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Bring some octane booster ahead... If can't find the proper stuff, somthing like http://item.taobao.com/item.htm?id=43469630240 (It's refined naphthalene NoT the modern formula mothballs) is good...

Plugged fuel system just basic syndrome of shitty fuel. http://www.motorfans.com.cn/thread-17001129-1-1.html Stunted rings/ Valves bent ... also possible.