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oil leaks on 30cc 4-cycle?

Why is my new string trimmer Model # C430(ZRRY34420) spewing oil? Purchased new as a reconditioned unit. Gave my older Ryobi 2-cyle to son.
George Sulkosky, May 2011
Have same problem. Replaced both check valves now excess pressure from crankcase is blowing hose off of fitting. Wondering if I need new hoses or is the excess pressure due to something else.

manny, June 2015
link Click here to see other fixes for Ryobi C430(ZRRY34420).