BSA Pre-Unit Primary Cover Gasket 42-7507 (1) Alloy carburetor tuning

carburetor tuning

Switch is "Rotary" and has 2 Positions

Did your air box rubber grommets break

We have been waiting for this part to be Reproduced for a long time

Often times its Missing from the "Barn Find" Engine

BSA Pre-Unit Primary Cover Gasket 42-7507 (1) Alloy carburetor tuningNew English Made BSA Pre Unit Singles & Twins Primary Gasket. Stop annoying oil links by installing a new primary cover gasket. This primary cover gasket is compatible with models that feature the swinging arm frame. Replaces BSA part number 42 7507. Fits BSA pre unit twins (A7, A10, Goldenflash, Super Rocket, etc) from 1954 1963. Also fits BSA singles (B31, B32, B33, etc) from 1954 1957. Please refer to your parts book to ensure the best fitment.