Rough running pulling my hair out

AAAAhhhrrr.
I have a road registered 03 plate, Husa 470 with standard Dello carb.
I have a massive problem with rough running. Under power the bike pulls like a nutter, but if I try to hold a regular speed at below half revs the bike will not hold a constant and feels like its miss firing or not fueling and if I pull the clutch in to stop or slow it cuts out. This is when the motor is hot for the first 10 minuets or so it’s ok.
The bike has been into a Husa dealer who tuned the carb and changed the flywheel which helped but hasn’t cured the main problem. I was told the 470 has the highest compression piston Husa make and I understand how and why this would make running a little more edgy.
Surely the bike should run and idle better than this. Common sense tells me it’s a fueling issue but the dealer seemed to think it may be electrical.
I haven’t ridden another same bike so can’t compare the problem. What I need to know is, can I expect the bike to run correctly on the road (as I’m thinking of supermoto set up) and if there is a fault, what is it?
I would massively appreciate any help.
Thanks Steve. :x

Hi Dale
Thanx for the response, I will consider your offer if it comes to it. I can't help that think there must be more to the problem as the carb has been professionally tuned already.
It's good to know how the bike should be running which at least this means the problem is fixable.
Hopefully i'll get a few more responses.
Regards
Steve

Ha Ha what have I started. First time on your forum and think I'll keep tuned in.
as for my Husabitch I've spoken to the dealer and he's going to take it back for a futher look, turns out he only took it round the yard for a quick test.
Also I spoke to the chap who had it before me and he tells me he added a supertrap to keep the end can noise down I imagine this could be an issue.
Dan, I made a note somewhere of all the carb parts, I'll post it up. The dealer had looked at these and seemed to think they were ok.

Sorry for the slow response, the bloke at work with the big stick keeps me away from home a few nights a week.

Regards Steve

Up date on the rough running problem

The bike went back to the dealer who took a closer look turned out he had only tested the bike around the shop yard, my problem was starting after 30 minuets or so.

After breaking the head it was found that the piston was damaged and was replaced.
The stator was breaking down whilst hot so was also replaced.
All in all with a few other bits the repair cost me 750 of the finest in sterling.
The moral of the story seems to be - don't buy a bike from e-bay.
I don't think the engine was ever given the maintainance attention it needs, It had been thrashed and knocked out on the web!!

However, it is now running like a dream and after a recent closed circuit day out I more than glad I got it sorted.

Thanks for all your help, look forward to contributing when I can.

Steve