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From: John Johnson on 8 Jul 2006 18:49
In article <1152370210.817921.293660(a)p79g2000cwp.googlegroups.com>,
"nomorespameventhoughthejapanesespamgivesmeachuckle"
<nousenetspam(a)gmail.com> wrote:

> 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

What are parts 37-40? If one of those is the drain screw, then there's
either an o-ring or washer there (can't tell in the picture). If there's
a washer there, you need to check the washer and seat to make sure that
they're both smooth and flat.

A well-stocked hardware store just might be able to supply appropriate
screws and washers. It varies quite a bit by location and hardware store.

--
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 21:25
<snip>


> What are parts 37-40? If one of those is the drain screw, then there's
> either an o-ring or washer there (can't tell in the picture). If there's
> a washer there, you need to check the washer and seat to make sure that
> they're both smooth and flat.

</snip>

Parts 37-40 attach the carb to the "cross-bar" that holds are the carbs
together as one unit.

Part 12 (just above part 40) is the drain screw.

Interestingly enough gas leaks from parts 37-40 too so I should check
the washer and seat.

From: nomorespameventhoughthejapanesespamgivesmeachuckle on 8 Jul 2006 21:32
<snip>

> 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

</snip>

Very nice Mark! These are very handy; I really appreciate it. I knew
the Yamaha parts catalog existed but never checked it out and therefore
never knew it was as good as it is. I always used the schematics from
bikebandit.com and always disliked the poor quality, but Yamaha's are
sharp. As for ordering the OEM parts, flatoutmotorcycles.com seems to
have what I need when I search by part number. If I would have known
about this earlier I wouldn't have wasted my money on the lame
aftermarket parts; I'm sure there are good parts out there but
definitely not the ones I've received.

From: John Johnson on 9 Jul 2006 00:10
In article <1152408326.164087.59140(a)m79g2000cwm.googlegroups.com>,
"nomorespameventhoughthejapanesespamgivesmeachuckle"
<nousenetspam(a)gmail.com> wrote:

> <snip>
>
>
> > What are parts 37-40? If one of those is the drain screw, then there's
> > either an o-ring or washer there (can't tell in the picture). If there's
> > a washer there, you need to check the washer and seat to make sure that
> > they're both smooth and flat.
>
> </snip>
>
> Parts 37-40 attach the carb to the "cross-bar" that holds are the carbs
> together as one unit.
>
> Part 12 (just above part 40) is the drain screw.

Ah, gotcha.
>
> Interestingly enough gas leaks from parts 37-40 too so I should check
> the washer and seat.

Be very careful about tightening hardware on a carburetor. It's easy (as
you've found with the drain screw) to chew up heads if your screwdriver
isn't a perfect fit.

--
Later,
John

johajohn(a)indianahoosiers.edu

'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
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