sounds like your sucking a piece of crud up into the main jet. Pulling the clutch in takes the load off of the engine. No load = less fuel needed.
I would rotate the carb and pull the bowl and jets to see if you can visibly see what's causing your problem. Before you rotate the carb and pull the bowl off put a clean paper towel underneath it and drain the bowl, see if anything comes out or if anything is in the bowl drain (main jet access plug) With any luck you will be able to see the piece of gunk that's giving you fits.
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jeff
'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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