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sorry should've been more clear not thr steering part of it the throttle part. the speed wont stay where you have it. if you let go of the throttle it will twist itself back to shut off the throttle
I looked at the diagram for the 20hp it shows a throttle control plate. could that part be the reason for the throttle not staying in place
...if you let go of the throttle it will twist itself back to shut off the throttle