Before installing new pistons and rings in an engine or replacing brake slave and master cylinder seals, the bores should be honed. Honing removes the glaze from the cylinder wall allowing the rings to bed in, and aiding oil retention on the cylinder wall.
These Replacement Stones are for:
- M241 for M238 Small Cylinder Hone (40-80mm)
- M242 for M420 Cylinder Hone (50-170mm)
- M240 for M236 Two Leg Hone (15-55mm) and M237 Three Leg Hone (19-60mm)
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