I bought a XYZ gas engine. A new brand in the market, I believe, cheap price and looks pretty fine. However, I couldn't put it into the air frame and test it or fly it because it came with a bent cankshaft. [:@]

I was in communication with the Hong Kong based seller for countless times, and also with the manufacturer twice. I was promised a replacement, but have been waited for a few weeks till now and there was still no sight of the replacement. [&:]