A few more comments. First, don't be afraid of 4 strokes. I got my first one about 20 years ago. It was different than a 2 stroke, but not much. Still the same basic steps, prime, start, adjust needle, fly. Only big difference is occasionally checking and adjusting the valves. The Saito manual tells you what you need to know. Also, don't be afraid that you aren't getting the latest and greatest. Just because a model has been replaced, does not mean it's not a good engine. I still get great service from my OS 25 FSR. Bought it somewhere around the begining of the '80s. And finally, buy several engines at one time. Be sure you are dealing with someone at the shop who can make decisions. You should have great bargaining leverage if you're buying several things. This is especially true with the high cost Saito that nobody wants. The store owner will be highly motivated to close a deal to get it out of the store.