Bought a new zenoah G-26 engine. Mounted it and tried to start it till was blue in face. All it would do is pop through the muffler. Took it back to where I bought it and they sent it in to Horizon. Turns out it was out of time. The timing disc is on a taper on the shaft, and it had slipped.For what this engine cost that seems like a pretty poor setup. They need to put a woodruff key in this so it can't slip. A hard nose down landing and you'll be sending it in again. Just my two cents worth.