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TR6 Carb Question (Longish)

To: triumphs@autox.team.net
Subject: TR6 Carb Question (Longish)
From: Harrymague@aol.com
Date: Sun, 17 Mar 2002 16:52:37 EST
As I continue to refine my carbs, several more question have come up.  To 
start with, an update from my carb problems from the fall.  I have two carbs 
that were rebuilt by the RSF plus a complete rebuild of my engine.  I am 
having a great problem of getting the car to run smoothly at idle.  With the 
choke out, the car runs pretty smooth and at high RPMs the car is great, but 
coming off the throttle, the car dies.  I thought the problem concerned the 
carbon canister, runon valve, and vaccum.  After thoughly checking these, 
each of which proved to work correctly I started looking at the rebuilt 
carbs.  The problem really occured when the vent line to the left side of the 
carbs was connected.  Using Nelson Riedel Carb Overhaul paper and Haynes 
manual I think I have narrowed the problem to the vent lever with the locking 
screw on the left side of each carb.  Nelson talk about the vent lever 
adjusted to be vertical.  In my research on the carbs, there are no 
references, other than Nelsons', to how this is set nor what exactly what it 
does.  As I play with the setting, it seems that whenever I move the lever 
more to the right, depressing the little plunger, that is when the car will 
die when the car is at idle.  By moving the plunger, via the set screw to the 
left, the car runs well.  Am I defeating the vent lever purposes by moving it 
so far to the left?  Do I have another problem with this vent lever?
My second area that concerns me is the bypass valve and  adusting it.  I have 
the bypass valves that are not connected to the distributor with a vaccuum 
line and has the external adjustment screw.  The literature I have read talk 
about adjusting the valve.  It says to disconnect the vacuum retard line to 
the distributor and plug the line.  This is the line that runs from the base 
of the carb to the distributor and speeds up the RPM by 500 rpm or so.  By 
adjusting the bypass valve to get it to "float", you should be able to get 
the rpm to increase, but I can't.  Has anybody mess with these valves and 
have any other suggestions???
Thanks in advance for any help.
Harry Mague
Beavercreek, OH
74 TR6
CF16623

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