I've checked the jet and blown it out with compressed air, still no good, how ever my grandfather gave my his old briggs. 2 stroke, the cylinder is scorched and it needs to be bored out and a new piston and rings, but did take off the carby and put it on the victa, runs good now except it just keeps increasing the rpm when the throttle is fully open, i have not let it peak yet as im afraid it will cease up or blow the head. there is no adjustment screws only the idler.