Hello; I was given a Cox .049 on a Corsair C/L in 59-60, but the first engine I actually bought for myself was a Webra Silverline 40. It was $30, but wasn't much of a bargain, since I never got it running very well. Then I bought an OS 40 FP, and haven't looked back since. The next one was a Saito 45, which changed my mind entirely on engines, since I bought about 50 or 60 4 strokes since then.