Trying to help my buddy get his '01 summit 700 running smooth. It seems to be running fine at higher rpms, but you have to stay on the throttle a little at idle so it won't die. Additionally, when you brap it from idle it seems to back fire a bit. I took a look at the main jets and and they appear to be 280's. I'm thinking this is a pilot jet issue, probably running fat on the low end. Anyone have any ideas to try out, or have a jetting chart? Thanks for the help.