1.

引擎
型号: APRILIA SR2000
Original Size: 41x37.4 (50cc)

Big bore Size: 47x37.4 (64.8cc)

2.

引擎
型号: SR50 L/C
Original Size: 40x39.2 (50cc)

Big bore Size: 47x39.2 (67.9cc)

3.

引擎
型号: RS50
Original Size: 40.3x39.2 (50cc)

Big bore Size: 47x39.2 (67.9cc)

4.

引擎
型号: SR50
Original Size: 40x39.2 (50cc)

Big bore Size: 47x39.2 (67.9cc)