What is an airhead BMW?
What is an airhead BMW?
The BMW 247 engine is an air-cooled flat-twin motorcycle engine with two valves per cylinder, also known as the “airhead” boxer. It was used by BMW in its motorcycles from 1969 to 1995. The /5 variant was introduced in 1969, /6 in 1974 and the /7 in 1977. Before 1981 the ignition was points ignition.
How do you adjust a Bing 54 carburetor?
Use the carburetor piston Adjusting Screw to adjust the idle RPM. Turn this screw in a counterclockwise direction until the Carburetor Piston is in the lowest position. Then carefully turn the screw clockwise until it just engages the piston and then continue to turn it clockwise for 2 to 2-1/2 turns.
Where are Bing carburetors made?
Bing is a German carburetor manufacturer now named BING Power Systems GmbH located in Nuremberg. The company was founded in 1866 and has a tradition of 75 years of carburetor development and production.
Are BMW Airheads reliable?
I’d say the airhead engine, or whole bike, is quite reliable. You can rely on it if you do even the most basic maintenance to it. But, people don’t want to maintain. They don’t want to think about oils and valves and seals..
Which BMW airhead is the best?
The R80 is said to the the smoothest airhead.
How does a Bing carburetor work?
The engine presents the carburetor with a vacuum, which draws air (and/or mixture) under the slide. The motion of the air under the slide create a partial vacuum (pressure drop) there, and this is transmitted through passages to the enclosed volume above the piston.
What do Bing carburetor numbers mean?
Carburettor Numbers. Type / Inside diameter / Model number. The first figure which has two to three digits denotes the carburettor type. The inside diameter of the carburettor (the second number) is the smallest air duct diameter.
What is a Bing carburetor?
Bing is a German carburetor manufacturer now named BING Power Systems GmbH located in Nuremberg. The company was founded in 1866 and has a tradition of 75 years of carburetor development and production. In 2001 the company S.U. ( Skinner Union ) Birmingham was taken over by BING Power Systems GmbH.
Why are BMW motorcycles called Airheads?
The history of BMW motorcycles and BMW motorcycle engines starts with the Airheads. Airhead engines are the old-style 2-valve air-cooled boxer engine made before 1992 when the last of them were made. They weren’t called “Airheads” at the time by anyone because they were all BMW made!
Are there any problems with the R75/5 carburetors?
Before working on the R75/5 carburetors to cure what might seem to be carburetor problems, such as with high or irregular idle rpm or inability to properly adjust the carburetors, it is important that the engine valves be set correctly, & the ignition timing be correct.
What rpm should the Bing CV carburetors be set at?
I normally advise setting the Bing CV carburetors for an idle rpm of 1000 +-50 on a fully warmed-up (from a ride) on any Airhead. My advice is to not go below 900 RPM for idle, for better stability (and, timing compartment oiling).
Should I rebuild or restore my Bing carburetors?
Over the Christmas holiday, I restored the Bing carburetors. A restoration is a bit more work than a rebuild since the goal is to restore the finish to factory new condition as well as replace worn parts and all the O-rings and gaskets. Much of the time invested is in cleaning and polishing all the parts.
What kind of carburetor does Bing 64 32 3 have?
These early model Bing 64/32/3 and 64/32/4 carburetors were a bit crude. The idle passageways in the carburetor were a somewhat poorly-designed simple single-stage type, somewhat abrupt in operation as the throttle is barely opened from idle stops.