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Big bore kit 180cc for Honda Grom Msx125. Kit including: 1. Four valves cylinder head with valves EX21.5/IN23.5 2. Cylinder kit with 63mm piston and wrist pin 3. Manifold; 4. Ecu; 5. Camshaft; 6. Rockers with rollers; 7. Longer chain and studs; 8. Connecting rod; 9. Hardware.