[6pack] [TR] TR6 Mistery Miss

[Sally or Dick Taylor]

Darrell---A disconnected vacuum line (the one that goes from the bottom of the rear carb to the distributor vacuum retard) shouldn't cause the"white plug" you saw. This particular vacuum port on the carb doesn't do much of anything once the butterfly (throttle plate) is opened past the engine idle speed.

If the other two sparkplugs fed by the rear carb appeared to be of normal coloring, I'd suspect the cause of the white plug to be more a sign of a lean mixture for another reason. (Intake manifold gasket failure, or loose stud nut)? Put a socket on these nuts to see if they can be drawn up. Check this plug again after you've put some miles on the engine.

If you haven't already done so, you'll want to cap the vacuum port on the bottom of this carb. Just so it doesn't suck in dirt.

Dick


-----Original Message-----
From: TR250Driver at aol.com
Sent: Saturday, September 18, 2010 7:29 AM
To: triumphs at autox.team.net
Cc: 6pack at autox.team.net
Subject: Re: [6pack] [TR] TR6 Mistery Miss

Is it possible that a disconnected vacuum retard line @ the dizzy could  
cause the bright white #6 plug.  Noticed that when I pulled the plugs the  
first time.  Not sure if I did it then or it was like that for a  while. This 
line goes to the rear carb.
 
Tested the intake manifold by spraying starter fluid while the Six was at  
idle.  No detectable increase in idle at all.  Afterwards I pulled #6  and 
it was no longer bright white but brown instead???
 
Darrell
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