turn the idle screws all the way in and then out 2.5 turns. Make sure you have a fuel regulator on it for about 2.5-3 bar. check the floats are all equal and that the diaphragm are in good condition and not shriveled up. Pull choke and turn key. One running adjust the idle screws equally until smooth. Take to a rolling road and get them setup properly (Worth every Penny)