From
http://importacionescallaoembarcador...arzo-2014.html we knew who's the exporter
After search in chinese , there's a JV (重庆炙焱动力制造有限公司 aka
http://www.fuegopower.com) btw 重庆(Chongqing) 苏摩 (SUMO)进出口贸易 (Trading) 有限公司 + CHINA MOTORS INDUSTRY GROUP CO.,LIMITED
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most Chonda CB250 is 65.5 * 62.2 (as CRF230) , Zongshen had 69mm variety