Personally I don't know why you would need to use Mapp or propane on the Aristo Mikado if the gas modulator in the tender is adjusted properly. The shortcoming of this engine is the small water bath they had around the butane tank. Some people had a problem with too hot a flame and smoke box fires melting the plastic stack and cylinder covers. But some of that could be blamed on an improper flame shape on the poker burner. I have never had problem with too cool a flame as long as the water bath heats the butane tank sufficiently. Plenty of heat to blow off the pressure relief valves regularly .