Hi Cartman123,
First of all it is irrelevant the position of the brass screw (main jet), as long as it is screwed in but not too tight, remembering it is screwing into thin wall plastic.
When you check spark, the spark plug must be earthed onto the engine or cylinder head. Be careful that fuel escaping from the engine does not ignite! If there is still no spark, try a good known plug and check again.
Also, did the float have enough movement to allow fuel to enter fuel chamber in carburettor? Sometimes with a new needle the float does not have enough movement to allow fuel to enter. Also, pointy end in first to the seat with the needle
Hope this helps
