gpx250 strugling to get through the rev range

Hi all. I am finding that my bike is struggling to get through the rev range. It also feels that it hits a flat spot, the bike seems to loose power for a second then regain power, but this has only happen a few times.
The bike is fine till it gets around 8-9k rpm and then it feels very slugish, almost like if the clutch is slipping but revs dont seem to go up fast like a slipping clutch?
any ideas??
Cheers
Glenn

Or maybe some idiot (me)put his waterproof pants under the seat which was blocking the air intake I thought I packed it away from the air box. Well hopfully thats the problem

hahahaha....sounds like something I would do.

my zzr does that

I think like me time for a bigger bike

GlennB, before u start ripping the engine/gearbox apart, try changing oil and cleaning/changing air filter first.

I'm not sure if it's happening on my ZZR250 but it's certainly not bothering me.

hahahaha.

I can see the ebay add now .....

Improved horsepower mod for your 250...

Forsale one set of mesh wet weather gear. guaranteed to help airflow but absolutely useless in the rain.

Cheers Brett

lol