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The Plunger
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Joined: 09/03/2012
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Hey all,
Things are progressing rapidly now and I reached a significant point in the rebuild today by getting the motor, gearbox and final drive installed! I'm learning a lot with this build which will make my R51/3 much easier next year. I have nearly the rest of this year off while I recover from a hip replacement, which really helps on getting projects done. I hope to have it running by Halloween and on the road by Thanksgiving.

Brian

  • r67_2.jpg
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Brian
'52 R67/2

stagewex
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Looks really nice.

Looks really nice.

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mike wex/stagewex
1969 BMW r60/2, US Model, 1995 BMW K75, 2006 Yamaha TW200, 2007 Ural Patrol

oldtimers.si
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great another BMW R67/2

hi,Brian
nice , what year is your bike ?

here is my link
BMW R67/2 1953 foto

now i buy some engine and gearbox new parts

its great winter project Smile

BR ,Mec

The Plunger
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Mec, Thanks, It's a '52.

Mec,

Thanks, It's a '52. You've got some work to do changing out a motor! Mine had all the hard work done, I just had to spend a bunch of money to gather up the missing parts and assemble it.

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Brian
'52 R67/2

The Plunger
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Well, I got her done

Well, I got her done yesterday and tried to start her...nothing but a few pops and wheezes. Fiddled with mixture, idle, cables and floats. Still nothing. Checked spark for the third time, checked static timing, point gap and valves for the third time. I walked away after 4 hours furious and frustrated. The next morning I started over with a clean slate and put fresh 91 octane and changed plugs, changed the points and replaced the coil and eventually and got it to fire up and run for about a minute. Sounded good but since I forgot to re-open the petcock she died. Now I got her!, I was beaming. Tickled her carbs and nothing. The language coming from the garage was not for the faint of heart and I'm glad the wife and kids weren't home. I spent the next 6 hours on and off trying to get her going with no luck. Took the carbs off, as I believe this is a fuel issue, and rechecked assembly. They both have all new parts so I can't figure it out. Reinstalled the carbs and...nothing. What am I missing? I've got good, timely spark, air and hopefully fuel. I'm this close to taking a sledge hammer to her and lighting her up!

Seriously PO'd

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Brian
'52 R67/2

808Airhead
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Joined: 08/05/2009
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When it dies,immediately turn

When it dies,immediately turn off the petcock and look in a floatbowl and see how much fuel is in there. Then check the carb settings. These are very sensitive when it comes to carb settings.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

The Plunger
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Thomas, believe me, I've

Thomas, believe me, I've tried 1/2, 1, 1 1/2, 2, 2 1/2 and 3 turns on the mixture screw and none seem to change anything. The floats are working too. For being such simple devices they sure are frustrating. My mixture screws have little screws, or threaded plugs inside and I can't fathom their function.

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Brian
'52 R67/2

Daves79x
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Coil

Did you replace the coil with a new one? Or just another one? I'd suspect that first. Otherwise, if your carbs are set to anywhere near stock settings, turn the idle screws until they touch the slides, then two more turns each, just to give you some idle as a baseline. Then don't tickle them too much - they flood easily. If you find it does not start on the first couple of kicks, hold the throttle wide open as it's likely flooded. Good luck!

Oh, and run a non-waxed piece of cardboard sprayed with contact cleaner through the points.

Dave

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The Plunger
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Dave, I put in a new coil

Dave,
I put in a new coil and new points, just to see if it changed anything. The original coil and points seemed to spark off just fine. It's got to be a fuel issue. It's not flooding as the plugs aren't saturated. As I said, it started and ran fine for about a minute and then ran out of fuel and wouldn't restart. Today I'm going to meditate, take deep, calming breaths and try again. I still don't know if my mixture screw is correct. What is the little screw plug within for? My cut away drawing and parts list of Bing carbs does not show it exists. Is it supposed to be hollow and allow air from the outside in?

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Brian
'52 R67/2

wa1nca
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Ashfield Ma.
Joined: 09/27/2012
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What is the little screw plug within for?

Is it supposed to be hollow and allow air from the outside in?

I think your carbs have been modified with a vacume port
They should be capped off during normal use

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

The Plunger
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Well that makes sense. I’ve

Well that makes sense. I’ve found that isn’t the only thing modified on these, holes have been rebored and tapped to larger size and one of the mixture screws is a stepped affair because the port was bored out and tapped. It looks like a Bing made screw that they may sell for repairs. I paid a lot for these carbs to a seller on eBay out of Germany, I’m regretting that decision.
Also discovered I get spark whether key is depressed or not! That can’t be right.

