberger, Uli's Motorradladen and probably some others.

I bought a repop headlight from Oldtimer Garage in Poland. The outside looks pretty good, but the actual electric bits inside are junk, though easily replaced. The little key that turns the lights on and off makes no attempt at imitating the original. Another problem is that the arms are formed for use on an R32, so they have to be bent to match the R42 mounting. And they have no stops to locate them in the forks, and no threads to tighten up. http://www.oldtimergarage.eu/catalog/product_info.php?cPath=21_44_109&pr...

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Bruce Frey
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Texas Hill Country, USA
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You should be able to get the

You should be able to get the Ersatzteilliste and Owners Manual from Mark Huggett at bmwbike.com.

Part of the fun of old BMW is learning a bit of technical German.

Bruce

Darryl.Richman
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Another part of the fun

Bruce Frey wrote:

You should be able to get the Ersatzteilliste and Owners Manual from Mark Huggett at bmwbike.com.

Part of the fun of old BMW is learning a bit of technical German.

Bruce

Another part of the fun is learning to swear in German, when you work on the bike, or, especially, these reproduction parts.

I didn't realize that Mark carried these prewar manuals! I'll have to get a few more. I find them interesting, even if I don't have the bike they describe.

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JDHMike
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Keeping the Wheels Turning

Thanks guys, appreciate the comments and leads. As with everything new it would appear I have a lot to learn which I am looking forward to as at this point I really like this bike/project.

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JDHMike
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BMW Archives

I have sent 2 emails complete with pictures to these folks requesting info regarding this bike. As of yet have not received a reply. Any guidance or suggestions?

Thanks

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Hans
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manuals R42

Years ago I restored and later sold a r42. I still have both repro manual and part list for r42. It is easy for me to scan theses and provide them as a pdf file. If it would help it could do this for you. Just let me know.

Darryl.Richman
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Holiday

It's Karneval this week in Germany. They probably won't sober up until the middle of next week.

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JDHMike
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r42 PDF

Hans, That would be greatly appreciated. My email is podgerspei@gmail.com

Thanks

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