This YS .61R FR engine is a new Limited Edition Classic of the old YS FR engine. I think first sold in about late 2012 and only sold in limited numbers (made be 100?) for a few years. Original price was over $400 with shipping cost, and I added the rear exhaust for this engine. These newer engines were CNC machines with a refined fuel system and upgraded internal parts weighing 545 grams. There might have been about 100 made and distributed:  See this link from RC Universe and there was no marketing news as I know of, as these were sold out very fast:  Anybody interested in a NEW YS shortstroke? New, as in produced this year... - RCU Forums

I got 2 from Paul Pappas directly. I also got a few very rare custom-made YS 60 pistons/sleeves and rods from Paul back in the day. they were very limited and not cheap. Look for them for sale soon. Not cheap but very rare:o) What you see is what you will get. Shipping will be $15 using USPS Ground advantage. At this price, I will barely get back my original cost for the engine and exhaust after eBay ~15% fees plus shipping.