BSA B33 monobloc air filter adapter
thingiverse
Adapter to use an air filter with a monobloc carburetor on a BSA B33 plunger as the standard filter adapter won't fit when using a monobloc on a plunger. The end with the 'teeth' clips over the outside of the carb and should be attached with a jubilee clip. The other end inserts into the air filter (ID of 39mm) and should also be attached with a jubilee clip. Attached is the STL for printing and the f3d file if you want to modify it. We printed toothed end down which worked well.
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