- May 24, 2007
1979 Yamaha IT400: Is bike suppose to die after a few seconds of idling? Every other bike I've had idles and stays idling with no problems. I want to be able to stop at a crossing and not have to keep the throttle turned slightly to keep the bike running. I may need to adjust the carb, 'cause as I am going down a hill or something and letting the bike slow itself down, the bike seems to lunge slightly as it decelerates. It is also hard starting after dieing from letting it idle after riding for a while. I heard it may be the main jet, but it is clean, do I need a bigger/smaller jet? How do I tell what the one is that is in there? The bike has the round-slide Mikuni Carb. Any help would be great. Thanks.