from what i heard another pilot at my field had a ft300 twin on a uglystick and he said that the engine was getting unreliable,and took it off put in place a two stroke i dont know why he would do that, i think its due to not cleaning it up after each use or that he doesnt quite know how to adjust the needles correctly, if you dont clean it up around the carb the fuel will become jelly like and clog up the needles i use wd40 once in a great while to help break up the jell and it really works plus i use an aircompressor to blast the stuff out make sure that no dirt is around the opening of the throttle carb clean most with a clotch first then air it out.

oh and by the way my o.s engine is 14 years old and starts from the first spin on the starter! im the 3rd owner