Just after returning from an Okie Airhead Tech Day, the port side carb began weeping fuel from the bowl gasket joint. I then spent a good part of Mothers Day by celebrating the successful replacement of the floats, float needles and bowl gaskets in both of the R100S 40mm Bings. To save you looking up numbers, the floats are BMW part #13.11.1.254.766 and are the same part number as those for the R65's 32 mm Bings.
Fresh out of the box, my vintage gram scale registered 12.50 grams for each new float. Bob "Snowbum" Fleischer states 10 grams new in his tech section. At least the ones I got are consistent. My scale is an old balance beam rig from model aircraft days and may not be as accurate as an electronic unit.
The old floats were heavily discolored and had a chalk-like layer of 'sediment' bonded to the metal portion of the float assembly which did, after drying, add to the 14.00 gram measured weight. Snowbum considers an 18.0 gram float as a total sinker.
The rubber tips on both float needles showed indentations where they contacted the fuel inlet port. Both needles and floats were the cause of the too high fuel level in the float bowls.
Here's the link to Snowbums section on Bing floats: <http://bmwmotorcycletech.info/bing-floats.htm>
