I tested the engines today with another tech and got the same reading. My buddy said that this is not a R40 Aereos it is an older engine and it might be a Q500. hes never saw anything like that so he offered to buy the other engine off me for $60. I told him I will let him know I first have to talk to you guys about how much. here are some pictures of the engine so maybe you can tell me what they are.