I’m with Swoop, Schu and Rt325 on the worn nozzle and the needle. I have a 350 Alpina I got with 17 miles on the odometer. After many years it was running rich like you all describe. Egg shaped hole in the needle jet. I replaced the needle and jet and it ran great.

Someone pointed out before on this forum that large displacement two strokes can have dramatic pulses in the intake tract that hammers the needle back and forth in the jet, wearing it in an oval or egg shaped pattern pretty quickly compared to smaller displacement machines..

I replaced the needle jet/emulsion tube and the jet setter o-ring (item #7) and it's running much better now. Thanks to all who contributed. It's a great forum!

Good to hear , but why not go the whole hog , and replace the needle as well .
Then you will have removed all the wearable components , for the best result .