I have a 79 invader 440. Starts first pull but oil and a little gas pouring out the exhaust. Rebuilt carbs, replaced carbs. Rebuilt fuel pump, replaced fuel pump all for the same sympton. Let it run 3 min. a pool of black oil on cement, more on mag side than pto. Adjustment issue or oil pump. Have been messing with for 2 yrs off and on.
Assistance Please
David