LuvBipes and MinnFlyer; Thanks for the replies, just checked the weight of the engines you guys used. Saito 150 is almost identical to the 1.60 FX and the OS 160 twin is only 6.2 oz heavier. How did these engines balance out? Did you have to add any weight or were you able to get the CG right by just moving the radio gear around to suit? I don't really have anything against 4 strokers, just a little intimidated by all those extra moving parts in them. I love the simplicity of a 2 stroke, so far if I put one into the dirt I've had success pulling them apart, clean them up and away they go again. BillyVan