i wasnt to crazy about the stock engine my self thermal it gave me some issues on my nemesis. but since i changed to a .28 i couldnt be happier. other people seemed to have better luck with the stock engine. i wouldnt sell it i would mod the engine mount and go with a .28 or .32 or wait till the new CEN GST come out with its new upgraded 46. i sold my engine on ebay with pipe and made 135 dollars on it