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BSA M21 Piston +40
BSA M21 Piston +40
BSA M21 Piston +40

BSA M21 Piston +40

B165/040. 12659.040. 66-1217. 70-8157

with gudgeon pin and rings

040=83 mm

Replica

Compression height: 31 mm

Piston Clearance 0.12mm or 45thou

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