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Brian
'52 R67/2

stagewex
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I had cleaned my carbs last

I had cleaned my carbs last Spring and for the first time couldn't get them to operate correctly. Tried everything and either it was hard to start or when it would it was running choppy. Finally bit the bullet and brought it to the shop. The mechanic had a hard time as well. When checking to see if the jets might be fouled he noticed his gauge-pin went way too far into the jet. Apparently, while they were the correct jet, they had been bored/drilled by a previous owner and I'm guessing for Winter and cold weather riding?
Why he didn't just get the next oversize I don't know.

My bike has always run strong but now with the correct unmodified jets and after over 3 years of ownership it's like riding another bike completely. Super smooth.

So yeah, if you have some good but used gear there's no telling what the history might be?

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mike wex/stagewex
1969 BMW r60/2, US Model, 1995 BMW K75, 2006 Yamaha TW200, 2007 Ural Patrol

Daves79x
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You Still Need

You still need to do the cardboard thing with new points. But the carbs are another thing. If you did not personally completely disassemble them, verify all passages were clean, jets clean and properly sized, and tap out all threads, it's hard to tell what you have. You have to be sure your mixture screws actually seat and seal when fully closed. Often there are bad threads the last couple of turns and you think the tip is seated, but it's not. These are actually very simple carbs, but you can't overlook anything.

The tiny screw you asked about is just a plug from the drilling of the vent hole in the mixture screw.

Dave

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The Plunger
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They were sold as completely

They(1/24/15-16’s) were sold as completely refurbished and they appeared to be, with all new jets, nuts, screws, caps, gaskets, springs etc., with bright and shiny bodies. Only when I disassembled them did I find the repairs☹️
From this point I’m going to send in my 1/24/25-26 set in to Bing for a new float chamber bottoms and use them as they are otherwise excellent.
Thanks for the tips guys.
Brian

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Brian
'52 R67/2

808Airhead
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I can muggyweld the bowls for

I can muggyweld the bowls for you of that is all they need.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

808Airhead
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These bikes are SO sensitive

These bikes are SO sensitive to carburetion. If your carbs are not perfectly functionAL YOU WILL BE CHASING YOUR TAIL. Show us a pic of your carbs and idle screw/mixture setups. Some idle screws are too short and will not even lift the slide up.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

The Plunger
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Thomas, The idle screws

Thomas,
The idle screws function correctly, I’m thinking it must be the funky mixture screws which I will replace before proceeding. As to the other set of carbs, one has about 1/2 of the float chamber bottom gone so no chance muggy welding that!

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Brian
'52 R67/2

808Airhead
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Yeah,never mind! lol. Can't

Yeah,never mind! lol. Can't 'weld' that,lol.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

The Plunger
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After walking away from this

After walking away from this POS for the weekend my brother suggested spraying starter fluid in to see if it'd run. Well, hell. So I sprayed some into each carb and she fires right up and runs for 3-4 seconds, repeatedly. So the timing is right, the spark is there, I'm just not getting gas. Tore the carbs down for the 4th time, reassembled, nothing. $1300 spent for carbs that don't work(frowny face here).

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Brian
'52 R67/2

The Plunger
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Success! Sort of

I got her running again. I put the carbs back together but used different slides and she fired up with a little coaxing and a boost of ether. Then the problems began anew. I got the left side to run alone and mixed right with a nice idle and she'll thump along just fine. The right side refuses to run sans left cylinder and is actually periodically backfiring through the intake and carb! It spouts a cloud out of the cylinder head and carb intake on startup too. I rechecked the valves and it's all good. The question of the day is, why? I'm no carb expert so anyone have an idea? The mixture screw on that side is the wonky re-bored one and does funny things to idle speed in or out. I'm so close, PLEASE HELP ME!!!!

Brian

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Brian
'52 R67/2

808Airhead
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Take another carb set from

Take another carb set from another bike and bolt them on. Try that first. Carbs either "work" or are "bad". The internals of the carb may be damaged from restoring or wear,for example wear on the bore will not allow sufficient vacuum for correct fuel metering since the vacuum will be low. Try another set of carbs!

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

Danedg
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Make sure your petcock is

Make sure your petcock is working and set correctly... sounds like you're not getting enough fuel.
Got 2 or more gallons in the tank... ?

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'54 R51/3, '65 R60/2, '69 R60/US, '95 Mystic, 74 MG Eldorado

The Plunger
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Fuel flow to the carbs is

Fuel flow to the carbs is fine, I've determined that the wonky mixture screw on #16 is not doing it's job. I can have it all the way in or all the way out with very little difference in performance. The pair I got from Germany (1/24/15-16) looked great until I opened /16 up and found that 6 of the 7 threaded holes re re-tapped and or re-bored and re-tapped! They're going back to Germany. Once my slightly incorrect(per production #'s) 1/24/26 gets back from Bing I think Ill be golden.

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Brian
'52 R67/2

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