yes its actually my dads engine...he put a new great planes Escapade together and put this evotution on it...90 flies great at half throttle but after a few min. it starts slowing down and wont pick back up ... so it stalled and he fortunatly dead sticked it to safe landing on maiden flight... so we fired back up on ground let it set and run and same thing happened ...so i was playing with mix at half throttle and it locked up and spun prop and nose cone off.. after few moments u can spin engine by hand again...we been flying for a long time and never nothing like this ...is the fuel were using it evolution wrong?