I continue to have problems with this evolution engine....I contacted Horizon Hobby and they will not help as I can not find proof of purchase although it is obvious that the engine is almost new....Four tanks of gas and it is hard to start, sounds like the bearings are shot and leaking oil at a high rate at the front. ( afterrun Oil )....Has anyone had these problems and have you found Horizon Hobby difficult to deal with...They are the only source that sells this engine and I purchased by at a R/c Airplane Show...new in the box....This may be a good reason to only purchase from our LHS and for darn sure do not lose the receipt either way....I am new to the sport and would be careful dealing with Horizon...They have not replied to my second email...That is a concern...