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For installation this size of set engine boring is not required. Just plug and play.
Big bore kit 90cc for Honda Dio50 Af18.
Kit including: l/c ceramic cylinder kit 50mm with l/c head, crankshaft 44mm long stroke +1.8, crankshaft bearings 52*20*12, needle roller 10mm, spark plug and oil seals.
For installation this size of set engine boring is not required. Just plug and play.