High idle after carb clean
I am a long time forum reader, but I almost never post. Mostly because I have only owned a bike for 2 years and have a lot to learn. Anyways...
I recently wanted to clean my carb jets on my 02' ZX6R. I am fairly mechanically inclined and I have slowly been stepping up the level of maintenance tasks. Following a great post on these forums, I took my carbs off, cleaned the jets and float needles, and then reassembled everything.
This is where the first problem comes in. When I was putting back on the airbox, I accidently screwed a long screw into where a short screw was supposed to go. This ended up hitting the plastic air vent T connection for the carbs. It may have cracked it, I can't tell for sure.
Now onto the symptom of something wrong. I ignored the cracked air vent, for the moment, and continued assembling everything. Mainly because I depend on the bike to get to work. When I got everything back together, it started up right away and seemed to idle and rev great. However, when I went for my first ride I ran into some problems. After accelerating to 9000 RPMS or so, then letting go of the throttle, the bike would very slowly rev down. Before this maintenance, the engine would quickly slow the bike if I let off the throttle. Also now, with the clutch pulled it, if I rev up the bike and let go of the throttle, it slowly revs down, and then settles at 3000 RPMs. I can't get it to idle any lower. If I back out the idle screw any farther, the throttle doesn't rest against the idle screw.
I am sure I did must have done something wrong when I put it back together. Anyone have suggestions of what to look at? Could this problem be due to a cracked carb air vent line? I also changed the spark plugs and cleaned the air filter.
Any help would be greatly appreciated! Thanks!