[KenWittlief]

you might be able to find a service manual for the engine at your local (main branch) library

it would tell you how to re-set the needle valves - if not screw the one you were messing with all the way in (gently) then back it out 1 full turn and try to start it. if it wont fire crank it out another 1/4 turn and keep doing this till it starts

usually these engines will hunt (speed up and slow down) if the needle is screwed in too far, and will bog down and then quit if its screwed out too far (too much fuel)

definately check the plug - if the motor was running rich its probabally fouled out (covered with carbon and shorting itself).