you may not be able to make your motor ever run right again as you might have run it to lean and scored the piston or sleeve try to rich'en it up at 2 1/2 turns and run it for a few seconds then lean it a click or two at a time until it is running good but if you start to see it die then land quickly and rich'en it up 2 to 3 clicks if it wont build power or just bogs out then you'll probably need to head to your local hobby shop for a new one.. Oh also change your glow plug sometimes that will cause a strange problem too

hope this helps