Jim Ketcham 
  
  
 
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   The "throttle lever return springs" number 16 in parts manual is the only return spring I have on my JHs.  The throttles snap close easily with quite a bit of force.  If throttles do not snap close easily you may have misaligned throttle plates, bent throttle shaft, bad bearings... I will mail you some pics of my setup if you pm me with your email address. 
 
Although I did see a setup like subwoofer refers to I believe it was added by the owner and I can't find any reference to one in the parts manual.  Maybe Tim Engels can comment. 
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