Ran the new YS today and it is nice and powerfull! Sweet so far. Yea, OS did make a good engine, I have run them for 30 years. Notice I said did. The new ones are having problems. Not all of them are bad, but more and more are quitting using them. They are peeling liners, having heat problems and others. Like TT, some guys really like them, some don't. I used to swear by them. Not any more. I just went through my closet of unused engines that I bought for future use. Its amazing how many of them are OS. Some of their old engines are bulletproof! Glad i stocked up on them a long time ago.