Hey guys, I have a bike that is running a little too rich right now. It has all the conditions: - Runs fine at cool temp, once heats up it runs worse - Black sooty plugs - Engine performance improves when the airbox is removed - engine won't idle at all, or idles too high The bike was running fine, and then it started to bog and wouldn't run so I put in new plugs and it got me home and kept stalling until I cleaned/swapped plugs. I'm not too sure what I can do to fix this? I've cleaned the air cleaner, cleaned the carbs, cleaned the plugs, did a compression check. I've been told I need to get into the carb, and bottom out the main jet and back it off 1 1/4 turns, and then back the idle jet 1/8 of a turn? By the way, the bike is a 1981 yamaha maxim xj650. thanks!