It fits for CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Pass / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50. Bore Stroke: 52.4 55.5 mm/2.06 2.18in.
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