Some guys think the SH based engines are junk and talk them down, but for a budget engine, I find them to be good engines. I haven't had any issues with them personally. Engines made by SH and sold under different names are XTM, Mach/Dynamite/Team Losi, LRP, and even their own SH brand. I've had several Mach engines and an SH. I've had to change bearings in a couple of them, but only after many gallons of fuel. If you want to spend a bit more money, Picco and Novarossi make a really nice engine.