Set the timing and make sure the ignition poins are clean and properly gapped, if it still has points. Inspect the points for metal transfer and if present polish with emery cloth or replace points and condenser and gap properly before you set timing. Bad condenser causes the metal transfer.
Now adjust the mixture screws so you have the highest RPM, go both lean and rich to find it. Then lean them out until your peak RPM drops by 50. For example it's 750 then adjust the mixture screws leaner until it is 700. In most cases you can adjust the accelerator pump volume but I would not worry about that unless you find flat spots or stumbling on acceleration.
Enjoy the ride.
regards
Mech
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