I have an 01 WR426. When it's warmed up it will not settle down to ide properly. When I cut the throttle goes down to a high idle for 2-5 seconds before it settles all the way down. This is real annoying when I'm trying to compression brake down an obsticle. What causes this? The bike has the snorkle removed, JD jet kit for altitude (9000 feet), and GYTR insert on the stock exhaust.