I was testing somethings and noticed that if I set my idle to like 3k, rev it a few times, it will come back down to 3k. Now if I let it warm up / ride it a little bit like that, rev it, it will only come down to like 4.5k, not the 3k. I tried a few revs to see maybe if it would evently drop but it didn't. If I shut the bike off and start again it goes back to 3k. Any idea what would cause it not to drop back to the initial 3k?