I have a tower .46 also, came stock with trainer... when i go to fire it up it will prime good, run good until i start moving it around, i can sit there and transition high to low no problem, but when i taxi around it seems to die... ive tried switching fuel lines making sure i had the correct one where it needed to go and all that... ive adjusted it to the only place where it will run. It just dies on me when it moves, also if i point it upwards it revs real high and quits like its leaned out? but thats the only place on the carb settings where it will run high and low...