My ever reliable Poulan Micro xxv which I bought new almost 30 years ago has stopped oiling the bar. Have removed and cleaned the filter and blown out the passageways and jets, but still no oil. Oil chamber does not appear to be pressurising as it does not go "pssst" when I crack the oil filler plug. Is there a one way valve between the crankcase and oil chamber which may have failed thus preventing the oil chamber becoming pressurised? If so is it accessible and serviceable without splitting the crankcase?
Jim
