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It does. I've been running my '3A for 15 years and always used 20 weight.
Will switch to 30 now. Difference not likely to be huge, but after all this
time I'll likely notice it...that is, next spring.
Terry
New Hampshire
> On November 5, 2018 at 6:41 PM David P <frogeye@porterscustom.com> wrote:
>
>
> Randall is quite correct.. if the piston rises too quickly air flow
> (velocity) across the jet head is lost/decreased and the mixture goes lean.
> The dampers (of which there are different sizes-BTW) at as a defacto
> accelerator pump by keeping the piston from rising too quickly.. Hope this
> info clears up some SU mystery.
>
>
> On 11/5/2018 9:20 AM, Randall 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
> >
> >
> >
> > ** triumphs@autox.team.net mailto:triumphs@autox.team.net **
> >
> > Donate: http://www.team.net/donate.html
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> >
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> >
> > >
> --
> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My
> World go here: http://WWW.PORTERBIKES.COM/
>
>
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<meta charset=3D"UTF-8">
</head><body><p style=3D"font-size: 12pt; font-family: helvetica, arial, sa=
ns-serif; color: rgb(51, 51, 51);">It does.  I've been running my =
'3A for 15 years and always used 20 weight.  Will switch to 30 now=
.  Difference not likely to be huge, but after all this time I'll =
likely notice it...that is, next spring.<br></p><p style=3D"font-size:12pt;=
font-family:helvetica,arial,sans-serif;color:#333333;" class=3D"default-sty=
le">Terry</p><p style=3D"font-size:12pt;font-family:helvetica,arial,sans-se=
rif;color:#333333;" class=3D"default-style">New Hampshire<br></p><blockquot=
e type=3D"cite">On November 5, 2018 at 6:41 PM David P <frogeye@porters=
custom.com> wrote: <br> <br><p>Randall is quite correct.. if the piston=
rises too quickly air flow (velocity) across the jet head is lost/decrease=
d and the mixture goes lean. The dampers (of which there are different size=
s-BTW) at as a defacto accelerator pump by keeping the piston from rising t=
oo quickly.. Hope this info clears up some SU mystery.<br></p><br><div clas=
s=3D"ox-48e6f36f64-moz-cite-prefix">On 11/5/2018 9:20 AM, Randall wrote: <b=
r></div><blockquote type=3D"cite"><pre> </pre><blockquote type=3D"cite=
"><pre>What kind of oil are you using in the dash pots? If the oil=20
is too heavy, it may overdamp the pistons, causing them to=20
rise too slowly and momentarily weaken the mixture, causing=20
the hesitation. I find 3 in 1 is about the right weight.=20
</pre></blockquote><pre>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
</pre><blockquote type=3D"cite"><pre> The choke cable is hard to pull=20
out. Takes two ands
</pre><blockquote type=3D"cite"><pre>to pull out and then twist to lock. T=
hat's to really get the choke=20
levers to move both jets down. Is this normal or maybe I=20
</pre></blockquote><pre>need a new choke cable.
</pre></blockquote><pre>Not normal, but unfortunately rather common. Did y=
ou 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, whic=
h
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 b=
it,
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 afte=
r
using the choke. So then they shorten the return spring. Both actions mak=
e
the choke more difficult to operate!
-- Randall
</pre><br> <br><pre>** <a class=3D"ox-48e6f36f64-moz-txt-link-abbreviated" =
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</a>
</pre></blockquote><br><pre class=3D"ox-48e6f36f64-moz-signature">--=20
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My Wo=
rld go here: <a class=3D"ox-48e6f36f64-moz-txt-link-abbreviated" href=3D"ht=
tp://WWW.PORTERBIKES.COM/">WWW.PORTERBIKES.COM/</a><br></pre><br><table sty=
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