you can see the tiny hole in the casting in line with the brass tube in this pix.
the idle hole in the brass tube is smaller then the others you can see.
there is some gearing via the pedals to help start, different then a pull start.
the three motor mount bolt holes are slotted, you have to remove the rivets from the rear one to be able to adjust the belt.
chug-chug-chug sounds good, not slipping, but may be too slow, i roll start rather then just pedal (as a good rule)
i omitted top end compression as a cause, but it would have to be really non-existant to not pull fuel.