FCR Low Speed Hesitation

After many years swearing at, and figuring out to a minor degree, Dellorto carbs, I am now facing an FCR on my 2006 FE450. I know near nothing about it. It works great, except..... when in slow going on tight trails the motor eventually develops a hesitation right off idle, where I like to blast out of corners. Seems to be heat related. I am guessing this to be the case, as the condition disappears when the bike is allowed to cool. I am actually thinking of running without the thermostat to see if there is a difference. I am running at 7500-9500', fuel there does vaporize a bit more readily. Does anyone have any advice about carb or bike set-up that might apply to this situation? Buzzard

Thanks for all the info so far. My jetting is spot on for the altitude, plug runs a medium to dark brown. As I said, my Berg runs perfectly until I get into slow going. This slow going is miles long twisty forest trails. The unwelcome symptoms do not show up until quite a ways into these trails. Short sections of slow going do not bring this about. If I stop to eat an apple or something, bike cools(I am guessing), and all is well until we go a ways. This is not a crippling hesitation, just annoying enough to distract me while I am trying to conquer this trail. Also, there is a GasGas 200 that gets ahead of me, and it becomes an issue! I will fabricate a tool to adjust the fuel air screw, and try some other settings. I am running the highest octane fuel, short of race gas, that I can buy. This is the only thing about this bike that needs a fix, what a GREAT motorcycle!
Thanks, Buzzard

Thanks again, everyone, for the helpful replys. I think I may have solved some or all of the problem. I pulled the fuel tank, drew up a chair, and stared at the beast. I noticed first that this FCR carb is the one for those odd orange bikes, in that the fuel inlet is on the left side of the float bowl. Husaberg had to indent the exaust pipe to clear the elbow on the side of the carb. Then they route the fuel line straight forward out of the carb for 2", and with a factory bend in the rubber hose, do a 180 and route it back, all of this a fraction of an inch from the exaust pipe. This fuel cooker pre heater may be great in northern latitudes, or on the diesel version of this bike, but was not to stay on my Berg. I re routed the fuel line straight up and over the top of the air inlet bell to the right side of the carb, placed the T there, and fed to both petcocks. I took a ride on some of my best torturous, rocky, steep trails, and no hesitation! Just perfect behavior, can't think of how it could be better. Well, yeah I could, get an FCR with the fuel inlet on the right side of the bowl. Let the oddball orange bikes indent their pipes to clear the inlet, and pre cook their fuel! Hope this helps someone else. Heck, I hope Husaberg reads this and adds it to the ever shortening list of needed fixes!
Buzzard

Taffy, this inlet is a brass elbow, apparently sealed with O rings inside the bowl itself, as it swivels about. The other end is a 5/16" hose barb type connector to attach the fuel line to. It sets in an indentation in the exaust pipe, where the pipe swings inside the frame to clear the kickstarter. Clearance is 1/4" at best. This indentation in the pipe is large enough to rest a ping-pong ball in, with about 1/4 of the ball in it. Not impressive engineering IMHO.
Dale, as usual, you are right on top of it! I do hope to move it to the right side, as this does bother me a bit. If I cannot do it locally, is this a service you offer, mail you my float bowl, and get it back much improved?
Thanks, Buzzard