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We mill 2 planes on the threaded bushing so that it is possible to use a 22 mm wrench on the threaded bushing. This is necessary in cases where (for instance) the crankshaft bearing is glued to the bearing journal, to prevent the threaded bushing from rotating while tightening the central bolt

3 different breather plates have been used on the boxer engines:

Different exhaust pipes are available in the market, unfortunately not always an exact replica of the original pipes: the shape of the bends does not correspond with the original BMW exhaust pipes as can be seen on this picture. The 2 lower exhaust pipes are identical to the original pipes.   Next to that, these pipes follow a slightly different path than the original exhaust pipes. This causes a problem for the R67 – R67/3 models: in the horizontal section, they’re not running close enough to the frame, causing too little clearance between the brake pedal and the right-hand exhaust pipe,
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Overview of the different inserts used in Bing carburetors

Overview of the different crankshaft shims used in the boxer engines

With hardly any new carburetors being produced by BING for the < 1969 BMW mono and twin motorcycles, it’s getting increasingly important to be able to repair and recondition the used original carburetors. Luckily, special parts and tools are available nowadays to restore the carburetors to a good working condition. A. Idle mix screw: very often, the M7 x 0.75 mm screw thread in the carburetor housing is worn out. There are 2 good solutions to this problem. 1. drill the threaded hole to 7.2 mm – cut M8 x 0.75 mm screw thread – install the idle mix screw with
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Part nr: 33120026232 Next to the original BMW driving dog, an after-market version is available in the market. At first view, the after-market product gives the impression of high quality machining. However, there are at least 2 flaws: 1. the geometry of the splines:the splines of the after-market part almost have a V shape instead of the trapezium shape on the original part. This V-shape is normally seen on worn splines 2. The diameter of the needle bearing seat measures 39.94 mm whereas the original parts measures 39.97 mm. This will result in too much play on the needle bearing The
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By MS Motor Service (Kolbenschmidt) Click here to open as PDF: KS Installation of piston rings

Fair calender Oldtimer & Youngtimer: https://www.messen.de/de/1278/branche/oldtimer-und-youngtimer (mainly Germany) BMW forum: http://2-ventiler.de/  (Deutsch) http://www.flat-twin-bmw.com/  (French)   BMW clubs Germany: http://bmw-einzylinder.de/   BMW clubs United States: http://vintagebmw.org/v7/ http://www.bmwmoa.org/ http://5united.org/   BMW clubs United Kingdom: http://www.thebmwclubs.org.uk/ http://www.theairhead.co.uk/   BMW clubs The Netherlands: http://www.bmwclubnederland.nl/ http://www.bmwcluboirschot.nl/ https://bmwmcnnl.nl/ https://www.bmwboxerclub.nl/v2/   BMW clubs Denmark: http://www.bmw-veteran.dk/   BMW clubs Indonesia: http://bmwclubjakarta.blogspot.nl/   Facebook: https://www.facebook.com/Bmwclassicmotorcycles/ (that’s us) https://www.facebook.com/groups/bmwold/   (Vintage & Classic BMW Motorcycles USA) https://www.facebook.com/groups/AirheadsAustralia/ https://www.facebook.com/profile.php?id=100001965546450  (Richard Sheckler) https://www.facebook.com/scottiesworkshop/ (Scottie Sharpe)   Information sites: http://w6rec.com/general-bmw-motorcycle-information/ http://bmwdean.com/ http://vintagebmw.org/v7/ http://www.beemergarage.com/ http://www.bmbikes.co.uk/information.htm https://bmwr12.net/ http://www.wildstar-fan.de/BMW/home.html (R25/2 restoration- Deutsch) http://labeheme.jimdo.com/ (/5 info – French) http://www.ibmwr.org/otech/chassis.html  (Survey of Chassis Numbers) http://weissundblau.blogspot.nl/2011_05_01_archive.html (after-market hubs) http://www.earlesfork.com/ http://www.trixondrums.de/glaeser/glaeser.htm (Gläser fairing – Deutsch) https://www.shannons.com.au/club/bike-news/old-bike-australasia-1937-bmw-r5-ss/ 
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Source: Wikipedia https://www.batterystuff.com/kb/ The Lead Acid battery is made up of plates, lead, and lead oxide (various other elements are used to change density, hardness, porosity, etc.) with a 35% sulfuric acid and 65% water solution. This solution is called electrolyte, which causes a chemical reaction that produce electrons. When you test a battery with a hydrometer, you are measuring the amount of sulfuric acid in the electrolyte. If your reading is low, that means the chemistry that makes electrons is lacking. So where did the sulfur go? It is resting on the battery plates and when you recharge the
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By Richard Sheckler, Wayne, Ohio. Spot welding of panels inside the tank for strength and to plug the rust holes. The tunnel is removed to get inside. The last step before reinstalling the tunnel is to weld the knee pad brackets in place. When the tunnel is TIG welded in place, the inside is sealed with fuel resistant epoxy.  

By Richard Sheckler –  Wayne, Ohio. Crank case repair. I was for the most part unemployed for about two years in the mid-1990’s. I had an ‘under the table’ job working on motorcycles for a friend and fellow collector. One time after some persuasive negotiating, I received payment in trade. That was a partial basket case 1953 BMW R68. The bike had matching serial numbers, to whom, if you are a collector, is regarded as significant. Karl B. a long time M/C race enthusiast and rider acquired the R68 from a family near White lake, Michigan. The bike had been
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