I run stock jetting on my rebuilt  85 lt250r and I run 32:1 amsoil dominator .  Mixed in tuff jug with 93 octain . starts great idles great and runs great. The plug color is great as well I have 20 hours on motor. From putting around with my kid on it to me alone riding it like it was intended to be rode still on same spark plug as well. the manual says 32: 1 why would anyone  change from that if they are still running stock jetting ?