Have a 20001 kdx 220. need to know fuel oil ratio

32:1. You can run as low as 40:1, but not 50:1

The Amsoil is an excellent oil to use. I would use it or Motul at a 40:1 ratio.

Engine oil goes in the gearbox/transmission. Two stroke oil (also know as pre-mix) is mixed with the gas and oil in a separate gas can (to thoroughly mix the pre-mix and gasoline) and then the mix is poured into the fuel tank.

Make sure you have recommended spark plug. 2cycle bikes require a hot plug in order to burn fuel efficiently. I'm not that familiar with your bike but it seems too new-ish for the rings to be bad already. Another thing is... that you can't just use any 2cycle oil... you must use the manufacture's recommended oil for the fuel. Many of these machines are picky about which oil is used. Fuel to air mixture many times is the problem... this has to be just right on a 2cycle... they are touchy if they don't get the right amont of air. I hope somehting here will help you to find the answer or at least eliminate a few things if nothing else :)

40to1

1st warm up the engine or

I think the official ratio is 32:1 but a range of 25:1 to 40:1 is acceptable. If you run it wide open and hard most of the time, use the 25:1 or higher oil mix. If you run it pretty easy, then you can go up to 40:1 or less oil.

Good Luck

You could have fuel with to low of octane rating.

check engine oil and change the oil seal of engine

32 parts fuel to 1 part oil