Just back from flying my reworked 4 star 40 it flew GREAT ! I replaced the aluminum engine mount with a fiber glass mount and removed the aluminum spinner, which reduced the weight , and moved the Saito 56 aft 5/8 of an inch,rechecked c.g. , removed 1.5 oz tail wt. and moved rx batt. forward 5 ", plane balanced a touch nose heavy .Next I had to shimm the motor mount 3 degrees up, to get the 2 degrees down thrust that was built into the kit ? Love the 56 F.S., sounds great and plenty of power , flew for 10 min. only used 1/4 tank of fuel, it was a little to windy for me so I got her down and and just watched my hands shaking for 10 more min. What fun !