I have a 390 kitted MS290. It has always oiled poorly. The chassis is pretty old, oil pump is original but looks perfect. Been taken apart multiple times and cleaned, checked, and cleaned and checked again, It only goes through about 1/2 to 1/3 tank of oil in a tank of fuel. Its on the max setting. Running 325 .63 ga chain on a 20" Tsumara bar because it cooked the old bar and its what I had handy.
Is there a way I can increase the output of the oil pump to run a 25" bar or at least competently oil the saw?
Is there a way I can increase the output of the oil pump to run a 25" bar or at least competently oil the saw?