Welcome. New member

Big problem with oil "leaks" or burning is the PCV system. Might not be the valve itself. The carb has a passage for the PCV that gets plugged up. Remove the carb, and use a drill bit (I think 1/4 inch) by hand to clean out the passage. You need to go from the fitting on the outside, and also up from the base of the carb. Also check that the hose is clear.