a question for the people that have good running mds´s

does it need a lenghty break in?
during this period, is it hard to tune?

i´ve seen a couple on arf´s at the field, did not pay much attention, but they were hard to tune and the "expert" just told the guys to replace them.

on the other hand, isn´t selling a long break-in engine with an arf defeat the concept of an arf?
i think it is a crime to do so considering who buys an arf trainer, a guy, that wants to fly right away, and has little or no experience. and will become quickly dissilusioned with a tough engine...


diego