Hi Norm,
As we know if the motor only runs with the choke on, the mixtures must be incorrect with the choke off.
I'd be making sure the original air filter and filter housing are installed and someone hasn't installed the wrong
sized carby.
Sometimes I've had carbs where the fuel pipe connector is rusted inside and I've had to clean it out with a drill bit and
wire so the fuel bowl gets enough fuel.
If there's no air leaks and the carby is perfectly cleaned and adjusted and with no fuel supply problems you could
open the main jet up a little.
Cheers
Max.
