Russ,
It would be good if you provided a history of your bike. It makes a difference to the experts who have the knowledge to advise you.
The baseline for the air screw is 1-1/2 turns out. I can tell you that, behind the air screw is a tiny jet that measures .016". It must be clear for the bike to start and idle properly. A #78 drill bit is just the thing to clear that jet. Some recommend an old guitar string or a bread tie but the drill bit is better. You can order them online for cheap.
There are also two tiny holes at the bottom of the throat of the carb on either side of where the slide contacts the bottom and toward the intake side. These must also be clear.
Go to this link to learn all about your carb.
http://www.jba.bc.ca/Bushmans Carb Tuning.html
You could have other issues as well such as a warped float bowl and others but my money is on a clogged pilot jet.
Henry
It would be good if you provided a history of your bike. It makes a difference to the experts who have the knowledge to advise you.
The baseline for the air screw is 1-1/2 turns out. I can tell you that, behind the air screw is a tiny jet that measures .016". It must be clear for the bike to start and idle properly. A #78 drill bit is just the thing to clear that jet. Some recommend an old guitar string or a bread tie but the drill bit is better. You can order them online for cheap.
There are also two tiny holes at the bottom of the throat of the carb on either side of where the slide contacts the bottom and toward the intake side. These must also be clear.
Go to this link to learn all about your carb.
http://www.jba.bc.ca/Bushmans Carb Tuning.html
You could have other issues as well such as a warped float bowl and others but my money is on a clogged pilot jet.
Henry