Mapp gas is awsome!!!! Just dont try it like I did with a propane torch head,,,Big fireball,,luckily only minor facial hair loss,think I got the preheater fixed,,need to test this AM,,got a small run yesterday starting around noon,,,had to fix the surge 76 (pulley loosend up),,Ray got the international serviced yesterday,,2-speed works agine ,nice with 1200 gallons of sap to have that working,,changed oil,,fuel filt,,checked Hoit road and rte.11 with Vac. running found many of the spiles had loosend in the spile extensions and were leaking vacume,,,looks like great weather for the next 2 weeks GOOD LUCK TO EVERYONE!!!!!!!!!