I'm not too sure if the lead helps a 2 stroke with any type of lubricating properties Tetraethylead was originally added to fuel to lubricate and provide a cushioning layer for the valves, an increase in octane was an unexpected side effect of the Tetraethyllead. A 2 stroke only relies on oil for lubrication. The best reasons for running Avgas are the consistency and quality control, no alcohol, availability, and cost.