Can anyone comment on the quality and performance of this engine. It seems to be a bargain at $89.99. I'm on a limited budget and am consideringinstalling it in a 4 Star 60. Any suggestions on a reasonably-priced alternate 2 stroke engine would be appreciated. I presently have a NIB OS .61 SF which was purchased many years ago and has never been run. Anyone have any experience with this earlier model? I believe it is the predecessor of the FX.