Feel free, you may want to find out from Miguel if catalytic converters are common on new peds.
A converter does get rid of unburned hydrocarbons but I am surprised that the oil does not gum it up. I had never heard of a catalytic converter on a two cycle.
I read an article recently, I believe it was on Motorcycle.com, about a new Vespa 50cc scooter which uses a secondary cylinder to inject the fuel into the combustion chamber. They seem to have solved the fuel injection problem without the need for expensive computer control and fuel injectors.
Apparently, this engine meets the euro emission standards so maybe we are about to see a neww generation of clean peds.
Of course, there are some 4 cycle peds which are already clean running.