i have one with a ys 1.20. awesome flier. with the ys it balanced a little nose heavy but i was able to move my battery so i didn't have to add any weight. as tailtwister said removing the covering below the fire wall is a must to aid in attaching the cabanes to the aircraft. also on the top wing mounting bolts, the ones that attach the wing to the cabane, i assembled it and the used jb weld to "weld" the nuts to the cabanes to ease and speed up assembly at the field. only complaint is the mostly solid blue covering, tough to see on a nice day so make sure you do something to the top or bottoms of the wings. it has awesome flying characteristics for a bipe, not squirrely like a pitts, i however would look for a engine with a little more power than the saito 100. good luck