BSA B40 Piston Std/Oversize .020"/.040"/.060" (41-0250/41-0252/41-0254/41-0254-1)
Condition: New stock
Piston cplt for 350 unit singles 1960-1968
C.R. 8:1
Std size: 79mm (41-0250)
Oversize .020": 79.5mm (41-0252)
Oversize .040": 80mm (41-0254)
Oversize .060": 80.5mm (41-0254-1)