Did you purchase the engine?

I have a 1.20 ax that has been run for 2-3 gallons...
They are very easy to disasemble...

At the very least, pull the head bolts and take the botton (cyl cap and look inside...
If you go further than that, take pictures...
That way you will be able to hav reference as to how it goes back together...
when you pull the cyl button, make sure the inner sleeve\cannula doesn't come with it...
Unless you want to take the back of the engine off and remove the piston...

Once you have done one, you have done them all (2-stroke glow)...that is...

I wish OS would convert the 1.20 AX to gas....