BTW: The screw on top of the carb is NOT a needle screw. It merely prevents the carb barrel from falling out...

The HS needle is the knob.

The LS needle is on the opposite side of the knob as is within the throttle arm circle.

Turn the LS needle out until the head of the screw is almost level with the circle.

That will be an overly rich LS setting but you should get the engine to start to crank over that way.



The manual also says something that is very confusing to newbies....

"The low speed setting is controlled mainly by the idle stop and not the idle needle, which is only used to set the mixture."

Some people read this to mean that the idle stop ( the screw on top of the carb ) is used to deal with the idle, that is NOT SO.

The top screw controls how far the throttle barrel will close, if yours does not close FULLY, then loosen the top screw slightly until it does.

The screw opposite the knob is the idle mixture screw, which must be set to permit flow using the "blow" method.