14.5 HP Briggs blowing lots of blue smoke
Mom's rider is blowing blue smoke within 5 min. of starting. Runs normal then acts like somehow a oil line has been allowed to open direcly into the cylinder because the blue smoke could be used by the military as a cover for defense. No need to say engine then runs rough.
Crankcase has normal oil level. I took breather ( I think it would be called the breather) off and opened it up and cleaned it hoping it would help. The fiber disk moved freely. No improvement. Adjusted valves late last sason because of hard starting and ran fine afterwards and until recently.
Engine starts fine and seems to have normal compression.
Need some advice please.
Engine is a model 287707 type 0224-01 single.