Couple of Trouble shooting items for 1987 zilla

• Couple of Trouble shooting items for 1987 zilla
  Posted by Rem28ga on 12 Jul, 2013 17:14
• Hi All,
  
  What does it mean if my 1987 zilla takes a bit to idle back down after bumping the throttle. It seems to take a long time (15 seconds or so maybe a little longer) to come back down.  Also
  
  I seem to be getting coolant out of the weep hole on the bottom of the case under the water pump housing.  What are the tell tell signs of a bad water pump or seals? I did not replace it when I put the bike together. 
  
  Thanks for the insight. Just trying to get punch list items figured out before I run it down to the dunes and dyno it.
  
  
  
  
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• #1 Reply
  Posted by MotorGeek - Jerry Hall on 12 Jul, 2013 17:23
• The sealing washer under the water pump impeller bolt is allowing coolant to leak between the impeller and sealing washer on 90% of the leaking water pumps on the LT 500s.  The water pump seal seldom give problems.
  
  The water pump shaft cannot protrude above the surface of the impeller where the sealing washer seals against.  If the shaft protrudes above the surface, replace the impeller or grind about .020" off the end of the shaft.
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• #2 Reply
  Posted by Q2W on 15 Jul, 2013 07:58
• Quote from: Rem28ga on 12 Jul, 2013 17:14

  Hi All,
  
  What does it mean if my 1987 zilla takes a bit to idle back down after bumping the throttle. It seems to take a long time (15 seconds or so maybe a little longer) to come back down.
  
  

  
  Slide height set incorrectly or slight air leak.
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• #3 Reply
  Posted by Rem28ga on 20 Jul, 2013 16:44
• Thanks for the info guys.
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