What causes High Idle on startup....

[Dog86]

What causes a real High idle on startup. When I fire up my banshee it Idles real high to the point where I have to put it in gear and put the engine under a load. This only does it on a stone cold engine. The rest of the day it will fire up perfect and run just fine. I know it need some jetting tweeking but its not crazy off on the jetting as it has been the same for a few years and I have changed nothing. It is also boggy for the first few min but when it warms up it runs perfect. I am just wondering where to start at any help would be nice. Thanks

[volcrano]

sounds lean on bottom circuit.richen the pilot air screws 1/4 at a time inward,equally to both carbs until problem subsides.go 1/4 turn in,then wait about 10 seconds for motor to catch up to changes and ride.repeat as necessary.look up the jetting sticky to see if u nees to go to a different pilot.prob. not,esp. if u are stock.any mods u have done?that will also help diagnosis,but i would richen air screws.

[Dog86]

The banshee has a cool head with 21cc domes with FMF pipes and just a slight overbore but nothing major. Also a advanced timing plate adj, to about 4 degrees advance. I'll try the air screw and check it out. It has been awhile since I have done anything to her but it has always done this a little bit. I'll give that a shot first Thanks

[Larry's Shee]

might also clean carbs paying close attention to pilot circuit & jet