Steve, the Saito 125 is rated at 2.2 hp according to their website with a weight of 24.69 oz with muffler or 21.87 engine only. The YS 110 is rated at 2.1 hp from what I read and it is 28.12 oz with the muffler. With the Saito lighter and higher hp for almost the same price, why would I go with the YS 110? The fuel pump? My local hobby shop is not huge on the YS and says parts are hard to come by, but I only have an OS to go by from my own personal experience.