I bought one of those Bobcats from Cermark,and it came with a inverted TT 42--Only way I could get it started was to turn the plane up-side down --thereby putting the engine right side up.I bought one of those foam cradle thingys.I hand primed it ,and then it started with the use of a elect. starter,but it was still a hard motor to start.Think I wound up using a #A-3 plug..Never did get it broke in--IMHO --piece of junk.. Think the motor should be put on a motor stand ,and broke in properly..All the new Bobcats have the motor mounted right side up -----