Hello, I don’t know if you engine is a 500 or 600 or what oil you are using but for the record all my 600 engines are run on 200 main jet and I use a low ash 2 stroke oil at 5 to 6 drips per minute plus 50 to 1 in petrol. Suggest you cut down the oil and sort out the leak in the exhaust before trying anything else. Best wishes, Jeff.
