im not going to touch this argument but i will say that this motor started up PERFECTLY on the first flip on the first try and it is set WAAAY rich from the factory, too rich! it sounded like a 4 stroke on full throttle but once you lean it out and raise the nose and clear the muffler- youre scot free. I had to take off the mixture limiter to get it running right as i think the needles are set to a preset limit. u might want to check into this. where i live is close to sea level and its ALWAYS extremely humid so maybe thats why. i broke her in on the ground as instructed and MY RTF kit said to do the engine break in. it is always advisabe to do this as im not risking as a new pilot a deadstick on a brand new trainer. im happy with the nexstar. it IS a different plane from what ive flown before. 60+ flights and 1 mishap which was a broken wing! i hit stadium lights 30 feet up. JUST BARELY clipped the right wing. the pivot wing mount DID save me from buying a new plane but i bought the arf anyways(only $20 more than just the wing so DUH yea i got the arf) the wing came out and lodged miraculously UNDER the plane as to which she landed on all 3 wheels ON THE BROKEN WINGS. Talk about luck! i thought i had a years supply of toothpicks for sure. but nope- just a wing! this plane stood up to a beating- go figure. had 40+ flights since! no problems. irrpcanada- if you have questions pm me or post here!