Puller spindles and lubricants

All Matra tools with spindles such as M355, M499 / 1/2, M422a, M501 and M282 work much better (more smoothly) if a small amount of lubricant (eg Molykote G-n Metal Assembly Paste) is applied to the thread. This prevents galling of the thread under heavy load and reduces, to a certain extent, unwanted rotation of the other part of the tool.

Rim width

The width of rims can be measured in 2 different ways: the inside or the outside. This means that one and the same rim can be indicated both in (for example) 2.15 “and 3.00”    

BMW posters

These posters are only shown for information. We do not sell these posters. We welcome BMW posters from the pre-69 era.  Mail us at  info@salisparts.com    

Mono and Twin throttle assemblies

The R50 – R69S dual cable throttle assembly cannot be simply converted to a R26, R27 single cable throttle assembly by replacing the cam & chain and the cover. The depth of the recess in single cable cam and dual cable cams differs. The mono cam will not sit deep enough to engage with the throttle twist grip.

Leaking carburetor screw caps

When the screw caps on the underside of the carburetor keep leaking (after having installed new gasket rings), then the probable cause is the condition of the seat of the carburetor gasket. If you look closely, you will probably notice that the surface is rough, damaged or scratched. The solution is NOT to further tighten the screw cap: the gasket ring is not flexible enough to fill these small damages. The seats of the gasket rings can be machined, but if the damages are not too deep they can be removed by sanding the seat with a very fine grit
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Crankcase surface repair

By Michel Loos, The Netherlands The photos are self-explanatory. Steps:  filing  – sanding – pneumatic hammer – aluminum oxide blasting (Edelkorund) – glass bead blasting  

Replacement for Matra 513 tool – rear swing arm pivot pins

The rear suspension pivot pins of the R26, R27 and R50 – R69S models can be adjusted with the use of the Matra 513 tool. However, no replicas are made of the Matra 513 tool. The alternative is a pin wrench such as PN 31421234399.W (Pin wrench for front fork cap screw R69US, R50/5 – R100) Although the diameter of the pins is just under 4 mm and the holes in the pivot pins are 5 mm, this tool functions well. The alternative is pin wrench 31422000243.W (Pin wrench for front fork cap screw R25/3): the pins have a diameter of just
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BING jets

BING jets are stamped with numbers, such as 35, 40 (idle jets) and 110, 115, 120 etc (main jets). One would expect that these numbers refer to the diameter of the jet bore, however this is not the case. This is confimed by the company BING in Germany. A few examples of main jets measured with a wire / jet gauge: BING 44-051 main jet 130 = gauge 120 (= 1.2 mm) main jet 125 = gauge 110 (= 1.1 mm) main jet 120 = gauge 105 (= 1.05 mm) main jet 110 = gauge 95 (=0.95 mm)            
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Matra 282 tool

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

Motorcycle Service and Restorations Manuals

We offer the restorations manuals from Barrington Motor Works for following models (click the link): R26 – R27 R51/3 – R68  R50 – R69S   A copy of the original BMW Repair Manual R50, R60 and R69S can be downloaded or purchased here: Download Purchase            

Brake levers with finger grooves

The brake levers with finger grooves (PN32722072252) currently available in the market, do not fit in the throttle housing of the R26, R27, R50 – R69S models. The hole for the lever screw is of few thenth of a millimeter off it’s original position: the lever gets blocked and cannot be “opened”. New brake levers that do not have this problem are only expected to become available by the end of 2017. Till then, the solution is to mill off +- 0.3 mm from the edges on both sides. After polishing, no traces of milling are visible anymore. This is what
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Exhaust pipes

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    some of 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, as
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Transmission upgrade/rebuild to “S” gearbox ratios

This modification and upgrade, using BMW components, results in a lower-ratio gearing for R26, R27, R50 and R60 gearboxes producing smoother, robust and responsive performance especially in 1st, 2nd and 3rd gear changes while 4th gear is unchanged. The “S” gear ratios allow the rider to accelerate smoothly through gear changes by letting the motor rev freely through an optimum power-torque range.

Carburetor overhaul

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 overhaul 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 7.9 mm – cut M8 x 0.75 mm screw thread – install the idle mix screw with
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Installation voltage regulator (Kleiber)

electronic-voltage-regulator-bmw-r24-r26-eng electronic-valtage-regulator-bmw-r51-3-r69s-eng electronic-voltage-regulator-bmw-r27-r50-eng

Installation of piston rings (KS)

By MS Motor Service (Kolbenschmidt) Click here to open as PDF: KS Installation of piston rings

Websites

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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Batteries

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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Bearing prefix & suffix codes

Some of the prefixes and suffixes found on bearings in the webshop: Prefixes: NJ = these bearings have two integral flanges on the outer ring and one on the inner ring. These bearings are used to locate the shaft axially in one direction. They can accommodate axial displacement of the shaft relative to the housing in one direction only. Example: NJ204 bearing on the rear side of the gearbox input shaft (R51/2 – R68) Suffixes: ECP = bearing with polyamide plastic cage M = brass cage MA = brass cage, outer ring centred C2 = bearing with internal clearance smaller than normal
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Fuel tank repair

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.  

Wiring diagram R26

Wiring diagram BMW R26 (1955 – 1959)    

Motorcycle models

Overview of  BMW motorcycle models produced from 1948 to 1969 (specials not included) Click for larger image: Models & Production Numbers  

Fuel cocks

Overview of fuel cock types for 1 and 2-cylinders

ISO Metric screw thread

Overview of ISO metric screw threads M3 – M30. Commonly used screw threads on 1948 – 1969 BMW models are M6x1 coarse, M8x1.25 coarse and M8x1.0 fine.   The length of bolts and screws is measured like this:                

Carburetors

Overview of carburetor nr’s and settings  

Reading spark plug faces (Bosch)

A visual inspection of the spark plugs can serve as a good indicator of the condition and tuning of the engine. This Bosch sheet may help to identify the possible cause in case of trouble. (click to enlarge)

Spark plug tech tips (Bosch)

Guidelines for correct installation of (Bosch) spark plugs  

R26, R50, R60, R69 – valve guides

No. 12/59 (166) November 19th, 1959

R26 – gasket on rear wheel drive

No. 2/56 (94) May 11th, 1956

R25/3, R26, R27 Drive shafts

No. 1/62 (183) February 1st, 1962