Crankcase breather.

[ithebruce]

Looking at a youtube clip of someone removing a breather off an R75,and i noticed that the vent pipe ran from the breather direct into the carb, whereas on my 77R100S i have the long vent pipe that runs from the front of the engine and not the breather housing at the rear , does anyone know when and why this was changed? Thanks Ian

[Rob Frankhamr]

Different years. Up to MY '77 (I think) the old breather system was used, thereafter the expelled air was taken in a gallery from the breather valve to the front of the engine as you describe. The gallery has a small diameter hole back into the crankcase and the assumption is that it forms a settlement space where oil in suspension can settle out of the expelled air and drip back through the hole into the crankcase. If that's truly the reason, I can't see that it was very succesfull

Rob

[ithebruce]

Thanks for the info Rob does seem a bit convoluted but hey.....BMW...Bloody hell! Lol!