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From: nomorespameventhoughthejapanesespamgivesmeachuckle on 7 Jul 2006 22:43

John Johnson wrote:
> In article <1152299700.155552.152440(a)h48g2000cwc.googlegroups.com>,
> "Rob Kleinschmidt" <Rkleinsch1216128(a)aol.com> wrote:
>
> > nomorespameventhoughthejapanesespamgivesmeachuckle wrote:
> > > If I don't understand how these carbs work correctly (as No No No!!!)
> > > probably indicates, can someone enlighten me?
> > >
> > > I looked all over the net and through Google Images and I couldn't find
> > > a nice diagram that explains what's going on inside.
>
>
> http://www.powroll.com/tech_specs_jetting101.htm
>
> This site claims to be an introduction to carburetors. I only glanced
> over it and it seemed ok, but I'm not sure how well it will answer your
> questions. At the very least, it should allow you to ask more precise
> questions here.
>
> Also check out the wikipedia entry on "carburetor."
>
> > > The way I
> > > understand it is the way in which I wrote about before.
> >
> > Sombody correct me if I misstate anything please.
> >
> > Bikes with carbs typically do not have fuel pumps.
> Well, mine's got both ('94 VFR750), but yeah. ;-)
>
> > Without a fuel pump, bike carbs are fed by gravity.
>
> [snip]
> >
> > When the float bowl is full, the floats should have enough
> > bouyancy to press the float valves closed against the weight
> > (pressure) of the column of gasoline.
> >
> What the floats do is press a tapered needle with an o-ring near its tip
> into the fuel supply port, sealing it. In the diagram at the powroll.com
> site, it's #34.
>
> > If the float bowl is overflowing it's because either the floats
> > or the float valves aren't doing their job and probably need
> > replacement.
>
> --
> Later,
> John
>
> johajohn(a)indianahoosiers.edu
>
> 'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.

Thanks for the link; it explained everything I thought I already know
which is why I am confused when I'm told that I'm wrong... maybe it's
just semantics. The way I describe it is that when the fuel level is
low in the bowl, the floats lower which allows the valve needle to
unseats itself from the valve seat and that allows fuel in. The carb
"asks" gravity, "Can I have some more fuel please?" Gravity responds,
"Yes you may." Where am I going wrong here?

From: nomorespameventhoughthejapanesespamgivesmeachuckle on 7 Jul 2006 22:50
Here's an update:

I took off the carbs and redid the tangs as best as I could... things
seem a bit better now. Only the left-most carb leaks now and it's only
a tiny bit. The strangest thing is (and maybe it's not to some) it
leaks (and has always leaked) through the float bowl drain screw but
NOT out of the overflow. Maybe the drain screw is not tight enough...
unfortunately the screw is very soft and the head is just about
stripped so I don't want to torque it any tighter; I'd rather not mess
around with it until I take it out one final time to replace the
screws.

Unfortunately the petcock still leaks. After taking it apart and
redoing the grommet and diaphragm I got it to go only drip... drip...
drip. I'll end up either taking it in to a shop and having them look
at it and if they can't fix it I'll order a new one. It seems that
aftermarket parts are very poorly made as the original plunger looks
much higher in quality than this aftermarket K & M plunger. Ditto for
carb rebuild kits... I need to find a place that does OEM and only
OEM.

From: John Johnson on 7 Jul 2006 23:56
In article <1152326629.230196.241700(a)m79g2000cwm.googlegroups.com>,
"nomorespameventhoughthejapanesespamgivesmeachuckle"
<nousenetspam(a)gmail.com> wrote:

