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Vertex 23653A Piston Kit Big Bore +3.20mm Oversize to 79.96mm for 10-17 CRF 250R
Vertex 23653A Forged Big Bore Piston Kit. Kit includes: Piston, rings, pin, clips.
Vertex Forged Big Bore Piston Kit. Compression Ratio: 13.2:1. Size Over Standard: 3.20mm. Vertex offers A, B, C, D, sizes so that the customer can properly fit each piston to the cylinder. The difference in the sizes is 0.01mm (0.0004) increments with A being the smallest and D the biggest.When a cylinder wears, the customer can choose the next larger piston size to regain the proper factory fitment.