I see two things that keep the throttle in the position you wish it to be in.
1. Behind the tube leading from the air cleaner to the carb there is a spring connected to the linkage behind the fresh air . This spring has a way of breaking and/or losing its tension.
2. In the same area as 1 above, within the linkage, there is a tension adjusting nut with a self-locking feature (split nut). This nut applies tension to a star shaped washer about 2 inches in diameter laying over a leather washer. Try to tighten this self-locking nut a few turns. If this doesn't work, think about replacing the leather washer.
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