Breather box - hose sizes
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
- Inlet hose (right side): ID = 18 mm (~ 11⁄16 inch); Length = 60 mm (~ 2 3⁄8 inch)
- Return hose (middle): ID = 8 mm (~ 5⁄16 inch); Length = 60 mm (~ 2 3⁄8 inch)
- Atmosphere hose (left side):
ID = 14 mm (~ 9⁄16 inch); OD = 17 mm (~ 11⁄16 inch); Length = approximately 600 mm (~ 24 inch)
Thanks to K. Ross Raymond who posted the following information on the old Yahoo! Loopframe_Guzzi news group (which has now moved to Groups.io).
It is somewhat difficult to source an atmosphere hose with the proper ID and OD that is also oil tolerant. Here is one source for such a hose: Pelican Parts part number N-020-371-1-M21.
Thanks to Charlie Mullendore of Antietam Classic Cycle for providing this alternative.
I bought a length of silicone rubber hose from McMaster-Carr. Kinda of a brownish-black color, slips right up onto the breather box snug, thin wall so should fit into the bracket no problem. I don't use the bracket, but a vinyl covered
Pclamp from NAPA attached to the lower right bell housing bolt instead.