yeah, pete s given you the good oil, my speculated guess would be it is more like 30 to 40 mm as on a small XL.
BTW: the specs for the GY-2 are (1) different and (2) i m not sure they are right, coz they are tight.
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM
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