hesitation when opening throttle

[nickodemon]

Checked the air filter it was okay. A little dirt when i gave it a good tap on the garage floor. One thing i did notice was the foam ring at the bottom of the filter was wet with petrol. the air box was slightly damp, but not full of petrol. There is a tube on the l/h side which had a bit of emulsified oil in it. I checked the end of the tube where it goes into a small black bottle beside the front chain sprocket then out the other side (breather) it was clear.