Hi, Listers--
My next door neighbor recently bought a 74 TR6 and has been having
considerable trouble with the engine breaking up. At times it runs smoothly
and at others the only way he can make it back home is with the choke out.
(That would seem to indicate it's running lean, no? In using the
screwdriver method to obtain the correct mixture, the RPMs dropped whenever
we raised the damper on either carb. We were unable to adjust either carb
to make the RPMs hold steady or increase.) The needles look perfect and
were probably installed 3,000 miles ago by the PO. My neighbor has replaced
some of the vacuum hoses and found a few leaks but that didn't seem to
correct the problem. The timing is set to 4 degrees ATDC with the
distributor vacuum advance hose removed and plugged. However, there doesn't
seem to be much vacuum on that small hose and when we re-attach it to the
distributor, the RPMs don't change. He is currently rebuilding the
carburetors and I was wondering what we should be looking for. The floats
appear not to be leaking and moving freely. Is there any way to discern
throttle spindle wear with the carbs apart? My neighbor (yes, this is a
real person--not me) is very meticulous and has set the valves and done all
of the ignition work carefully to spec. We were starting to suspect that
the timing chain may have jumped, but sometimes, the damn thing runs
perfectly while we're tuning it. We shut it off, put the new air cleaners
back on, start it up and it's rough as a cob.
Any thoughts would be appreciated.
Ian
CF57345
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>From: "Graham Stretch" <technical@iwnet.screaming.net>
>To: "List Triumph" <triumphs@autox.team.net>
>Date: Sun, Mar 12, 2000, 5:53 AM
>
>
>Hi Virgil
>The cause of your stalling will almost certainly be that the spindles are
>worn and when you return to idle the butterflies don't land in the same
>place twice, new spindles in your carb bodies will probably cure the problem
>as generally the bodies don't wear a great deal. Whether to go for Webers is
>mainly personal preference, I would suggest that you may be able to learn to
>tune Strombergs yourself if you read the manual Webers are more difficult
>IMO. Strombergs should stay in tune for about a year, dependant on mileage
>and condition, the more wear in the spindles the less time they seem to
>remain in tune! Personally I would stay with the Strombergs as a mater of
>preference and authenticity.
>
>Graham.
>Ps never think of a question as dumb, if you don't ask you won't learn
>anything!
>
>
>
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