i have two 150 saitos one is 4 years old and one new. the high speed needle is about 4 turns open on the old one and 2 1/2 turns on the new one. both smoking like hell! that is where you should end up with a good smoke trail . no matter what the needle setting. if you can't richen it up to smoke alot better look at your fuel system. saitos like to {must be} run on the rich side or you will back fire and throw props. the smaller ones aren't so picky but the large ones are. good luck