good day all,

i picked up a Victa Hawk 2 stroke lawn mower for $20. I did a quick rebuild of carb and replaced the front rubber plunger plate.
Anyways the mower starts really easy and runs well at low speed, but when I crank the throttle to RUN position it revs up and then hunts up and down continually. I would suspect that there is a leaking seal somewhere, but was wondering if anybody has come across this problem before and point me in the right direction. And if it is worthwhile repairing it.
Also noticed when I forgot to turn the fuel tap off and went back to the mower a few hours later the cylinder must have filled up with fuel cause I pulled it over and petrol sprayed out the decompression device. Float problem?