> John Johnson wrote:
> > In article <1152299700.155552.152440(a)h48g2000cwc.googlegroups.com>,
> > "Rob Kleinschmidt" <Rkleinsch1216128(a)aol.com> wrote:
> >
> > > nomorespameventhoughthejapanesespamgivesmeachuckle wrote:
> > > > If I don't understand how these carbs work correctly (as No No No!!!)
> > > > probably indicates, can someone enlighten me?
> > > >
> > > > I looked all over the net and through Google Images and I couldn't find
> > > > a nice diagram that explains what's going on inside.
> >
> >
> > http://www.powroll.com/tech_specs_jetting101.htm
> >
> > This site claims to be an introduction to carburetors. I only glanced
> > over it and it seemed ok, but I'm not sure how well it will answer your
> > questions. At the very least, it should allow you to ask more precise
> > questions here.
> >
> > Also check out the wikipedia entry on "carburetor."
> >
> > > > The way I
> > > > understand it is the way in which I wrote about before.
> > >
> > > Sombody correct me if I misstate anything please.
> > >
> > > Bikes with carbs typically do not have fuel pumps.
> > Well, mine's got both ('94 VFR750), but yeah. ;-)
> >
> > > Without a fuel pump, bike carbs are fed by gravity.
> >
> > [snip]
> > >
> > > When the float bowl is full, the floats should have enough
> > > bouyancy to press the float valves closed against the weight
> > > (pressure) of the column of gasoline.
> > >
> > What the floats do is press a tapered needle with an o-ring near its tip
> > into the fuel supply port, sealing it. In the diagram at the powroll.com
> > site, it's #34.
> >
> > > If the float bowl is overflowing it's because either the floats
> > > or the float valves aren't doing their job and probably need
> > > replacement.
> >
> > --
> > Later,
> > John
> >
> > johajohn(a)indianahoosiers.edu
> >
> > 'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
>
> Thanks for the link; it explained everything I thought I already know
> which is why I am confused when I'm told that I'm wrong... maybe it's
> just semantics. The way I describe it is that when the fuel level is
> low in the bowl, the floats lower which allows the valve needle to
> unseats itself from the valve seat and that allows fuel in. The carb
> "asks" gravity, "Can I have some more fuel please?" Gravity responds,
> "Yes you may." Where am I going wrong here?

The point of that exchange was that properly-adjusted valve needles will
seal the carburetor against the gravity-feed of gasoline, no matter
whether the petcock is open or not.

You've got two problems:
1. a leaky petcock. Based on your next post, it seems like you've got
this problem under control. At the very least, your plan for dealing
with it is sound.

2. A leaky carb. Now that we know that it's leaking out the drain screw
rather than the overflow, the advice is fairly straightforward: replace
the screw _and_ the o-ring. Again, it looks like you've got that one
under control.

--
Later,
John

johajohn(a)indianahoosiers.edu

'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
From: nomorespameventhoughthejapanesespamgivesmeachuckle on 8 Jul 2006 10:50

