they do need lube...but,when you move the lever does it move the cable and throttle grip back?might need to adjust cable or maybe cable is binding.
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My testing is as follows,
Set the lever back to closed, where its supposed to be. I turn the throttle on the handle bar a quarter turn and let go. It flips back to normal resting position but the lever gets stuck as showed in the picture below.
As for your questions. As I manually push the lever back against the plate the throttle on the handle bar doesn't move since it has already snapped back to normal position.
I checked all parts of the cable for binding but it all moves freely with no obstructions.