I have recently purchased a Dazon 175 two seat buggy. Fun little ride. However, it has lost horsepower and sputters and spits when driving it. When it idles it appears to be fine and only seems to do it when under load. I changed the fuel filter, put in an iridium spark plug and checked and re oiled the air filter and it still seems to do it. Any ideas? Ia m leaning towards a carb rebiuld but not too sure. Any help would be greatly appreciated.