John Johnson wrote:
> In article <1152326629.230196.241700(a)m79g2000cwm.googlegroups.com>,
> "nomorespameventhoughthejapanesespamgivesmeachuckle"
> <nousenetspam(a)gmail.com> wrote:
>
> > John Johnson wrote:
> > > In article <1152299700.155552.152440(a)h48g2000cwc.googlegroups.com>,
> > > "Rob Kleinschmidt" <Rkleinsch1216128(a)aol.com> wrote:
> > >
> > > > nomorespameventhoughthejapanesespamgivesmeachuckle wrote:
> > > > > If I don't understand how these carbs work correctly (as No No No!!!)
> > > > > probably indicates, can someone enlighten me?
> > > > >
> > > > > I looked all over the net and through Google Images and I couldn't find
> > > > > a nice diagram that explains what's going on inside.
> > >
> > >
> > > http://www.powroll.com/tech_specs_jetting101.htm
> > >
> > > This site claims to be an introduction to carburetors. I only glanced
> > > over it and it seemed ok, but I'm not sure how well it will answer your
> > > questions. At the very least, it should allow you to ask more precise
> > > questions here.
> > >
> > > Also check out the wikipedia entry on "carburetor."
> > >
> > > > > The way I
> > > > > understand it is the way in which I wrote about before.
> > > >
> > > > Sombody correct me if I misstate anything please.
> > > >
> > > > Bikes with carbs typically do not have fuel pumps.
> > > Well, mine's got both ('94 VFR750), but yeah. ;-)
> > >
> > > > Without a fuel pump, bike carbs are fed by gravity.
> > >
> > > [snip]
> > > >
> > > > When the float bowl is full, the floats should have enough
> > > > bouyancy to press the float valves closed against the weight
> > > > (pressure) of the column of gasoline.
> > > >
> > > What the floats do is press a tapered needle with an o-ring near its tip
> > > into the fuel supply port, sealing it. In the diagram at the powroll.com
> > > site, it's #34.
> > >
> > > > If the float bowl is overflowing it's because either the floats
> > > > or the float valves aren't doing their job and probably need
> > > > replacement.
> > >
> > > --
> > > Later,
> > > John
> > >
> > > johajohn(a)indianahoosiers.edu
> > >
> > > 'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
> >
> > Thanks for the link; it explained everything I thought I already know
> > which is why I am confused when I'm told that I'm wrong... maybe it's
> > just semantics. The way I describe it is that when the fuel level is
> > low in the bowl, the floats lower which allows the valve needle to
> > unseats itself from the valve seat and that allows fuel in. The carb
> > "asks" gravity, "Can I have some more fuel please?" Gravity responds,
> > "Yes you may." Where am I going wrong here?
>
> The point of that exchange was that properly-adjusted valve needles will
> seal the carburetor against the gravity-feed of gasoline, no matter
> whether the petcock is open or not.
>
> You've got two problems:
> 1. a leaky petcock. Based on your next post, it seems like you've got
> this problem under control. At the very least, your plan for dealing
> with it is sound.
>
> 2. A leaky carb. Now that we know that it's leaking out the drain screw
> rather than the overflow, the advice is fairly straightforward: replace
> the screw _and_ the o-ring. Again, it looks like you've got that one
> under control.
>
> --
> Later,
> John
>
> johajohn(a)indianahoosiers.edu
>
> 'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.

That's my conclusion as well. Oddly enough my carbs don't have any
o-rings around the drain screw... If you look at a schematic for my
carbs there is none listed.

http://www.bikebandit.com/partsbandit/showschematic~dept_id~657336.asp

Does anyone know where I can get OEM parts for old UJM's (other than
bikebandit.com and oldbikebarn.com)?

From: Mark Olson on 8 Jul 2006 18:09
nomorespameventhoughthejapanesespamgivesmeachuckle wrote:

> Does anyone know where I can get OEM parts for old UJM's (other than
> bikebandit.com and oldbikebarn.com)?

It depends what parts, and what brand. There is no one dealership
that is the cheapest for all brands.

I recommend for Honda: http://www.servicehonda.com, they are the cheapest
and have good service, I have used them multiple times, and have had
occasion to return things and they are easy to deal with. They have the
best online fiche application I have ever seen, it is the same one that
the Honda dealerships use.

For Kawasaki I have found none better than Ron Ayers, they have
*some* Kawasaki fiche drawings, but all Kawasaki USA fiches are
available at http://www.buykawasaki.com:

http://www.ronayers.com/browseparts.cfm?searchstring=92055-1053

For Yamaha, Flatout Motorcycles:

http://www.flatoutmotorcycles.com/fiche_select.asp?mfg=Yamaha&partnumber=2J2-25444-10-00

Note that Flatout does not have the parts fiche online for all
Yamaha models, but you can get the part numbers from the fiches
on the Yamaha USA site:

http://www.yamaha-motor.com/sport/parts/home.aspx

For Suzuki, I have also used Ron Ayers but other folks like Oneida
Suzuki in Oneida NY.

http://www.oneidasuzuki.com/

There are lots of third party parts suppliers like Old Bike Barn,
Cycle Re-Cycle II, etc. which I have also bought from, but in
general they only supply certain popular parts like carb kits
and brake master cylinder repair kits, etc. But I did get a
great deal on an aftermarket air cleaner for my CM400T from
Cycle Re-Cycle II so check them out, too.

--
'01 SV650S '99 EX250-F13 '98 ZG1000A-13 '81 CM400T
OMF #7

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