"1990 225 Johnson. These engines have the timing adjuster on the top of the engine, starboard side, with a turn knob in the front. When you advance the timing to WOT, the spring in the timing device compresses as the rod goes in. When you then let off, the rod then comes back to its original position. Here is my question: Should the rod in the timing unit snap back immediately, or is is it supposed to return to its original position slowly? I have two identical engines--one springs back immediately, the other slowly, like it is hydraulically damped. Which one has a problem?"