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#P10573
Polini 50cc cylinder and crankshaft kit for Derbi D50B 2-stroke engines.
Complete performance rebuild kit including cylinder, crankshaft, and bearings, designed by Polini Motori for durability and balanced power delivery on all Derbi-based 50 cc motorcycles. The cast-iron cylinder provides strong torque, long life, and reliability for both everyday and sport use.
Includes:
Cylinder kit (109.0018) – cast-iron Ø39.88mm
Crankshaft (210.0053) – Polini reinforced crankshaft
Bearing kit (282.0004) – high-precision crank bearings
Polini 109.0018.1
