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@aol.com
Sent: Saturday, September 18, 2010 7:29 AM
To: triumphs@autox.team.net
Cc: 6pack@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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