RE: throttle arm Become difficult to move dz160
I experienced the same problem with a YS 175 and we were using the YS mount. The carb housing is the main support for back of the engine and the rear dampener bolts to it. When the engine get hot it make the carb housing warp and causes the barrel to bind. We switched back to the Hyde mount which uses the bolt lugs on the side of the engine and our problems went away. I'm sure there is a solution so you can use the YS mount because a lot of people use it and it's a really nice mount, but you have got to have the correct torque on the carb housing and plenty of airflow for cooling. This is just my 2 cents and my experience with this problem.
Larry