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Re: [TR] TR3A Choke Question

To: Randall <TR3driver@ca.rr.com>
Subject: Re: [TR] TR3A Choke Question
From: James Henningsen <trguy75@gmail.com>
Date: Mon, 5 Nov 2018 12:07:24 -0500
Cc: triumphs <Triumphs@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: triumphs@autox.team.net
References: <008a01d47499$5783a2d0$068ae870$@gmail.com> <5B79DF04-10F8-481D-B6D7-C11030B5CA47@albiontechnical.com> <AE846037AD2D44809715F7383DE0A1E3@RYPC>
Randall:
Thanks for the note. John Twist from University Motors and YouTube fame also 
recommended using a heavier oil for better acceleration.  He liked using tranny 
gear oil. 
Jim Henningsen 

Sent from my iPhone

> On Nov 5, 2018, at 11:20 AM, Randall <TR3driver@ca.rr.com> wrote:
> 
> 
>> What kind of oil are you using in the dash pots?  If the oil 
>> is too heavy, it may overdamp the pistons, causing them to 
>> rise too slowly and momentarily weaken the mixture, causing 
>> the hesitation. I find 3 in 1 is about the right weight. 
> 
> Actually, it's just the opposite.  Heavier oil makes the mixture go richer
> right after you open the throttle.  Using oil that is too light can cause a
> "lean bog" (like Jim described).
> 
> The book actually recommends 30 weight for temps between 40F and 70F; 40
> weight above that.  Optimum for you may vary somewhat, depending on engine
> condition and so forth; but I have always found that performance suffers
> with less then 20 weight
> 
>>  The choke cable is hard to pull 
>> out.  Takes two ands
>>> to pull out and then twist to lock.  That's to really get the choke 
>>> levers to move both jets down.  Is this normal or maybe I 
>> need a new choke cable.
> 
> Not normal, but unfortunately rather common.  Did you polish the jets when
> you had the carbs apart?  Originals were supplied polished, but the
> replacements I've seen have been dull.  Dull means a rough finish, which
> greatly increases the friction against the glands.
> 
> The linkage also goes together in an odd way.  If you put it together the
> way it seems it should go, it's harder to operate the choke.  The two
> clevises hang out behind the levers, rather than straddlings them.
> 
> I like to replace the gland sping (inside the jet housing) and the return
> springs during a rebuild, especially if you don't know the full history of
> them.  It's not uncommon for people to stretch the gland spring out a bit,
> in an attempt to get the glands to quit leaking.  The extra pressure
> increases friction, to the extent that often the jets won't return after
> using the choke.  So then they shorten the return spring.  Both actions make
> the choke more difficult to operate!
> 
> -- Randall
> <FIG 28 CARBURETTORS (LINKAGE) reduced.jpg>
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