I'm not a fan of Evolution engines. They're ok as an entry level engine for beginners. I tell my students to go for better quality engines if they decide to get more serious about flying. I see them wear out and on a rare occasion fail. Once you have 4 or 5 tanks of fuel thru them I throw away the blue restrictors on the high and low speed needles and dial it in. Those are there mostly to keep beginners from getting out of control when adjusting. Use engines that are popular in your area. Here at home its Super Tiger, OS, Thunder Tiger for the higher end. Some Magnum engines are ok. You just have to look around for what works in your area and for people that know how to dial them in perfect.
Edwin