注意：检查凸轮盘，如果它们磨坏了就成对地更换。
ATTENTION: Check the CAM discs, if they are damaged replace them in pairs.
由于排汽凸轮盘不正确的定时或排汽系统背压过大（背压不能超过300毫米水柱）而导致燃气通过扫气口倒流。
C. Blow-back through the scavenge air ports, owing to an incorrectly adjusted exhaust cam disc or large resistance in the exhaust system(back pressure not exceed 300 mm wc)
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