1.5 w.c. output pressure is correct, even at 1 w.c. it should run
First check inside the vaporizer and make sure it is not gummed up, clean it out of necessary.
then...
i would go to the mixer/carb and check the diaphragm and make sure it is not torn or leaking by the bullet button seat.
And of course check for any vacuum leaks too.
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