Hi Bumps I'm just a bit concerned with the colour of your smoke.I mean if it appears to be blue then that is oil burning.A mixture problem would be more of a black smoke.A two stroke can run with worn out rings it will just burn the oil a lot more and the fuel will pass though the rings going into the upper cylinder.If it's not to bad it still could be a sing of wearing rings.Using a lot of fuel is also a sing of ring problems.I just don't want you to go through all the trouble of finding a spring only to still have the blue smoke.See if you can see through the muffler port you might be able to see how the rings look.
