I've worked with at least 8 diferent 40 and 46 size engines with no problems. The mixture limiters are easily defeated or removed, permitting more power than is provided for the novice enthusiast. See the engine review in the February 04 edition of RCM by Clarence Lee. Highly rated in the 40 and 46 sizes.

With the high standards set by Horizon Hobby, and their superb customer service department, I would not hesitate to purchase one of the 60 size evolution engines.