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When my 150cc TaoTao's valves were out of adjustment, it would overheat when running WOT and would bog down and die. It is very possible that if they redid your valves, they are seating and need re-adjustment. It's not that hard to check them, and it's free, unless you have to have someone do it. If so, take it back to where you had it done and have them check it. Was there any kind of warranty on the rebuild? I don't think it unreasonable for an engine to need some re-adjustment during or after a break-in. JMHO
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