I just bought a Zip Ty fuel screw for my 98 WR400. Keihin 39 Flat CR. It is definitely the correct one. I put on the spring, washer, then O-ring. Slid it in, screwed it tight, then backed it out 1-1/2 turns. It feels like it is loose and wiggles a bit. The screw head has numbers 1 2 3 4 around it. When it was closed I was looking at 3, so I twisted it all the way around until I saw the 3 again, then around again until I saw the 1. That would be 1-1/2 turns, but the screw feels like it would work itself out if I rode the bike around. Am I somehow doing this simple task incorrectly, or is this normal???