thanks..I just want to be a bit cautious ..I would hate to break a great engine.I cant wait to fire this up..if it performs as I suspect it will my nexy purchase will be a 120 and hello giant scale..gotta love this hobby!! cant wait to hit the wram show as I am just an hour from it.and see all the new stuff.. thanks again andI have one more question and its about the fuel for ys..ys seems to stress 20 percent oil.this may sound stupid but when I was at a local hobby I saw a bottle of castor oil..I am presuming I can add that in proper proportion to model fuel to get the oil cntent .is that ok or not a good idea??