Twin-carb Air Cleaners

The main can (1) with the pressed-steel base (2) and the alloy plate (3), with tube (16), large washer (17), stepped rubber washer (15) and bolt (7). Interconnecting hose (12), filter element (14) and rubber sealing ring (13). Note this last goes between the base and alloy plate: Moss Europe

The bolts are UNF BH605401 for HS carbs as they screw into U-shaped brackets on the back of the carb flanges - AHH6731 front incorporating the choke cable support and AHH6732 rear, but are UNC BH505361 for HIFs as they screw into the flanges themselves: (Moss Europe)

Note the right-hand bracket for the rear carb is shown reversed, the flat side goes against the back of the carb flanges as for the left-hand bracket.

Early crankcase breathing arrangement showing the rocker cover hose going to the pressed-steel base plate. Note that this is on the outside i.e. the dirty side of the air filter, not the carb side as has been claimed from time to time: Clausager

Bee's two cans ...

... no difference that I have been able to find between front and rear:

Showing the filter element sitting on the base, confirming the rocker hose went to the outside of the filter:

Claimed to be a 1971 model, with remote servo, but curved cans which were not apparently fitted until 1972. However note the radiator which has the later centre fill but the earlier right-hand top-hose, and the non-standard brake master, so not an unmolested example:

Straight inlet with servo, but this is claimed to be a 1966 model so well before servos were available from the factory:

The servo is canted up whereas factory installation is horizontal, maybe to clear the inlet tube:

Straight cans changing to curved for the 1972 model year, the curved inlet going almost as far as the straight before it turns. The rear straight points directly at the bulkhead so may account for intake noise in the cabin, especially if grommets are missing:

Split in Bees rear can: