Check out their answer here: Why Won't My ATV Idle Without Dying? - ATV.comI have a 2000 Honda foreman 450 ES 4×4. Cold starting the ATV and it starts up and runs for a second perfectly fine. No matter if it’s hot or cold it will not idle. After a few seconds of running it starts spitting and sputtering and will eventually die completely and won’t start back for a few minutes.