NOS Magura throttle grip for BMW Twin R51, R61, R66, R75 etc,
Click for bigger pictures.


If anyone reading this knows what makes, models and years this throttle was used on, please let me know and I will post it here, Thanks!

Bosch had a tradition of cable operated headlight dip. The switch for this was not out in the weather on the handlebars, but dry and snug inside the headlight, operated by cable from the handlebar thumb lever. Bosch made really good stuff!

Below is a 1920s Bosch ad showing a "Heringdose" (Herring can) headlight with an earlier cable-operated switch, illustrating this tradition.

Weatherproof horn button too. Even if Bosch was crazy good at making high quality parts, maybe they couldn't figure out how to make a cable operated horn! But this is still better than most.


Note: I actually have one of these Heringdose headlights, that I am going to prepare, photograph and post on these pages.
Also one of these horns, and a few D-Zünder combined magneto/generators as in the ad. I will prepare, photo and post as I find time.
Many/most? European Indian importers in the 1920s-30s got the bikes from the factory without electrical equipment and fitted Bosch parts.
Wiklunds, the Swedish importer, even got their Indians in green! So don't always trust the glossy picture books; lots of strange things happened.

Oh, and today's graphical artists; I know you can't go back, but look at this ad and compare it to what is made today...


Two holes for throttle cables to two carbs.
Oh, and a hole for the headlight dipper switch cable, too.


A bit dirty from many years storage, but look at the screws - no tool has touched them since they left the factory!

Bosch - who made the electrical parts on this throttle grip - (and his workshop foreman/resident electro-mechanical genius Gottlob Honold) pioneered the high-tension magneto in about 1905, more or less single-handedly saving motorcycling as a practical means for getting around.

Before the HT mag, there was the low-tension mag, with points inside the combustion chamber, hot-tube ignition and other contraptions. If you wanted simple points to drive your spark plug (another Bosch invention, I think), you had to carry a heavy glass-cased accumulator (battery) and have it charged at the radio store (few private homes had electricity then) every Saturday, and try not to run it dry during the week. The HT mag put an end to all that. Without it I don't think motorcycles would have survived until 1920.

To this day - on anything from refrigerators to engine management systems - the Bosch logo, as seen on the switch cover above, is a magneto armature. How cool is that?
(also see logo in the bottom right-hand corner of the 1920s ad above)


How many other throttle grips had a grease nipple?