Years ago, I had this problem with my TR3a.
Short version was that the butterflies or one of them was not properly
centered, so it was not seating properly.
I centered them and the problem went away.
Your issue seems different but I thought I mention it as it might be useful to
someone.
Joe A
-----Original Message-----
From: John North <johncnorth@gmail.com>
To: Triumph 6 Pack <6pack@autox.team.net>
Sent: Mon, Jun 21, 2010 8:46 pm
Subject: [6pack] Idle increases to 2000 rpm
When I coast to a traffic light...
If I disengage the clutch when the rpms are over 1500, then they do
ot drop, but increase to around 2000 and stay there. Blipping the
hrottle leaves it at 2000 rpm
If I disengage the clutch when the rpms are below 1200 then the idle
rops to the 750 range and everything is normal.
If I am at idle and I throttle up to 1500, and release the throttle,
hen the idle continues to increase up to 2000.
I have disengaged the linkage and operated each carb separately from
dle, but either carb creates the same increase up to 2000.
I switched the pistons thinking when I rebuilt them I somehow switched
hem and they are hanging up, but no effect.
The fast idle appears to be OK, not touching the cam. When the
ngine is running at 2000, I cannot manually move the linkage to get
he idle back to normal, it appears to be at rest. Once at 2000 rpm,
can manually pull down the piston on either carb and the idle
ettles down to 750.
Looked for vacuum leaks around the throttle shafts and gaskets, can't
ind any...
This does not prevent me from driving, but it means coming off gthe
as does not drop the engine to idle - it sticks at 2000 so I am not
lowing as fast as i should and need to brake more. Plus it's
mbarrassing to coast up to a light at 2000 rpms
Any suggestions appreciated.
John North
976 TR6
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