I have this engine, and my question is do i have to put the high speed needle on it? Because my 4*60 has a little opening for the low speed valve, but for the high speed valve it wouldnt fit in there, so anyways i rather not use it.

Make the opening bigger so the needle fits

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You only have to install the high speed needle if.....YOU WANT THE ENGINE TO RUN!!!

Ok , what i did was put the high speed needle behind looking down instead of the normal way which would be horizontally. This way it fits perfectly, the valve will be easier to reach from behind, and now i ask you if there's anything wrong with doing it that way.

Sounds good to me. As long as you can adjust it safely while the engine is running its fine

good thanks