250-500cc 2011 wr250 running like a bag of nails

Can somebody help please, my 2011 wr250 is running like a restricted 50cc scooter.
It doesn't want to rev out to the power band and its not sounding crisp and sharp. Power valve is operating ok but bike is still feeling really under powered.
Cheers
Dom

Is your exhaust restricted in any way? reeds in good shape?

Change plug and spark
Comp chk
Chk reeds
Mouse nest in exhaust
Mouse nest in air cleaner
Clean carb
Turn off choke lol (I've forgotten it on before)

Hi, no exhaust is restriction free, one of the reeds is slightly open. We've noticed slight rubber wear on carb boot and reed housing too. Looks like previous owner has had this issue before and has used a gasket sealer of some kind.

It would still rev up with worn reeds do a comp chk and clean the carb that's what I would do first. Most people put sealer on reed block to prevent air leak that some came with.

good reply.also have seen wasp nests blocking all holes

bad ground or a nicked wire on the ignition module?

Are you sure you pv is opening? I had bugger all power on the weekend too. Thought it was seizing after a busted radiator incident.
Pulled pipe to peek at cylinder, looked ok. Worked pv manually an it was only opening about a third. Turns out a little grub screw came loose on the lever that lifts the pv.