Here's the old Super Tigre low speed needle method. It does take 3 hands or some help unless you have the throttle hooked up.

1. Hook a 8-10" long piece of fuel tubing up to the carb nipple
2. Screw the low speed needle closed.
3. Put a T-pin in the carb throat and pull the carb closed. This leaves a very small gap, approximately idle size.
4. While holding the carb lever to keep the T-pin captured. blow into the fuel tubing and slowly open the low end needle.
5. Put your ear down near the carb and when you hear the first hiss of air, stop opening the carb low end needle

That's it, low end set.

As for the high end, open that needle 3 turns and crank. Leave the glow ignitor attached and rev to full power and slowly lean out the mixture. Leaving the battery attached to the plug insures that if 3 turns is too much, the engine won't quit rich.

Once you get the top end set, go back and check the low end.

Your engine more than likely has old oil congealed on the inside of the carb, reducing the clearances. As you run it more, this will wash away and you'll need to lean out both hi & lo ends somewhat.