Can anyone help.
I ride a 2005 PX150E that was originally an American import but is now in Canada. It's SI 20 DelOrto carb was originally fitted with a 98 jet, though the Haynes manual says it should have been a 100. The previous owner had a Sito Plus muffler fitted, with a 105 jet, which still only gets me to about 95kmph before it seems to misfire. A local mechanic here (an ex Lammy owner) tells me it's running too rich.